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

5.1.2 Maximum Attenuation Threshold

The maximum attenuation threshold is the maximum amount of attenuation applied to the output signal if the temperature threshold is triggered. This threshold is controlled by the coefficient YRAM_GAIN_MAX_ATTN_THF. Equation 15 shows how to compute the parameters from the desired maximum attenuation applied in dB. The threshold range is from 0dB to -70dB and can be programmed in 1dB steps, where MA is the maximum attenuation level in dB.

Equation 15. YRAM_GAIN_MAX_ATTN_THF = round(10MA/20×231)

Table 5-3 lists the registers corresponding to YRAM_GAIN_MAX_ATTN_THF. The default value (0x2D6A866F) corresponds to -9dB.

Table 5-3 Programmable Coefficient Registers for Maximum Attenuation
CoefficientPageRegisterReset ValueDescription
YRAM_GAIN_MAX_ATTN_THF0x1A0x400x00ASIOUT_BUF_VARS_BYT1[31:24]
YRAM_GAIN_MAX_ATTN_THF0x1A0x410x00ASIOUT_BUF_VARS_BYT2[23:16]
YRAM_GAIN_MAX_ATTN_THF0x1A0x420x00ASIOUT_BUF_VARS_BYT3[15:8]
YRAM_GAIN_MAX_ATTN_THF0x1A0x430x00ASIOUT_BUF_VARS_BYT4[7:0]