SLASEA5C March   2016  – May 2017 TAS5753MD

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Characteristics
    5. 6.5  Electrical Characteristics
    6. 6.6  Speaker Amplifier Characteristics in All Modes
    7. 6.7  Speaker Amplifier Characteristics in Stereo Bridge Tied Load (BTL) Mode
    8. 6.8  Speaker Amplifier Characteristics in Stereo Post-Filter Parallel Bridge Tied Load (Post-Filter PBTL) Mode
    9. 6.9  Headphone Amplifier and Line Driver Characteristics
    10. 6.10 Protection Circuitry Characteristics
    11. 6.11 I²C Interface Timing Requirements
    12. 6.12 Serial Audio Port Timing Requirements
    13. 6.13 Typical Electrical Power Consumption
    14. 6.14 Typical Characteristics
      1. 6.14.1 Typical Characteristics - BTL Mode
      2. 6.14.2 Typical Characteristics - PBTL Mode
      3. 6.14.3 Typical Characteristics - Headphone Amplifier
      4. 6.14.4 Typical Characteristics - Line Driver
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Audio Signal Processing Overview
    4. 7.4 Feature Description
      1. 7.4.1 Clock, Autodetection, and PLL
      2. 7.4.2 PWM Section
      3. 7.4.3 PWM Level Meter
      4. 7.4.4 Automatic Gain Limiter (AGL)
      5. 7.4.5 Headphone/Line Amplifier
      6. 7.4.6 Fault Indication
      7. 7.4.7 SSTIMER Pin Functionality
      8. 7.4.8 Device Protection System
        1. 7.4.8.1 Overcurrent (OC) Protection With Current Limiting
        2. 7.4.8.2 Overtemperature Protection
        3. 7.4.8.3 Undervoltage Protection (UVP) and Power-On Reset (POR)
    5. 7.5 Device Functional Modes
      1. 7.5.1 Serial Audio Port Operating Modes
      2. 7.5.2 Communication Port Operating Modes
      3. 7.5.3 Speaker Amplifier Modes
        1. 7.5.3.1 Stereo Mode
        2. 7.5.3.2 Mono Mode
    6. 7.6 Programming
      1. 7.6.1 I²C Serial Control Interface
        1. 7.6.1.1 General I²C Operation
        2. 7.6.1.2 I²C Slave Address
          1. 7.6.1.2.1 I²C Device Address Change Procedure
        3. 7.6.1.3 Single- and Multiple-Byte Transfers
        4. 7.6.1.4 Single-Byte Write
        5. 7.6.1.5 Multiple-Byte Write
        6. 7.6.1.6 Single-Byte Read
        7. 7.6.1.7 Multiple-Byte Read
      2. 7.6.2 Serial Interface Control and Timing
        1. 7.6.2.1 Serial Data Interface
        2. 7.6.2.2 I²S Timing
        3. 7.6.2.3 Left-Justified
        4. 7.6.2.4 Right-Justified
      3. 7.6.3 26-Bit 3.23 Number Format
    7. 7.7 Register Maps
      1. 7.7.1 Register Summary
      2. 7.7.2 Detailed Register Descriptions
        1. 7.7.2.1  Clock Control Register (0x00)
        2. 7.7.2.2  Device ID Register (0x01)
        3. 7.7.2.3  Error Status Register (0x02)
        4. 7.7.2.4  System Control Register 1 (0x03)
        5. 7.7.2.5  Serial Data Interface Register (0x04)
        6. 7.7.2.6  System Control Register 2 (0x05)
        7. 7.7.2.7  Soft Mute Register (0x06)
        8. 7.7.2.8  Volume Registers (0x07, 0x08, 0x09)
        9. 7.7.2.9  Volume Configuration Register (0x0E)
        10. 7.7.2.10 Modulation Limit Register (0x10)
        11. 7.7.2.11 Interchannel Delay Registers (0x11, 0x12, 0x13, and 0x14)
        12. 7.7.2.12 PWM Shutdown Group Register (0x19)
        13. 7.7.2.13 Start/Stop Period Register (0x1A)
        14. 7.7.2.14 Oscillator Trim Register (0x1B)
        15. 7.7.2.15 BKND_ERR Register (0x1C)
        16. 7.7.2.16 Input Multiplexer Register (0x20)
        17. 7.7.2.17 PWM Output MUX Register (0x25)
        18. 7.7.2.18 AGL Control Register (0x46)
        19. 7.7.2.19 PWM Switching Rate Control Register (0x4F)
        20. 7.7.2.20 Bank Switch and EQ Control (0x50)
  8. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 External Component Selection Criteria
        1. 8.1.1.1 Component Selection Impact on Board Layout, Component Placement, and Trace Routing
        2. 8.1.1.2 Amplifier Output Filtering
    2. 8.2 Typical Applications
      1. 8.2.1 Stereo Bridge Tied Load Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Component Selection and Hardware Connections
          2. 8.2.1.2.2 Control and Software Integration
          3. 8.2.1.2.3 I²C Pullup Resistors
          4. 8.2.1.2.4 Digital I/O Connectivity
          5. 8.2.1.2.5 Recommended Startup and Shutdown Procedures
            1. 8.2.1.2.5.1 Start-Up Sequence
            2. 8.2.1.2.5.2 Normal Operation
            3. 8.2.1.2.5.3 Shutdown Sequence
            4. 8.2.1.2.5.4 Power-Down Sequence
        3. 8.2.1.3 Application Performance Plots
      2. 8.2.2 Mono Parallel Bridge Tied Load Application
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Performance Plots
      3. 8.2.3 Stereo BTL Configuration with Headphone and Line Driver Amplifier Application
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Performance Plots
      4. 8.2.4 Mono Parallel Bridge-Tied Load Configuration with Headphone and Line Driver Amplifier
        1. 8.2.4.1 Design Requirements
        2. 8.2.4.2 Detailed Design Procedure
        3. 8.2.4.3 Application Performance Plots
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Decoupling Capacitors
      2. 10.1.2 Thermal Performance and Grounding
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary

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Detailed Description

Overview

The TAS5753MD device is an efficient, digital-input audio amplifier for driving stereo speakers configured as a bridge tied load (BTL). In parallel bridge tied load (PBTL) in can produce higher power by driving the parallel outputs into a single lower impedance load. One serial data input allows processing of up to two discrete audio channels and seamless integration to most digital audio processors and MPEG decoders. The device accepts a wide range of input data and data rates. A fully programmable data path routes these channels to the internal speaker drivers.

The TAS5753MD device is a slave-only device receiving all clocks from external sources. The TAS5753MD device operates with a PWM carrier between a 384-kHz switching rate and a 288-kHz switching rate, depending on the input sample rate. Over-sampling combined with a fourth-order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.

Functional Block Diagram

TAS5753MD fbd_slasea5_tas8733.gif
Figure 38. TAS5753MD Functional Block Diagram

Audio Signal Processing Overview

TAS5753MD audio_signal_overview_slasec1.gif
Figure 39. TAS5753MD Audio Process Flow

Feature Description

Clock, Autodetection, and PLL

The TAS5753MD device is an I²S slave device. The TAS5753MD device accepts MCLK, SCLK, and LRCK. The digital audio processor (DAP) supports all the sample rates and MCLK rates that are defined in the Clock Control Register.

