SLOS982C August   2017  – April 2018 TAS5755M

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Efficiency vs Total Output Power
      2.      Output Power vs Supply Voltage
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  PWM Operation at Recommended Operating Conditions
    6. 7.6  DC Electrical Characteristics
    7. 7.7  AC Electrical Characteristics (BTL, PBTL)
    8. 7.8  Electrical Characteristics - PLL External Filter Components
    9. 7.9  Electrical Characteristic - I2C Serial Control Port Operation
    10. 7.10 Timing Requirements - PLL Input Parameters
    11. 7.11 Timing Requirements - Serial Audio Ports Slave Mode
    12. 7.12 Timing Requirements - I2C Serial Control Port Operation
    13. 7.13 Timing Requirements - Reset (RESET)
    14. 7.14 Typical Characteristics
      1. 7.14.1 Typical Characteristics, 2.1 SE Configuration
      2. 7.14.2 Typical Characteristics, 2.0 BTL Configuration
      3. 7.14.3 Typical Characteristics, PBTL Configuration
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagrams
    3. 9.3 Feature Description
      1. 9.3.1  Power Supply
      2. 9.3.2  I2C Address Selection and Fault Output
      3. 9.3.3  Single-Filter PBTL Mode
      4. 9.3.4  Device Protection System
        1. 9.3.4.1 Overcurrent (OC) Protection With Current Limiting
        2. 9.3.4.2 Overtemperature Protection
        3. 9.3.4.3 Undervoltage Protection (UVP) and Power-On Reset (POR)
      5. 9.3.5  SSTIMER Functionality
      6. 9.3.6  Clock, Autodetection, and PLL
      7. 9.3.7  PWM Section
      8. 9.3.8  2.1-Mode Support
      9. 9.3.9  I2C Compatible Serial Control Interface
      10. 9.3.10 Audio Serial Interface
        1. 9.3.10.1 I2S Timing
        2. 9.3.10.2 Left-Justified
        3. 9.3.10.3 Right-Justified
      11. 9.3.11 Dynamic Range Control (DRC)
    4. 9.4 Device Functional Modes
      1. 9.4.1 Stereo BTL Mode
      2. 9.4.2 Mono PBTL Mode
      3. 9.4.3 2.1 Mode
    5. 9.5 Programming
      1. 9.5.1 I2C Serial Control Interface
        1. 9.5.1.1 General I2C Operation
        2. 9.5.1.2 Single- and Multiple-Byte Transfers
        3. 9.5.1.3 Single-Byte Write
        4. 9.5.1.4 Multiple-Byte Write
        5. 9.5.1.5 Single-Byte Read
        6. 9.5.1.6 Multiple-Byte Read
      2. 9.5.2 26-Bit 3.23 Number Format
    6. 9.6 Register Maps
      1. 9.6.1 Register Map Summary
      2. 9.6.2 Register Maps
        1. 9.6.2.1  Clock Control Register (0x00)
        2. 9.6.2.2  Device ID Register (0x01)
        3. 9.6.2.3  Error Status Register (0x02)
        4. 9.6.2.4  System Control Register 1 (0x03)
        5. 9.6.2.5  Serial Data Interface Register (0x04)
        6. 9.6.2.6  System Control Register 2 (0x05)
        7. 9.6.2.7  Soft Mute Register (0x06)
        8. 9.6.2.8  Volume Registers (0x07, 0x08, 0x09, 0x0A)
        9. 9.6.2.9  Volume Configuration Register (0x0E)
        10. 9.6.2.10 Modulation Limit Register (0x10)
        11. 9.6.2.11 Interchannel Delay Registers (0x11, 0x12, 0x13, and 0x14)
        12. 9.6.2.12 PWM Shutdown Group Register (0x19)
        13. 9.6.2.13 Start/Stop Period Register (0x1A)
        14. 9.6.2.14 Oscillator Trim Register (0x1B)
        15. 9.6.2.15 BKND_ERR Register (0x1C)
        16. 9.6.2.16 Input Multiplexer Register (0x20)
        17. 9.6.2.17 Channel 4 Source Select Register (0x21)
        18. 9.6.2.18 PWM Output Mux Register (0x25)
        19. 9.6.2.19 DRC Control Register (0x46)
        20. 9.6.2.20 Bank Switch and EQ Control Register (0x50)
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Stereo Bridge Tied Load Application
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Component Selection and Hardware Connections
          2. 10.2.1.2.2 I2C Pullup Resistors
          3. 10.2.1.2.3 Digital I/O Connectivity
          4. 10.2.1.2.4 Recommended Start-Up and Shutdown Procedures
            1. 10.2.1.2.4.1 Initialization Sequence
            2. 10.2.1.2.4.2 Normal Operation
            3. 10.2.1.2.4.3 Shutdown Sequence
            4. 10.2.1.2.4.4 Power-Down Sequence
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Mono Parallel Bridge Tied Load Application
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curves
      3. 10.2.3 2.1 Application
        1. 10.2.3.1 Design Requirements
        2. 10.2.3.2 Detailed Design Procedure
        3. 10.2.3.3 Application Curves
  11. 11Power Supply Recommendations
    1. 11.1 DVDD and AVDD Supplies
    2. 11.2 PVDD Power Supply
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Examples
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Development Support
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary

12.1 Layout Guidelines

Class-D switching edges are fast and switched currents are high so it is necessary to take care when planning the layout of the printed circuit board. The following suggestions will help to meet audio, thermal and EMC requirements.

  • Decoupling capacitors: the high-frequency decoupling capacitors must be placed as close to the supply pins as possible; on the TAS5755M a 1-µF high-quality ceramic capacitor is used. Large (10 μF or greater) bulk power supply decoupling capacitors must be placed near the TAS5755M on the PVDD supplies.
  • Keep the current loop from each of the outputs through the output inductor and the small filter cap and back to GND as small and tight as possible. The size of this current loop determines its effectiveness as an antenna.
  • Grounding: A big common GND plane is recommended. The PVDD decoupling capacitors must connect to GND. The TAS5755M PowerPAD must be connected to GND.
  • Output filter: remember to select inductors that can handle the high short circuit current of the device. The LC filter must be placed close to the outputs.

The EVM product folder (TAS5755EVM) and User’s Guide (SLOU481A) available on www.ti.com show schematic, bill of material, gerber files, and more detailed layout plots.