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

3.1.3 Inflection Point

The inflection point sets the VBAT level where the Distortion Limiter begins to reduce the gain below the threshold maximum. The monitored level of VBAT must decrease below the inflection point for a period longer than the hold counter. This threshold is controlled by the coefficient YRAM_LIM_INF_PT. Equation 3 shows how to compute the parameters from the desired voltage value. The threshold range is from 0.01V to 15V and can be programmed in steps of 1x10^-6V, where V is the voltage level maximum in volts.

Equation 3. Y R A M _ L I M _ I N F _ P T   =   r o u n d ( V × 2 11 )

Table 3-4 lists the registers corresponding to YRAM_LIM_INF_PT. The default value (0x0000199A) corresponds to 3.2V.

Table 3-4 Programmable Coefficient Registers for Inflection Point
Coefficient Page Register Reset Value Description
YRAM_LIM_INF_PT 0x19 0x74 0x00 RDAC2_SF1_BYT1[31:24]
YRAM_LIM_INF_PT 0x19 0x75 0x00 RDAC2_SF1_BYT2[23:16]
YRAM_LIM_INF_PT 0x19 0x76 0x00 RDAC2_SF1_BYT3[15:8]