The TAS5753MD device checks to verify that SCLK is a specific value of 32 fS, 48 fS, or 64 fS. The DAP only supports a 1 × fS LRCK. The timing relationship of these clocks to SDIN is shown in subsequent sections. The clock section uses MCLK or the internal oscillator clock (when MCLK is unstable, out of range, or absent) to produce the internal clock (DCLK) running at 512 times the PWM switching frequency.

The DAP can autodetect and set the internal clock control logic to the appropriate settings for all supported clock rates as defined in the Clock Control Register.

The TAS5753MD device has robust clock error handling that uses the built-in trimmed oscillator clock to quickly detect changes/errors. Once the system detects a clock change/error, the system mutes the audio (through a single-step mute) and then forces PLL to limp using the internal oscillator as a reference clock. Once the clocks are stable, the system autodetects the new rate and reverts to normal operation. During this process, the default volume is restored in a single step (also called hard unmute). The ramp process can be programmed to ramp back slowly (also called soft unmute) as defined in the Volume Configuration Register.

PWM Section

The TAS5753MD DAP device uses noise-shaping and customized nonlinear correction algorithms to achieve high power efficiency and high-performance digital audio reproduction. The DAP uses a fourth-order noise shaper to increase dynamic range and SNR in the audio band. The PWM section accepts 24-bit PCM data from the DAP and outputs two BTL PWM audio output channels.

The PWM section has individual-channel dc-blocking filters that can be enabled and disabled. The filter cutoff frequency is less than 1 Hz.

The PWM section has an adjustable maximum modulation limit of 93.8% to 99.2%. For PVDD > 18 V the modulation index must be limited to 96.1% for safe and reliable operation.

PWM Level Meter

The structure in Figure 40 shows the PWM level meter that can be used to study the power profile.

TAS5753MD B0396-01_LOS670.gif Figure 40. PWM Level Meter Structure

Automatic Gain Limiter (AGL)

The AGL scheme has three AGL blocks. One ganged AGL exists for the high-band left/right channels, the mid-band left/right channels, and the low-band left/right channels.

The AGL input/output diagram is shown in Figure 41.

TAS5753MD M0091-04_LOS670.gif
Professional-quality dynamic range compression automatically adjusts volume to flatten volume level.
 • Each AGL has adjustable threshold levels.
 • Programmable attack and decay time constants
 • Transparent compression: compressors can attack fast enough to avoid apparent clipping before engaging,
    and decay times can be set slow enough to avoid pumping.
Figure 41. Automatic Gain Limiter
TAS5753MD agl_structure_slase77.gif
T = 9.23 format, all other AGL coefficients are 3.23 format
Figure 42. AGL Structure

Table 2. AGL Structure

α, ω T αa, ωa / αd, ωd
AGL 1 0x3B 0x40 0x3C
AGL 2 0x3E 0x43 0x3F
AGL 3 0x47 0x41 0x42
AGL 4 0x48 0x44 0x45

Headphone/Line Amplifier

An integrated ground centered DirectPath combination headphone amplifier and line driver is integrated in the TAS5729MD. This headphone/line amplifier can be used independently from the device speaker amplifier modes, with analog single-ended inputs DR_INA and DR_INB, linked to the respective analog outputs DR_OUTA, and DR_OUTB. A basic diagram of the headphone/line amplifier is shown in Figure 43.

TAS5753MD TAS5729MD_Headphone-LineAmplifier.png Figure 43. Headphone/Line Amplifier

The DR_SDI pin can be used to turn on or off the headphone amplifier and line driver. The DirectPath amplifier makes use of the provided positive and negative supply rails generated by the IC. The output voltages are centered at zero volts with the capability to swing to the positive rail or negative rail; combining this capability with the built-in click and pop reduction circuit, the DirectPath amplifier requires no output dc blocking capacitors.

Fault Indication

ADR/FAULT is an input pin during power up. This pin can be programmed after RST to be an output by writing 1 to bit 0 of I²C register 0x05. In that mode, the ADR/FAULT pin has the definition shown in Table 3.

Any fault resulting in device shutdown is signaled by the ADR/FAULT pin going low (see Table 3). A latched version of this pin is available on D1 of register 0x02. This bit can be reset only by an I²C write.

Table 3. ADR/FAULT Output States

ADR/FAULT DESCRIPTION
0 Overcurrent (OC) or undervoltage (UVP) error or overtemperature error (OTE) or overvoltage error
1 No faults (normal operation)

SSTIMER Pin Functionality

The SSTIMER pin uses a capacitor connected between this pin and ground to control the output duty cycle when exiting all-channel shutdown. The capacitor on the SSTIMER pin is slowly charged through an internal current source, and the charge time determines the rate at which the output transitions from a near-zero duty cycle to the desired duty cycle. This allows for a smooth transition that minimizes audible pops and clicks. When the part is shut down, the drivers are placed in the high-impedance state and transition slowly down through an internal 3-kΩ resistor, similarly minimizing pops and clicks. The shutdown transition time is independent of the SSTIMER pin capacitance. Larger capacitors increase the start-up time, while smaller capacitors decrease the start-up time. The SSTIMER pin can be left floating for BD modulation.

Device Protection System

Overcurrent (OC) Protection With Current Limiting

The TAS5753MD device has independent, fast-reacting current detectors on all high-side and low-side power-stage FETs. The detector outputs are closely monitored to prevent the output current from increasing beyond the overcurrent threshold defined in the Protection Circuitry Characteristics table.

If the output current increases beyond the overcurrent threshold, the device shuts down and the outputs transition to the off or high impedance (Hi-Z) state. The device returns to normal operation once the fault condition (i.e., a short circuit on the output) is removed. Current-limiting and overcurrent protection are not independent for half-bridges. That is, if the bridge-tied load between half-bridges A and B causes an overcurrent fault, half-bridges A, B, C, and D shut down.

Overtemperature Protection

The TAS5753MD device has an overtemperature-protection system. If the device junction temperature exceeds 150°C (nominal), the device enters thermal shutdown, where all half-bridge outputs enter the high-impedance (Hi-Z) state, and ADR/FAULT asserts low if the device is configured to function as a fault output. The TAS5753MD device recovers automatically once the junction temperature of the device drops approximately 30°C.

Undervoltage Protection (UVP) and Power-On Reset (POR)

The UVP and POR circuits of the TAS5753MD device fully protect the device in any power-up/down and brownout situation. While powering up, the POR circuit resets the overload circuit (OLP) and ensures that all circuits are fully operational when the PVDD and AVDD supply voltages reach and 2.7 V, respectively. Although PVDD and AVDD are independently monitored. For PVDD, if the supply voltage drops below the UVP threshold, the protection feature immediately sets all half-bridge outputs to the high-impedance (Hi-Z) state and asserts ADR/FAULT low.

Device Functional Modes

The TAS5753MD device is a digital input class-d amplifier with audio processing capabilities. The TAS5753MD device has numerous modes to configure and control the device.

