JAJSGO8F July   2013  – February 2020 TAS5760M

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      機能ブロック図
      2.      10% THD+Nでの電力とPVDDとの関係
  4. 4 改訂履歴
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
    2.     Pin Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Digital I/O Pins
    5. 6.5  Master Clock
    6. 6.6  Serial Audio Port
    7. 6.7  Protection Circuitry
    8. 6.8  Speaker Amplifier in All Modes
    9. 6.9  Speaker Amplifier in Stereo Bridge Tied Load (BTL) Mode
    10. 6.10 Speaker Amplifier in Mono Parallel Bridge Tied Load (PBTL) Mode
    11. 6.11 I²C Control Port
    12. 6.12 Typical Idle, Mute, Shutdown, Operational Power Consumption
    13. 6.13 Typical Characteristics (Stereo BTL Mode): fSPK_AMP = 384 kHz
    14. 6.14 Typical Characteristics (Stereo BTL Mode): fSPK_AMP = 768 kHz
    15. 6.15 Typical Characteristics (Mono PBTL Mode): fSPK_AMP = 384 kHz
    16. 6.16 Typical Characteristics (Mono PBTL Mode): fSPK_AMP = 768 kHz
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
      1. 8.2.1 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power Supplies
      2. 8.3.2 Speaker Amplifier Audio Signal Path
        1. 8.3.2.1 Serial Audio Port (SAP)
          1. 8.3.2.1.1 I²S Timing
          2. 8.3.2.1.2 Left-Justified
          3. 8.3.2.1.3 Right-Justified
        2. 8.3.2.2 DC Blocking Filter
        3. 8.3.2.3 Digital Boost and Volume Control
        4. 8.3.2.4 Digital Clipper
        5. 8.3.2.5 Closed-Loop Class-D Amplifier
      3. 8.3.3 Speaker Amplifier Protection Suite
        1. 8.3.3.1 Speaker Amplifier Fault Notification (SPK_FAULT Pin)
        2. 8.3.3.2 DC Detect Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Hardware Control Mode
        1. 8.4.1.1 Speaker Amplifier Shut Down (SPK_SD Pin)
        2. 8.4.1.2 Serial Audio Port in Hardware Control Mode
        3. 8.4.1.3 Soft Clipper Control (SFT_CLIP Pin)
        4. 8.4.1.4 Speaker Amplifier Switching Frequency Select (FREQ/SDA Pin)
        5. 8.4.1.5 Parallel Bridge Tied Load Mode Select (PBTL/SCL Pin)
        6. 8.4.1.6 Speaker Amplifier Sleep Enable (SPK_SLEEP/ADR Pin)
        7. 8.4.1.7 Speaker Amplifier Gain Select (SPK_GAIN [1:0] Pins)
        8. 8.4.1.8 Considerations for Setting the Speaker Amplifier Gain Structure
          1. 8.4.1.8.1 Recommendations for Setting the Speaker Amplifier Gain Structure in Hardware Control Mode
      2. 8.4.2 Software Control Mode
        1. 8.4.2.1 Speaker Amplifier Shut Down (SPK_SD Pin)
        2. 8.4.2.2 Serial Audio Port Controls
          1. 8.4.2.2.1 Serial Audio Port (SAP) Clocking
        3. 8.4.2.3 Parallel Bridge Tied Load Mode via Software Control
        4. 8.4.2.4 Speaker Amplifier Gain Structure
          1. 8.4.2.4.1 Speaker Amplifier Gain in Software Control Mode
          2. 8.4.2.4.2 Considerations for Setting the Speaker Amplifier Gain Structure
          3. 8.4.2.4.3 Recommendations for Setting the Speaker Amplifier Gain Structure in Software Control Mode
        5. 8.4.2.5 I²C Software Control Port
          1. 8.4.2.5.1 Setting the I²C Device Address
          2. 8.4.2.5.2 General Operation of the I²C Control Port
          3. 8.4.2.5.3 Writing to the I²C Control Port
          4. 8.4.2.5.4 Reading from the I²C Control Port
    5. 8.5 Register Maps
      1. 8.5.1 Control Port Registers - Quick Reference
      2. 8.5.2 Control Port Registers - Detailed Description
        1. 8.5.2.1  Device Identification Register (0x00)
          1. Table 9. Device Identification Register Field Descriptions
        2. 8.5.2.2  Power Control Register (0x01)
          1. Table 10. Power Control Register Field Descriptions
        3. 8.5.2.3  Digital Control Register (0x02)
          1. Table 11. Digital Control Register Field Descriptions
        4. 8.5.2.4  Volume Control Configuration Register (0x03)
          1. Table 12. Volume Control Configuration Register Field Descriptions
        5. 8.5.2.5  Left Channel Volume Control Register (0x04)
          1. Table 13. Left Channel Volume Control Register Field Descriptions
        6. 8.5.2.6  Right Channel Volume Control Register (0x05)
          1. Table 14. Right Channel Volume Control Register Field Descriptions
        7. 8.5.2.7  Analog Control Register (0x06)
          1. Table 15. Analog Control Register Field Descriptions
        8. 8.5.2.8  Reserved Register (0x07)
        9. 8.5.2.9  Fault Configuration and Error Status Register (0x08)
          1. Table 16. Fault Configuration and Error Status Register Field Descriptions
        10. 8.5.2.10 Reserved Controls (9 / 0x09) - (15 / 0x0F)
        11. 8.5.2.11 Digital Clipper Control 2 Register (0x10)
          1. Table 17. Digital Clipper Control 2 Register Field Descriptions
        12. 8.5.2.12 Digital Clipper Control 1 Register (0x11)
          1. Table 18. Digital Clipper Control 1 Register Field Descriptions
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Stereo BTL Using Software Control
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Startup Procedures- Software Control Mode
          2. 9.2.1.2.2 Shutdown Procedures- Software Control Mode
          3. 9.2.1.2.3 Component Selection and Hardware Connections
            1. 9.2.1.2.3.1 I²C Pullup Resistors
            2. 9.2.1.2.3.2 Digital I/O Connectivity
          4. 9.2.1.2.4 Recommended Startup and Shutdown Procedures
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Stereo BTL Using Software Control, 32-Pin DAP Package Option
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Startup Procedures- Software Control Mode
          2. 9.2.2.2.2 Shutdown Procedures- Software Control Mode
          3. 9.2.2.2.3 Component Selection and Hardware Connections
            1. 9.2.2.2.3.1 I²C Pullup Resistors
            2. 9.2.2.2.3.2 Digital I/O Connectivity
          4. 9.2.2.2.4 Recommended Startup and Shutdown Procedures
        3. 9.2.2.3 Application Curve
      3. 9.2.3 Stereo BTL Using Hardware Control, 32-Pin DAP Package Option
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
          1. 9.2.3.2.1 Startup Procedures - Hardware Control Mode
          2. 9.2.3.2.2 Shutdown Procedures - Hardware Control Mode
          3. 9.2.3.2.3 Digital I/O Connectivity
        3. 9.2.3.3 Application Curve
      4. 9.2.4 Mono PBTL Using Software Control, 32-Pin DAP Package Option
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
          1. 9.2.4.2.1 Startup Procedures - Software Control Mode
          2. 9.2.4.2.2 Shutdown Procedures - Software Control Mode
          3. 9.2.4.2.3 Component Selection and Hardware Connections
            1. 9.2.4.2.3.1 I²C Pull-Up Resistors
            2. 9.2.4.2.3.2 Digital I/O Connectivity
              1. 9.2.4.2.3.2.1 Application Curves
      5. 9.2.5 Mono PBTL Using Hardware Control, 32-Pin DAP Package Option
        1. 9.2.5.1 Design Requirements
        2. 9.2.5.2 Detailed Design Procedure
          1. 9.2.5.2.1 Startup Procedures - Hardware Control Mode
          2. 9.2.5.2.2 Shutdown Procedures - Hardware Control Mode
          3. 9.2.5.2.3 Digital I/O Connectivity
          4. 9.2.5.2.4 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 DVDD Supply
    2. 10.2 PVDD Supply
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 General Guidelines for Audio Amplifiers
      2. 11.1.2 Importance of PVDD Bypass Capacitor Placement on PVDD Network
      3. 11.1.3 Optimizing Thermal Performance
        1. 11.1.3.1 Device, Copper, and Component Layout
        2. 11.1.3.2 Stencil Pattern
          1. 11.1.3.2.1 PCB Footprint and Via Arrangement
            1. 11.1.3.2.1.1 Solder Stencil
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 ドキュメントのサポート
      1. 12.1.1 関連資料
    2. 12.2 サポート・リソース
    3. 12.3 商標
    4. 12.4 静電気放電に関する注意事項
    5. 12.5 Glossary
  13. 13メカニカル、パッケージ、および注文情報

