SBAA492A September   2021  – April 2022 PCM3120-Q1 , PCM5120-Q1 , PCM6120-Q1 , TLV320ADC3120 , TLV320ADC5120 , TLV320ADC6120

 

  1.   Trademarks
  2. 1Introduction
  3. 2Automatic Gain Control
    1. 2.1 High Pass Filter
    2. 2.2 AGC Parameters
  4. 3AGC Results
    1. 3.1 Normal AGC Mode
    2. 3.2 Enhanced AGC mode
  5. 4Examples
  6. 5Related Documentation
  7.   A Revision History

Enhanced AGC mode

AGC curves (output level vs. input level and THDN vs. input level) for different sampling rates, 48 KHz in Figure 3-7 and Figure 3-8, 16 KHz in Figure 3-9 and Figure 3-10 and 96 KHz in Figure 3-11 and Figure 3-12 for enhanced AGC mode.

GUID-20210826-SS0I-KHZH-DPQ5-ZVT7VKQ6TLL5-low.gifFigure 3-7 Output Level vs. Input Level 48 KHz (Enhanced mode)
GUID-20210826-SS0I-SNNQ-NKW2-MRGFVQHFL9QK-low.gifFigure 3-8 THDN vs. Input_Level 48 KHz (Enhanced Mode)

Forward sweep: Enhanced mode behavior is same as normal mode behavior for input level sweep in the forward direction from -130 dB to -1 dB. For full scale input (0dB) also AGC output level is held at -31 dB when we are in Enhanced AGC mode.

Backward sweep: Enhanced mode behavior is same as normal mode behavior for input level sweep in the backward direction from 0 dB to -130 dB.

AGC disabled: Enhanced mode behavior is same as normal mode behavior when AGC is disabled.

GUID-20210826-SS0I-W0Z2-44DJ-LJRXWBQ5BZMN-low.gifFigure 3-9 Output Level vs. Input Level 16 KHz (Enhanced Mode)
GUID-20210826-SS0I-JRLW-SSFW-BT8LGGD4T1ST-low.gifFigure 3-11 Output Level vs. Input Level 96 KHz (Enhanced Mode)
GUID-20210826-SS0I-HSJT-ZNFL-QDZPKXW2R2GB-low.gifFigure 3-10 THDN vs. Input_Level 16 KHz (Enhanced Mode)
GUID-20210826-SS0I-1ZZT-HSZX-ZKVLL0BJ7C7M-low.gifFigure 3-12 THDN vs. Input_Level 96 KHz (Enhanced Mode)