Serial Audio Port Operating Modes

The serial audio port in the TAS5753MD device supports industry-standard audio data formats, including I²S, Left-justified(LJ) and Right-justified(RJ) formats. To select the data format that will be used with the device can controlled by using the serial data interface registers 0x04. The default is 24bit, I²S mode. The timing diagrams for the various serial audio port are shown in the Serial Interface Control and Timing section

Communication Port Operating Modes

The TAS5753MD device is configured via an I²C communication port. The I²C communication protocol is detailed in the 7.7 I²C Serial Control Port Requirements and Specifications section.

Speaker Amplifier Modes

The TAS5753MD device can be configured as:

  • Stereo Mode
  • Mono Mode

Stereo Mode

Stereo mode is the most common option for the TAS5753MD. TAS5753MD can be connected in 2.0 mode to drive stereo channels. Detailed application section regarding the stereo mode is discussed in the Stereo Bridge Tied Load Application section.

Mono Mode

Mono mode is described as the operation where the two BTL outputs of amplifier are placed in parallel with one another to provide increase in the output power capability. This mode is typically used to drive subwoofers, which require more power to drive larger loudspeakers with high-amplitude, low-frequency energy. Detailed application section regarding the mono mode is discussed in the Mono Parallel Bridge Tied Load Application section.

Programming

I²C Serial Control Interface

The TAS5753MD device has a bidirectional I²C interface that is compatible with the Inter IC (I²C) bus protocol and supports both 100-kHz and 400-kHz data transfer rates for single- and multiple-byte write and read operations. This is a slave-only device that does not support a multimaster bus environment or wait-state insertion. The control interface is used to program the registers of the device and to read device status.

The DAP supports the standard-mode I²C bus operation (100 kHz maximum) and the fast I²C bus operation (400 kHz maximum). The DAP performs all I²C operations without I²C wait cycles.

General I²C Operation

The I²C bus employs two signals, SDA (data) and SCL (clock), to communicate between integrated circuits in a system. Data is transferred on the bus serially, one bit at a time. The address and data can be transferred in byte (8-bit) format, with the most-significant bit (MSB) transferred first. In addition, each byte transferred on the bus is acknowledged by the receiving device with an acknowledge bit. Each transfer operation begins with the master device driving a start condition on the bus and ends with the master device driving a stop condition on the bus. The bus uses transitions on the data pin (SDA) while the clock is high to indicate start and stop conditions. A high-to-low transition on SDA indicates a start and a low-to-high transition indicates a stop. Normal data-bit transitions must occur within the low time of the clock period. These conditions are shown in Figure 44. The master generates the 7-bit slave address and the read/write (R/W) bit to open communication with another device and then waits for an acknowledge condition. The TAS5753MD device holds SDA low during the acknowledge clock period to indicate an acknowledgment. When this occurs, the master transmits the next byte of the sequence. Each device is addressed by a unique 7-bit slave address plus R/W bit (1 byte). All compatible devices share the same signals via a bidirectional bus using a wired-AND connection. An external pullup resistor must be used for the SDA and SCL signals to set the high level for the bus.

TAS5753MD t0035-01.gif Figure 44. Typical I²C Sequence

No limit exists for the number of bytes that can be transmitted between start and stop conditions. When the last word transfers, the master generates a stop condition to release the bus. A generic data transfer sequence is shown in Figure 44.

The 7-bit address for the TAS5753MD device is 0101 010 (0x54) or 0101 011 (0x56) as defined by ADR/FAULT (external pulldown for 0x54 and pullup for 0x56).

I²C Slave Address

The ADR/FAULT is an input pin during power-up and after each toggle of RST, which is used to set the I²C sub-address of the device. The ADR/FAULT can also operate as a fault output after power-up is complete and the address has been latched in.

At power-up, and after each toggle of RST, the pin is read to determine its voltage level. If the pin is left floating, an internal pull-up will set the I²C sub-address to 0x56. This will also be the case if an external resistor is used to pull the pin up to AVDD. To set the sub-address to 0x54, an external resistor (specified in Typical Applications) must be connected to the system ground.

As mentioned, the pin can also be reconfigured as an output driver via I²C for fault monitoring. Use System Control Register 2 (0x05) to set ADR/FAULT pin to be used as a fault output during fault conditions.

I²C Device Address Change Procedure

  1. Write to device address change enable register, 0xF8 with a value of 0xF9A5 A5A5.
  2. Write to device register 0xF9 with a value of 0x0000 00XX, where XX is the new address.
  3. Any writes after that should use the new device address XX.

Single- and Multiple-Byte Transfers

The serial control interface supports both single-byte and multiple-byte read/write operations for subaddresses 0x00 to 0x1F. However, for the subaddresses 0x20 to 0xFF, the serial control interface supports only multiple-byte read/write operations (in multiples of 4 bytes).

During multiple-byte read operations, the DAP responds with data, a byte at a time, starting at the subaddress assigned, as long as the master device continues to respond with acknowledges. If a particular subaddress does not contain 32 bits, the unused bits are read as logic 0.

During multiple-byte write operations, the DAP compares the number of bytes transmitted to the number of bytes that are required for each specific subaddress. For example, if a write command is received for a biquad subaddress, the DAP must receive five 32-bit words. If fewer than five 32-bit data words have been received when a stop command (or another start command) is received, the received data is discarded.

Supplying a subaddress for each subaddress transaction is referred to as random I²C addressing. The TAS5753MD device also supports sequential I²C addressing. For write transactions, if a subaddress is issued followed by data for that subaddress and the 15 subaddresses that follow, a sequential I²C write transaction has taken place, and the data for all 16 subaddresses is successfully received by the TAS5753MD device. For I²C sequential-write transactions, the subaddress then serves as the start address, and the amount of data subsequently transmitted before a stop or start is transmitted determines how many subaddresses are written. As was true for random addressing, sequential addressing requires that a complete set of data be transmitted. If only a partial set of data is written to the last subaddress, the data for the last subaddress is discarded. However, all other data written is accepted; only the incomplete data is discarded.

Single-Byte Write

As shown in Figure 45, a single-byte data-write transfer begins with the master device transmitting a start condition followed by the I²C device address and the read/write bit. The read/write bit determines the direction of the data transfer. For a data-write transfer, the read/write bit is a 0. After receiving the correct I²C device address and the read/write bit, the DAP responds with an acknowledge bit. Next, the master transmits the address byte or bytes corresponding to the internal memory address being accessed. After receiving the address byte, the TAS5753MD device again responds with an acknowledge bit. Next, the master device transmits the data byte to be written to the memory address being accessed. After receiving the data byte, the TAS5753MD device again responds with an acknowledge bit. Finally, the master device transmits a stop condition to complete the single-byte data-write transfer.

TAS5753MD t0036-01.gif Figure 45. Single-Byte Write Transfer

Multiple-Byte Write

A multiple-byte data-write transfer is identical to a single-byte data-write transfer except that multiple data bytes are transmitted by the master device to the DAP as shown in Figure 46. After receiving each data byte, the TAS5753MD device responds with an acknowledge bit.