8.3.2.4 Digital Clipper

A digital clipper is integrated in the oversampled domain to provide a component-free method to set the clip point of the speaker amplifier. Through the "Digital Clipper Level x" controls in the I²C control port, the point at which the oversampled digital path clips can be set directly, which in turns sets the 10% THD+N operating point of the amplifier. This is useful for applications in which a single system is designed for use in several end applications that have different power rating specifications. Its place in the oversampled domain ensures that the digital clipper is acoustically appealing and reduces or eliminates tones which would otherwise foldback into the audio band during clipping events. Figure 43 shows a block diagram of the digital clipper.

TAS5760M BD_Digital_Clipper.gifFigure 43. Digital Clipper Simplified Block Diagram

As mentioned previously, the audio signature of the amplifier when the digital clipper is active is very smooth, owing to its place in the signal chain. Figure 44 shows the typical behavior of the clipping events.

TAS5760M Digital_Clipper_ScrnShot.gifFigure 44. Digital Clipper Example Waveform for Various Settings of Digital Clip Level [19:0]

It is important to note that the actual signal developed across the speaker will be determined not only by the digital clipper, but also the analog gain of the amplifier. Depending on the analog gain settings and the PVDD level applied, clipping could occur as a result of the voltage swing that is determined by the gain being larger than the available PVDD supply rail. The gain structures are discussed in detail below for both Hardware Control Mode and Software Control Mode.