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

3.1.1 Threshold Maximum

The threshold maximum is the maximum peak output signal. The target level is expressed relative to full scale (dBFS) of the DAC output. This threshold is controlled by the coefficient YRAM_LIM_TH_MAX. Equation 1 shows how to compute the parameters from the desired dB value. The maximum peak range is from -50dB to 24dB and can be programmed in steps of 1x10^-6dB, where PO is the peak output level in dB.

Equation 1. YRAM_LIM_THR_MAX = round(10((PO+3)/20)×224)

Table 3-2 lists the registers corresponding to YRAM_LIM_TH_MAX. The default value (0x1699C0F) corresponds to 3dB.

Table 3-2 Programmable Coefficient Registers for Threshold Maximum
CoefficientPageRegisterReset ValueDescription
yram_lim_th_max0x190x6C0x00RDAC_SF1_BYT1[31:24]
yram_lim_th_max0x190x6D0x00RDAC_SF1_BYT2[23:16]
yram_lim_th_max0x190x6E0x00RDAC_SF1_BYT3[15:8]
yram_lim_th_max0x190x6F0x00RDAC_SF1_BYT4[7:0]