TAS5753MD t0036-02.gif Figure 46. Multiple-Byte Write Transfer

Single-Byte Read

As shown in Figure 47, a single-byte data-read transfer begins with the master device transmitting a start condition, followed by the I²C device address and the read/write bit. For the data read transfer, both a write followed by a read are actually done. Initially, a write is done to transfer the address byte or bytes of the internal memory address to be read. As a result, the read/write bit becomes a 0. After receiving the TAS5753MD address and the read/write bit, TAS5753MD device responds with an acknowledge bit. In addition, after sending the internal memory address byte or bytes, the master device transmits another start condition followed by the TAS5753MD address and the read/write bit again. This time, the read/write bit becomes a 1, indicating a read transfer. After receiving the address and the read/write bit, the TAS5753MD device again responds with an acknowledge bit. Next, the TAS5753MD device transmits the data byte from the memory address being read. After receiving the data byte, the master device transmits a not-acknowledge followed by a stop condition to complete the single-byte data-read transfer.

TAS5753MD t0036-03.gif Figure 47. Single-Byte Read Transfer

Multiple-Byte Read

A multiple-byte data-read transfer is identical to a single-byte data-read transfer except that multiple data bytes are transmitted by the TAS5753MD device to the master device as shown in Figure 48. Except for the last data byte, the master device responds with an acknowledge bit after receiving each data byte.

TAS5753MD t0036-04.gif Figure 48. Multiple-Byte Read Transfer

Serial Interface Control and Timing

Serial Data Interface

Serial data is input on SDIN. The PWM outputs are derived from SDIN. The TAS5753MD DAP accepts serial data in 16-bit, 20-bit, or 24-bit left-justified, right-justified, and I²S serial data formats.

I²S Timing

I²S timing uses LRCK to define when the data being transmitted is for the left channel and when the data is for the right channel. LRCK is low for the left channel and high for the right channel. A bit clock running at 32 × fS, 48 × fS, or 64 × fS is used to clock in the data. A delay of one bit clock exists from the time the LRCK signal changes state to the first bit of data on the data lines. The data is written MSB-first and is valid on the rising edge of bit clock. The DAP masks unused trailing data bit positions.

TAS5753MD t0034-01.gif

NOTE:

All data presented in two's-complement form with MSB first.
Figure 49. I²S 64-fS Format
TAS5753MD t0092-01.gif

NOTE:

All data presented in two's-complement form with MSB first.
Figure 50. I²S 48-fS Format
TAS5753MD t0266-01_los549.gif

NOTE:

All data presented in two's-complement form with MSB first.
Figure 51. I²S 32-fS Format

Left-Justified

Left-justified (LJ) timing uses LRCK to define when the data being transmitted is for the left channel and when the data is for the right channel. LRCK is high for the left channel and low for the right channel. A bit clock running at 32 × fS, 48 × fS, or 64 × fS is used to clock in the data. The first bit of data appears on the data lines at the same time LRCK toggles. The data is written MSB-first and is valid on the rising edge of the bit clock. The DAP masks unused trailing data bit positions.

TAS5753MD t0034-02.gif

NOTE:

All data presented in two's-complement form with MSB first.
Figure 52. Left-Justified 64-fS Format
TAS5753MD t0092-02.gif

NOTE:

All data presented in two's-complement form with MSB first.
Figure 53. Left-Justified 48-fS Format
TAS5753MD t0266-02_los549.gif

NOTE:

All data presented in two's-complement form with MSB first.
Figure 54. Left-Justified 32-fS Format

Right-Justified

Right-justified (RJ) timing uses LRCK to define when the data being transmitted is for the left channel and when the data is for the right channel. LRCK is high for the left channel and low for the right channel. A bit clock running at 32 × fS, 48 × fS, or 64 × fS is used to clock in the data. The first bit of data appears on the data 8 bit-clock periods (for 24-bit data) after LRCK toggles. In RJ mode, the LSB of data is always clocked by the last bit clock before LRCK transitions. The data is written MSB-first and is valid on the rising edge of bit clock. The DAP masks unused leading data bit positions.

TAS5753MD t0034-03.gif
All data presented in two's-complement form with MSB first.
Figure 55. Right-Justified 64-fS Format
TAS5753MD t0092-03.gif
All data presented in two's-complement form with MSB first.
Figure 56. Right-Justified 48-fS Format
TAS5753MD t0266-03_los549.gif
All data presented in two's-complement form with MSB first.
Figure 57. Right-Justified 32-fS Format

26-Bit 3.23 Number Format

All mixer gain coefficients are 26-bit coefficients using a 3.23 number format. Numbers formatted as 3.23 numbers mean that the binary point has 3 bits to the left and 23 bits to the right. This is shown in Figure 58.

TAS5753MD m0125-01_los599.gif Figure 58. 3.23 Format

The decimal value of a 3.23 format number can be found by following the weighting shown in . If the most significant bit is logic 0, the number is a positive number, and the weighting shown yields the correct number. If the most significant bit is a logic 1, then the number is a negative number. In the case every bit must be inverted, a 1 added to the result, and then the weighting shown in Figure 59 applies to obtain the magnitude of the negative number.

TAS5753MD m0126-01_los599.gif Figure 59. Conversion Weighting Factors—3.23 Format to Floating Point

Gain coefficients, entered via the I²C bus, must be entered as 32-bit binary numbers. The format of the 32-bit number (4-byte or 8-digit hexadecimal number) is shown in Figure 60.

TAS5753MD m0127-01_los599.gif Figure 60. Alignment of 3.23 Coefficient in 32-Bit I²C Word

Table 4. Sample Calculation for 3.23 Format

db Linear Decimal Hex (3.23 Format)
0 1 8,388,608 80 0000
5 1.77 14,917,288 00E3 9EA8
–5 0.56 4,717,260 0047 FACC
X L = 10(X / 20) D = 8,388,608 × L H = dec2hex (D, 8)

Table 5. Sample Calculation for 9.17 Format

db Linear Decimal Hex (9.17 Format)
0 1 131,072 2 0000
5 1.77 231,997 3 8A3D
–5 0.56 73,400 1 1EB8
X L = 10(X / 20) D = 131,072 × L H = dec2hex (D, 8)

