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

1 Using the Automatic Gain Controller (AGC) in the TLV320ADCx120 and PCMx120-Q1 Family

The TLV320ADCx120 and PCMx120-Q1 family of devices (TLV320ADC3120, TLV320ADC5120, TLV320ADC6120, PCM3120-Q1, PCM5120-Q1, and PCM6120-Q1) are dual-channel, high-performance, analog-to-digital converters for audio applications. This family of devices has an extensive set of features that includes the following:

  • Programmable channel gain (PGA)
  • Digital volume control
  • A programmable microphone bias voltage
  • A phase-locked loop (PLL)
  • A programmable high pass filter (HPF)
  • Automatic Gain Control (AGC)
  • Dynamic Range Enhancer (DRE) support in the TLV320ADC5120, TLV320ADC6120, PCM5120-Q1, and PCM6120-Q1
  • Linear phase or low-latency filter modes for sample-rates up to 768 kHz

This application note describes how to configure the automatic gain control (AGC) feature in TLV320ADCx120 and PCMx120-Q1 devices.