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

5.1.4 Attack Coefficient

The attack coefficient is the step rate response when Thermal Foldback triggers a gain decrease. The settling time of the signal is faster as this user-defined rate increases. This threshold is controlled by the coefficient YRAM_ATTACK_COEFFI_THF. Equation 17 shows how to compute the parameters from the desired attenuation rate in dB/step. The threshold range is from -6dB/step to 0dB/step and can be programmed in steps of 1x10^-6, where AR is the attack rate on the output signal in dB/step.

Equation 17. YRAM_ATTACK_COEFFI_THF = round(10AR/20×231)

Table 5-5 lists the registers corresponding to YRAM_ATTACK_COEFFI_THF. The default value (0x78D6FC9F) corresponds to -0.5dB/step.

Table 5-5 Programmable Coefficient Registers for Attack Rate
CoefficientPageRegisterReset ValueDescription
YRAM_ATTACK_COEFFI_THF0x1A0x300x00ASIOUT_BUF_VARS_BYT1[31:24]
YRAM_ATTACK_COEFFI_THF0x1A0x310x00ASIOUT_BUF_VARS_BYT2[23:16]
YRAM_ATTACK_COEFFI_THF0x1A0x320x00ASIOUT_BUF_VARS_BYT3[15:8]
YRAM_ATTACK_COEFFI_THF0x1A0x330x00ASIOUT_BUF_VARS_BYT4[7:0]