Register Maps

Register Summary

SUBADDRESS REGISTER NAME NO. OF BYTES CONTENTS DEFAULT
VALUE
A u indicates unused bits.
0x00 Clock control register 1 Description shown in subsequent section 0x6C
0x01 Device ID register 1 Description shown in subsequent section 0x41
0x02 Error status register 1 Description shown in subsequent section 0x00
0x03 System control register 1 1 Description shown in subsequent section 0xA0
0x04 Serial data interface register 1 Description shown in subsequent section 0x05
0x05 System control register 2 1 Description shown in subsequent section 0x40
0x06 Soft mute register 1 Description shown in subsequent section 0x00
0x07 Master volume 2 Description shown in subsequent section 0x03FF (mute)
0x08 Channel 1 vol 2 Description shown in subsequent section 0x00C0 (0 dB)
0x09 Channel 2 vol 2 Description shown in subsequent section 0x00C0 (0 dB)
0x0A Channel 3 vol 2 Description shown in subsequent section 0x00C0 (0 dB)
0x0B Reserved 2 Reserved(1) 0x03FF
0x0C 2 Reserved(1) 0x00C0
0x0D 1 Reserved(1) 0xC0
0x0E Volume configuration register 1 Description shown in subsequent section 0xF0
0x0F Reserved 1 Reserved(1) 0x97
0x10 Modulation limit register 1 Description shown in subsequent section 0x01
0x11 IC delay channel 1 1 Description shown in subsequent section 0xAC
0x12 IC delay channel 2 1 Description shown in subsequent section 0x54
0x13 IC delay channel 3 1 Description shown in subsequent section 0xAC
0x14 IC delay channel 4 1 Description shown in subsequent section 0x54
0x15 Reserved 1 Reserved(1) 0xAC
0x16 0x54
0x17 0x00
0x18 PWM Start 0x0F
0x19 PWM Shutdown Group Register 1 Description shown in subsequent section 0x30
0x1A Start/stop period register 1 Description shown in subsequent section 0x68
0x1B Oscillator trim register 1 Description shown in subsequent section 0x82
0x1C BKND_ERR register 1 Description shown in subsequent section 0x57
0x1D–0x1F 1 Reserved(1) 0x00
0x20 Input MUX register 4 Description shown in subsequent section 0x0001 7772
0x21 Reserved 4 Reserved(1) 0x0000 4303
0x22 4 0x0000 0000
0x23 4 0x0000 0000
0x24 4 0x0000 0000
0x25 PWM MUX register 4 Description shown in subsequent section 0x0102 1345
0x26 ch1_bq[0] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x27 ch1_bq[1] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x28 ch1_bq[2] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x29 ch1_bq[3] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x2A ch1_bq[4] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x2B ch1_bq[5] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x2C ch1_bq[6] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x2D ch1_bq[7] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x2E ch1_bq[8] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x2F ch1_bq[9] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x30 ch2_bq[0] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x31 ch2_bq[1] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x32 ch2_bq[2] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x33 ch2_bq[3] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x34 ch2_bq[4] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x35 ch2_bq[5] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x36 ch2_bq[6] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x37 ch2_bq[7] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x38 ch2_bq[8] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x39 ch2_bq[9] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x3A Reserved 4 Reserved(1) 0x0080 0000 0000 0000
0x3B AGL1 softening filter alpha 8 u[31:26], ae[25:0] 0x0008 0000
AGL1 softening filter omega u[31:26], oe[25:0] 0x0078 0000
0x3C AGL1 attack rate 8 Description shown in subsequent section 0x0000 0100
AGL1 release rate Description shown in subsequent section 0xFFFF FF00
0x3D 8 Reserved(1)
0x3E AGL2 softening filter alpha 8 u[31:26], ae[25:0] 0x0008 0000
AGL2 softening filter omega u[31:26], oe[25:0] 0x0078 0000
0x3F AGL2 attack rate 8 u[31:26], at[25:0] 0x0008 0000
AGL2 release rate u[31:26], rt[25:0] 0xFFF8 0000
0x40 AGL1 attack threshold 4 T1[31:0] (9.23 format) 0x0800 0000
0x41 AGL3 attack threshold 4 T1[31:0] (9.23 format) 0x0074 0000
0x42 AGL3 attack rate 8 Description shown in subsequent section 0x0008 0000
AGL3 release rate Description shown in subsequent section 0xFFF8 0000
0x43 AGL2 attack threshold 4 T2[31:0] (9.23 format) 0x0074 0000
0x44 AGL4 attack threshold 4 T1[31:0] (9.23 format) 0x0074 0000
0x45 AGL4 attack rate 8 0x0008 0000
AGL4 release rate 0xFFF8 0000
0x46 AGL control 4 Description shown in subsequent section 0x0002 0000
0x47 AGL3 softening filter alpha 8 u[31:26], ae[25:0] 0x0008 0000
AGL3 softening filter omega u[31:26], oe[25:0] 0x0078 0000
0x48 AGL4 softening filter alpha 8 u[31:26], ae[25:0] 0x0008 0000
AGL4 softening filter omega u[31:26], oe[25:0] 0x0078 0000
0x49 Reserved 4 Reserved(1)
0x4A 4 0x1212 1010 E1FF FFFF F95E 1212
0x4B 4 0x0000 296E
0x4C 4 0x0000 5395
0x4D 4 0x0000 0000
0x4E 4 0x0000 0000
0x4F PWM switching rate control 4 u[31:4], src[3:0] 0x0000 0008
0x50 Bank switch control 4 Description shown in subsequent section 0x0F70 8000
0x51 Ch 1 output mixer 12 Ch 1 output mix1[2] 0x0080 0000
Ch 1 output mix1[1] 0x0000 0000
Ch 1 output mix1[0] 0x0000 0000
0x52 Ch 2 output mixer 12 Ch 2 output mix2[2] 0x0080 0000
Ch 2 output mix2[1] 0x0000 0000 
Ch 2 output mix2[0] 0x0000 0000 
0x53 16 Reserved(1) 0x0080 0000 0000 0000 0000 0000
0x54 16 Reserved(1) 0x0080 0000 0000 0000 0000 0000
0x56 Output post-scale 4 u[31:26], post[25:0] 0x0080 0000
0x57 Output pre-scale 4 u[31:26], pre[25:0] (9.17 format) 0x0002 0000
0x58 ch1_bq[10] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x59 ch1_cross_bq[0] 20 u[31:26], b0[25:0] 0x0080 0000
ch1_cross_bq[1] 0x0000 0000
ch1_cross_bq[2] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x5A ch1_cross_bq[1] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x5B ch1_cross_bq[2] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x5C ch1_cross_bq[3] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x5D ch2_bq[10] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x5E ch2_cross_bq[0] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x5F ch2_cross_bq[1] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x60 ch2_cross_bq[2] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x61 ch2_cross_bq[3] 20 u[31:26], b0[25:0] 0x0080 0000
u[31:26], b1[25:0] 0x0000 0000
u[31:26], b2[25:0] 0x0000 0000
u[31:26], a1[25:0] 0x0000 0000
u[31:26], a2[25:0] 0x0000 0000
0x62 IDF post scale 4 Description shown in subsequent section 0x0000 0080
0x63–0x69 Reserved 4 Reserved(1) 0x0000 0000
0x6A 4 0x0000 8312
0x6B Left channel PWM level meter 4 Data[31:0] 0x007F 7CED
0x6C Right channel PWM level meter 4 Data[31:0] 0x0000 0000
0x6D Reserved 8 Reserved(1) 0x0000 0000 0000 0000
0x6E–0x6F 4 0x0000 0000
0x70 ch1 inline mixer 4 u[31:26], in_mix1[25:0] 0x0080 0000
0x71 inline_AGL_en_mixer_ch1 4 u[31:26], in_mixagl_1[25:0] 0x0000 0000
0x72 ch1 right_channel mixer 4 u[31:26], right_mix1[25:0] 0x0000 0000
0x73 ch1 left_channel_mixer 4 u[31:26], left_mix_1[25:0] 0x0080 0000
0x74 ch2 inline mixer 4 u[31:26], in_mix2[25:0] 0x0080 0000
0x75 inline_AGL_en_mixer_ch2 4 u[31:26], in_mixagl_2[25:0] 0x0000 0000
0x76 ch2 left_chanel mixer 4 u[31:26], left_mix1[25:0] 0x0000 0000
0x77 ch2 right_channel_mixer 4 u[31:26], right_mix_1[25:0] 0x0080 0000
0x78–0xF7 Reserved(1) 0x0000 0000
0xF8 Update device address key 4 Dev Id Update Key[31:0] (Key = 0xF9A5A5A5) 0x0000 0054
0xF9 Update device address 4 u[31:8],New Dev Id[7:0] (New Dev Id = 0x54 for TAS5753MD) 0x0000 0054
0xFA–0xFF 4 Reserved(1) 0x0000 0000
Do not access reserved registers.

