SLAAED0 March   2024 TAS2764 , TAS2780 , TAS2781

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Measurement Methodology
  6. 3 Introduction to Noise-gate and Pop in Class-D Amplifiers
  7. 4 Causes of Pop in TAS27xx family of Class-D Amplifiers
  8. 5 Click and Pop Using TAS27xx
  9. 6 Click and Pop Measurement Technique Using AP v6.0. 2
    1. 6.1  Measurement Setup
    2. 6.2  Filter Settings
    3. 6.3  Data Capture Settings
    4. 6.4  Auto Range Settings for Pop Measurement
    5. 6.5  ASI or I2S Configurations for Pop Measurement
    6. 6.6  APx Sound Level Meter Utility
    7. 6.7  Data Acquisition
    8. 6.8  Interpreting Click and Pop Waveforms
    9. 6.9  Post Processing of AP Waveforms
    10. 6.10 A-Weighted Click and Pop Numbers
    11. 6.11 Exporting the A-Weighted Numbers
  10. 7 Noise-Gate Pop and Measurement Technique Using APx
  11. 8 Configuring TAS2764 for Improved Click and Pop Noise Performance
    1. 8.1 Explanation
  12. 9 Summary
  13. 10References

4 Causes of Pop in TAS27xx family of Class-D Amplifiers

The following events on TAS27xx family of amplifiers can lead to a very low, regulated click and pop at the Class-D output:

  • Active to Software shutdown
  • Shutdown to Active mode
  • Noise gate entry and exit (As per audio input and NG threshold (Note: Increasing Noise gate threshold higher than default settings can result in higher click and pop)
  • Idle channel detect entry and exit

The following events can trigger very high or uncertain pop:

  • Software or hardware reset.
  • Fault conditions in the device such as clock error, over-current error, over-temperature error, and so on. (These conditions can result in very high pop due to abrupt shutdown).
  • Abrupt dips and overshoots in the supply beyond data sheet limits.
  • Incorrect hardware/software configuration of the device.