SLAAEI4 August   2024 TAC5111-Q1 , TAC5212-Q1 , TAC5311-Q1 , TAC5312-Q1 , TAC5411-Q1 , TAC5412-Q1 , TAD5212-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Signal Processing Chain
  6. 3Distortion Limiter
    1. 3.1 Distortion Limiter Parameters
      1. 3.1.1 Threshold Maximum
      2. 3.1.2 Threshold Minimum
      3. 3.1.3 Inflection Point
      4. 3.1.4 Slope
      5. 3.1.5 Attack Rate
      6. 3.1.6 Release Rate
      7. 3.1.7 Hold Counter
    2. 3.2 Limiter Response
  7. 4Brown-Out Protection
    1. 4.1 Brown-Out Protection Parameters
      1. 4.1.1 Critical Level
      2. 4.1.2 Gain Level
      3. 4.1.3 Attack Rate
      4. 4.1.4 Release Rate
      5. 4.1.5 Hold Counter
    2. 4.2 Brown-Out Protection Response
  8. 5Thermal Foldback
    1. 5.1 Thermal Foldback Parameters
      1. 5.1.1 Temperature Threshold
      2. 5.1.2 Maximum Attenuation Threshold
      3. 5.1.3 Slope
      4. 5.1.4 Attack Coefficient
      5. 5.1.5 Release Coefficient
      6. 5.1.6 Hold Counter
        1. 5.1.6.1 Thermal Foldback Response
  9. 6Example
  10. 7Summary
  11. 8References

Abstract

The TAx5xxx-Q1 family of audio converters are used in automotive applications that can experience exposure to high temperature conditions and sudden fluctuations in battery supply voltage (VBAT). The TAx5xxx-Q1 generation of Texas Instruments' audio converters introduces a Distortion Limiter, Brown-out Protector, and Thermal Foldback feature that monitors battery voltage and die temperature levels. This monitor function helps protect the device from these adverse factors by automatically attenuating the output signal.

The Distortion Limiter reduces the peak of the output signal and the Brown-out Protector applies a constant gain reduction to the output signal as a function of supply voltage. In addition,Thermal Foldback automatically attenuates the output signal, by reducing the gain, if the temperature of the die exceeds a programmable limit while audio is still present at the output.

The Distortion Limiter, Brown-out, and Thermal Foldback features are algorithms within the limiter bank of the DAC signal chain present in TAx5xxx-Q1 devices. This application note describes how to configure these features for the following devices:

  • TAC5411-Q1
  • TAC5412-Q1
  • TAC5311-Q1
  • TAC5312-Q1
  • TAC5212-Q1
  • TAC5211-Q1
  • TAC5111-Q1
  • TAD5212-Q1