All DAP coefficients are 3.23 format unless specified otherwise.

Registers 0x3B through 0x46 should be altered only during the initialization phase.

Detailed Register Descriptions

Clock Control Register (0x00)

The clocks and data rates are automatically determined by the TAS5753MD. The clock control register contains the autodetected clock status. Bits D7–D5 reflect the sample rate. Bits D4–D2 reflect the MCLK frequency.

Table 6. Clock Control Register (0x00)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 0 0 fS = 32-kHz sample rate
0 0 1 Reserved
0 1 0 Reserved
0 1 1 fS = 44.1/48-kHz sample rate(1)
1 0 0 fS = 16-kHz sample rate
1 0 1 fS = 22.05/24-kHz sample rate
1 1 0 fS = 8-kHz sample rate
1 1 1 fS = 11.025/12-kHz sample rate
0 0 0 MCLK frequency = 64 × fS(2)
0 0 1 1 MCLK frequency = 128 × fS(2)
0 0 0 0 1 0 0 0 MCLK frequency = 192 × fS(3)
0 1 1 MCLK frequency = 256 × fS(1)(4)
1 0 0 MCLK frequency = 384 × fS
1 0 1 MCLK frequency = 512 × fS
1 1 0 Reserved
1 1 1 Reserved
0 Reserved
0 Reserved
Default values are in bold.
Only available for 44.1-kHz and 48-kHz rates
Rate only available for 32/44.1/48-KHz sample rates
Not available at 8 kHz

Device ID Register (0x01)

The device ID register contains the ID code for the firmware revision.

Table 7. General Status Register (0x01)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 0 0 0 0 0 0 0 Identification code (1)

Error Status Register (0x02)

The error bits are sticky and are not cleared by the hardware. This means that the software must clear the register (write zeroes) and then read them to determine if they are persistent errors.

Error definitions:

  • MCLK error: MCLK frequency is changing. The number of MCLKs per LRCLK is changing.
  • SCLK error: The number of SCLKs per LRCLK is changing.
  • LRCLK error: LRCLK frequency is changing.
  • Frame slip: LRCLK phase is drifting with respect to internal frame sync.

Table 8. Error Status Register (0x02)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
1 - MCLK error
1 PLL autolock error
1 SCLK error
1 LRCLK error
1 Frame slip
1 Clip indicator
1 Overcurrent, overtemperature, overvoltage, or undervoltage error
0 0 0 0 0 0 0 0 Reserved
0 0 0 0 0 0 0 0 No errors (1)

System Control Register 1 (0x03)

System control register 1 has several functions:

Bit D7: If 0, the dc-blocking filter for each channel is disabled.
If 1, the dc-blocking filter (–3 dB cutoff <1 Hz) for each channel is enabled.
Bit D5: If 0, use soft unmute on recovery from a clock error. This is a slow recovery. Unmute takes the same time as the volume ramp defined in register 0x0E.
If 1, use hard unmute on recovery from clock error. This is a fast recovery, a single-step volume ramp.
Bits D1–D0: Select de-emphasis

Table 9. System Control Register 1 (0x03)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 PWM high-pass (dc blocking) disabled
1 PWM high-pass (dc blocking) enabled (1)
0 Reserved (1)
1 Soft unmute on recovery from clock error (1)
1 Hard unmute on recovery from clock error
0 Reserved (1)
0 Reserved (1)
0 Reserved (1)
0 0 No de-emphasis (1)
0 1 De-emphasis for fS = 32 kHz
1 0 De-emphasis for fS = 44.1 kHz
1 1 De-emphasis for fS = 48 kHz

Serial Data Interface Register (0x04)

As shown in Table 10, the TAS5753MD supports nine serial data modes. The default is 24-bit, I2S mode.

Table 10. Serial Data Interface Control Register (0x04) Format

RECEIVE SERIAL DATA
INTERFACE FORMAT
WORD LENGTH D7–D4 D3 D2 D1 D0
Right-justified 16 0000 0 0 0 0
Right-justified 20 0000 0 0 0 1
Right-justified 24 0000 0 0 1 0
I2S 16 000 0 0 1 1
I2S 20 0000 0 1 0 0
I2S (1) 24 0000 0 1 0 1
Left-justified 16 0000 0 1 1 0
Left-justified 20 0000 0 1 1 1
Left-justified 24 0000 1 0 0 0
Reserved 0000 1 0 0 1
Reserved 0000 1 0 1 0
Reserved 0000 1 0 1 1
Reserved 0000 1 1 0 0
Reserved 0000 1 1 0 1
Reserved 0000 1 1 1 0
Reserved 0000 1 1 1 1

System Control Register 2 (0x05)

When bit D6 is set low, the system exits all-channel shutdown and starts playing audio; otherwise, the outputs are shut down (hard mute).

Table 11. System Control Register 2 (0x05)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 Mid-Z ramp disabled (1)
1 Mid-Z ramp enabled
0 Exit all-channel shutdown (normal operation)
1 Enter all-channel shutdown (hard mute) (1)
0 0 Reserved (1)
0 Ternary modulation disabled (1)
1 Ternary modulation enabled
0 Reserved (1)
0 configured as input
1 configured configured as output to function as fault output pin.
0 Reserved (1)
Default values are in bold.

Ternary modulation is disabled by default. To enable ternary modulation, the following writes are required before bringing the system out of shutdown:

  1. Set bit D3 of register 0x05 to 1.
  2. Write the following ICD settings:
    1. 0x11= 80
    2. 0x12= 7C
    3. 0x13= 80
    4. 0x14 =7C
  3. Set the input mux register as follows:
    1. 0x20 = 00 89 77 72

Soft Mute Register (0x06)

Writing a 1 to any of the following bits sets the output of the respective channel to 50% duty cycle (soft mute).

Table 12. Soft Mute Register (0x06)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 0 0 0 0 Reserved (1)
1 Soft mute channel 3
0 Soft unmute channel 3 (1)
1 Soft mute channel 2
0 Soft unmute channel 2 (1)
1 Soft mute channel 1
0 Soft unmute channel 1 (1)

Volume Registers (0x07, 0x08, 0x09)

The volume register 0x07, 0x08, and 0x09 correspond to master volume, channel 1 volume, and channel 2 volume, respectively. Step size is 0.125 dB and volume registers are 2 bytes.

Master volume – 0x07 (default is mute, 0x03FF)
Channel-1 volume – 0x08 (default is 0 dB, 0x00C0)
Channel-2 volume – 0x09 (default is 0 dB, 0x00C0)

Table 13. Master Volume Table

Value Level
0x0000 24.000
0x0001 23.875
... (0.125 dB steps)
0x03FE –103.750
0x03FF Mute

Volume Configuration Register (0x0E)

Bits D2–D0: Volume slew rate (used to control volume change and MUTE ramp rates). These bits control the number of steps in a volume ramp. Volume steps occur at a rate that depends on the sample rate of the I2S data as follows:
Sample rate (kHz) Approximate ramp rate
8/16/32 125 μs/step
11.025/22.05/44.1 90.7 μs/step
12/24/48 83.3 μs/step

In two-band AGL, register 0x0A should be set to 0x30 and register 0x0E bits 6 and 5 should be set to 1.

Table 14. Volume Configuration Register (0x0E)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
1 Reserved (1)
0 AGL2 volume 1 (ch4) from I2C register 0x08
1 AGL2 volume 1 (ch4) from I2C register 0x0A(1)
0 AGL2 volume 2 (ch3) from I2C register 0x09
1 AGL2 volume 2 (ch3) from I2C register 0x0A(1)
1 0 Reserved (1)
0 0 0 Volume slew 512 steps (43 ms volume ramp time at 48 kHz) (1)
0 0 1 Volume slew 1024 steps (85-ms volume ramp time at 48 kHz)
0 1 0 Volume slew 2048 steps (171-ms volume ramp time at 48 kHz)
0 1 1 Volume slew 256 steps (21-ms volume ramp time at 48 kHz)
1 X X Reserved

Modulation Limit Register (0x10)

Table 15. Modulation Limit Register (0x10)

D7 D6 D5 D4 D3 D2 D1 D0 MODULATION LIMIT
0 0 0 0 0 Reserved
0 0 0 Reserved
0 0 1 98.4%(1)
0 1 0 97.7%
0 1 1 96.9%
1 0 0 96.1%
1 0 1 95.3%
1 1 0 94.5%
1 1 1 93.8%

Interchannel Delay Registers (0x11, 0x12, 0x13, and 0x14)

Internal PWM channels 1, 2, 1, and 2 are mapped into registers 0x11, 0x12, 0x13, and 0x14.

Table 16. Channel Interchannel Delay Register Format

BITS DEFINITION D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 0 0 0 0 0 Minimum absolute delay, 0 DCLK cycles
0 1 1 1 1 1 Maximum positive delay, 31 × 4 DCLK cycles
1 0 0 0 0 0 Maximum negative delay, –32 × 4 DCLK cycles
0 0 Reserved
SUBADDRESS D7 D6 D5 D4 D3 D2 D1 D0 Delay = (value) × 4 DCLKs
0x11 1 0 1 0 1 1 Default value for channel 1 (1)
0x12 0 1 0 1 0 1 Default value for channel 2 (1)
0x13 1 0 1 0 1 1 Default value for channel 1 (1)
0x14 0 1 0 1 0 1 Default value for channel 2 (1)

ICD settings have high impact on audio performance (e.g., dynamic range, THD, crosstalk, etc.) Therefore, appropriate ICD settings must be used. By default, the device has ICD settings for the AD mode. If used in BD mode, then update these registers before coming out of all-channel shutdown.

MODE AD MODE BD MODE
0x11 AC B8
0x12 54 60
0x13 AC A0
0x14 54 48

PWM Shutdown Group Register (0x19)

Settings of this register determine which PWM channels are active. The functionality of this register is tied to the state of bit D5 in the system control register.

This register defines which channels belong to the shutdown group. If a 1 is set in the shutdown group register, that particular channel is not started following an exit out of all-channel shutdown command (if bit D5 is set to 0 in system control register 2, 0x05).

Table 17. PWM Shutdown Group Register (0x19)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 Reserved (1)
0 Reserved (1)
1 Reserved (1)
1 Reserved (1)
0 PWM channel 4 does not belong to shutdown group. (1)
1 PWM channel 4 belongs to shutdown group.
0 PWM channel 3 does not belong to shutdown group. (1)
1 PWM channel 3 belongs to shutdown group.
0 PWM channel 2 does not belong to shutdown group. (1)
1 PWM channel 2 belongs to shutdown group.
0 PWM channel 1 does not belong to shutdown group. (1)
1 PWM channel 1 belongs to shutdown group.

Start/Stop Period Register (0x1A)

This register is used to control the soft-start and soft-stop period following an enter/exit all-channel shutdown command or change in the PDN state. This helps reduce pops and clicks at start-up and shutdown. The times are only approximate and vary depending on device activity level and I2S clock stability.

Table 18. Start/Stop Period Register (0x1A)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 SSTIMER enabled (1)
1 SSTIMER disabled
1 1 Reserved (1)
0 0 No 50% duty cycle start/stop period
0 1 0 0 0 16.5-ms 50% duty cycle start/stop period
0 1 0 0 1 23.9-ms 50% duty cycle start/stop period
0 1 0 1 0 31.4-ms 50% duty cycle start/stop period
0 1 0 1 1 40.4-ms 50% duty cycle start/stop period
0 1 1 0 0 53.9-ms 50% duty cycle start/stop period
0 1 1 0 1 70.3-ms 50% duty cycle start/stop period
0 1 1 1 0 94.2-ms 50% duty cycle start/stop period
0 1 1 1 1 125.7-ms 50% duty cycle start/stop period(1)
1 0 0 0 0 164.6-ms 50% duty cycle start/stop period
1 0 0 0 1 239.4-ms 50% duty cycle start/stop period
1 0 0 1 0 314.2-ms 50% duty cycle start/stop period
1 0 0 1 1 403.9-ms 50% duty cycle start/stop period
1 0 1 0 0 538.6-ms 50% duty cycle start/stop period
1 0 1 0 1 703.1-ms 50% duty cycle start/stop period
1 0 1 1 0 942.5-ms 50% duty cycle start/stop period
1 0 1 1 1 1256.6-ms 50% duty cycle start/stop period
1 1 0 0 0 1728.1-ms 50% duty cycle start/stop period
1 1 0 0 1 2513.6-ms 50% duty cycle start/stop period
1 1 0 1 0 3299.1-ms 50% duty cycle start/stop period
1 1 0 1 1 4241.7-ms 50% duty cycle start/stop period
1 1 1 0 0 5655.6-ms 50% duty cycle start/stop period
1 1 1 0 1 7383.7-ms 50% duty cycle start/stop period
1 1 1 1 0 9897.3-ms 50% duty cycle start/stop period
1 1 1 1 1 13,196.4-ms 50% duty cycle start/stop period

Oscillator Trim Register (0x1B)

The TAS5753MD PWM processor contains an internal oscillator to support autodetect of I2S clock rates. This reduces system cost because an external reference is not required. A reference resistor must be connected between pin 16 and 17, as shown in Table 19.

Writing 0x00 to register 0x1B enables the trim that was programmed at the factory.

Note that trim must always be run following reset of the device.

Table 19. Oscillator Trim Register (0x1B)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
1 Reserved (1)
0 Oscillator trim not done (read-only) (1)
1 Oscillator trim done (read only)
0 0 0 0 Reserved (1)
0 Select factory trim (Write a 0 to select factory trim; default is 1.)
1 Factory trim disabled (1)
0 Reserved (1)

BKND_ERR Register (0x1C)

When a back-end error signal is received from the internal power stage, the power stage is reset, stopping all PWM activity. Subsequently, the modulator waits approximately for the time listed in Table 20 before attempting to re-start the power stage.

Table 20. BKND_ERR Register (0x1C)(1)

D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 1 0 1 x x x X Reserved
0 0 1 0 Set back-end reset period to 299 ms(1)
0 0 1 1 Set back-end reset period to 449 ms
0 1 0 0 Set back-end reset period to 598 ms
0 1 0 1 Set back-end reset period to 748 ms
0 1 1 0 Set back-end reset period to 898 ms
0 1 1 1 Set back-end reset period to 1047 ms
1 0 0 0 Set back-end reset period to 1197 ms
1 0 0 1 Set back-end reset period to 1346 ms
1 0 1 X Set back-end reset period to 1496 ms
1 1 1 X Set back-end reset period to 1496 ms
This register can be written only with a non-reserved value. The RSTz pin must be toggled between subsequent writes to this register.

Input Multiplexer Register (0x20)

This register controls the modulation scheme (AD or BD mode) as well as the routing of I2S audio to the internal channels.

Table 21. Input Multiplexer Register (0x20)

D31 D30 D29 D28 D27 D26 D25 D24 FUNCTION
0 0 0 0 0 0 0 0 Reserved (1)
D23 D22 D21 D20 D19 D18 D17 D16 FUNCTION
0 Channel-1 AD mode (1)
1 Channel-1 BD mode
0 0 0 SDIN-L to channel 1 (1)
0 0 1 SDIN-R to channel 1
0 1 0 Reserved
0 1 1 Reserved
1 0 0 Reserved
1 0 1 Reserved
1 1 0 Ground (0) to channel 1
1 1 1 Reserved
0 Channel 2 AD mode (1)
1 Channel 2 BD mode
0 0 0 SDIN-L to channel 2
0 0 1 SDIN-R to channel 2 (1)
0 1 0 Reserved
0 1 1 Reserved
1 0 0 Reserved
1 0 1 Reserved
1 1 0 Ground (0) to channel 2
1 1 1 Reserved
D15 D14 D13 D12 D11 D10 D9 D8 FUNCTION
0 1 1 1 0 1 1 1 Reserved (1)
D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 1 1 1 0 0 1 0 Reserved (1)

PWM Output MUX Register (0x25)

This DAP output mux selects which internal PWM channel is output to the external pins. Any channel can be output to any external output pin.

Bits D21–D20: Selects which PWM channel is output to AMP_OUT_A
Bits D17–D16: Selects which PWM channel is output to AMP_OUT_B
Bits D13–D12: Selects which PWM channel is output to AMP_OUT_C
Bits D09–D08: Selects which PWM channel is output to AMP_OUT_D

Note that channels are encoded so that channel 1 = 0x00, channel 2 = 0x01, …, channel 4 = 0x03.

Table 22. PWM Output MUX Register (0x25)

D31 D30 D29 D28 D27 D26 D25 D24 FUNCTION
0 0 0 0 0 0 0 1 Reserved (1)
D23 D22 D21 D20 D19 D18 D17 D16 FUNCTION
0 0 Reserved (1)
0 0 Multiplex channel 1 to AMP_OUT_A (1)
0 1 Multiplex channel 2 to AMP_OUT_A
1 0 Multiplex channel 1 to AMP_OUT_A
1 1 Multiplex channel 2 to AMP_OUT_A
0 0 Reserved (1)
0 0 Multiplex channel 1 to AMP_OUT_B
0 1 Multiplex channel 2 to AMP_OUT_B
1 0 Multiplex channel 1 to AMP_OUT_B (1)
1 1 Multiplex channel 2 to AMP_OUT_B
D15 D14 D13 D12 D11 D 10 D9 D8 FUNCTION
0 0 Reserved (1)
0 0 Multiplex channel 1 to AMP_OUT_C
0 1 Multiplex channel 2 to AMP_OUT_C (1)
1 0 Multiplex channel 1 to AMP_OUT_C
1 1 Multiplex channel 2 to AMP_OUT_C
0 0 Reserved (1)
0 0 Multiplex channel 1 to AMP_OUT_D
0 1 Multiplex channel 2 to AMP_OUT_D
1 0 Multiplex channel 1 to AMP_OUT_D
1 1 Multiplex channel 2 to AMP_OUT_D (1)
D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 1 0 0 0 1 0 1 Reserved (1)

AGL Control Register (0x46)

Table 23. AGL Control Register (0x46)

D31 D30 D29 D28 D27 D26 D25 D24 FUNCTION
0 0 0 0 0 0 0 0 Reserved (1)
D23 D22 D21 D20 D19 D18 D17 D16 FUNCTION
0 0 0 0 0 0 0 0 Reserved (1)
D15 D14 D13 D12 D11 D10 D9 D8 FUNCTION
0 0 0 0 0 0 0 0 Reserved (1)
D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 0 Reserved (1)
0 Reserved
1 Reserved
0 Reserved (1)
0 AGL4 turned OFF (1)
1 AGL4 turned ON
0 AGL3 turned OFF (1)
1 AGL3 turned ON
0 AGL2 turned OFF (1)
1 AGL2 turned ON
0 AGL1 turned OFF (1)
1 AGL1 turned ON

PWM Switching Rate Control Register (0x4F)

PWM switching rate should be selected through the register 0x4F before coming out of all-channnel shutdown.

Table 24. PWM Switching Rate Control Register (0x4F)

D31 D30 D29 D28 D27 D26 D25 D24 FUNCTION
0 0 0 0 0 0 0 0 Reserved (1)
D23 D22 D21 D20 D19 D18 D17 D16 FUNCTION
0 0 0 0 0 0 0 0 Reserved (1)
D15 D14 D13 D12 D11 D10 D9 D8 FUNCTION
0 0 0 0 0 0 0 0 Reserved (1)
D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 0 Reserved(1)
0 1 1 0 SRC = 6
0 1 1 1 SRC = 7
1 0 0 0 SRC = 8(1)
1 0 0 1 SRC = 9
1 0 1 0 Reserved
1 1 Reserved

Bank Switch and EQ Control (0x50)

Table 25. Bank Switching Command (0x50)

D31 D30 D29 D28 D27 D26 D25 D24 FUNCTION
0 0 0 0 1 1 1 1 Reserved (1)
D23 D22 D21 D20 D19 D18 D17 D16 FUNCTION
0 1 1 1 0 0 0 0 Reserved (1)
D15 D14 D13 D12 D11 D10 D9 D8 FUNCTION
0 0 0 0 0 0 0 0 Reserved (1)
D7 D6 D5 D4 D3 D2 D1 D0 FUNCTION
0 EQ ON (1)
1 EQ OFF (bypass BQ 1–11 of channels 1 and 2)
0 Reserved (1)
0 Ignore bank-mapping in bits D31–D8. Use default mapping. (1)
1 Use bank-mapping in bits D31–D8.
0 L and R can be written independently. (1)
1 L and R are ganged for EQ biquads; a write to the left-channel biquad is also written to the right-channel biquad. (0x29–0x2F is ganged to 0x30–0x36. Also, 0x58–0x5B is ganged to 0x5C–0x5F.
0 Reserved (1)
0 0 0 No bank switching. All updates to DAP (1)
0 0 1 Configure bank 1 (32 kHz by default)
0 1 X Reserved
1 X X Reserved