SBAA377B April   2022  – January 2024 PCM3120-Q1 , PCM5120-Q1 , PCM6120-Q1 , TLV320ADC3120 , TLV320ADC3140 , TLV320ADC5120 , TLV320ADC5140 , TLV320ADC6120 , TLV320ADC6140

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Inherent Anti-Aliasing in TLV320ADCx140/TLV320ADCx120/PCMx120-Q1/PCMx140-Q1
  6. 3Flexible Digital Filters
    1. 3.1 Multi-Stage Decimation Filters
      1. 3.1.1 Linear Phase
      2. 3.1.2 Low-Latency Filters
      3. 3.1.3 Ultra-Low-Latency Filters
    2. 3.2 Programmable Biquad Filters
  7. 4References
  8. 5Revision History

Abstract

Analog anti-aliasing filters attenuate out-of-band high-frequency components prior to analog-to-digital converters (ADC). These filters prevent high frequencies from aliasing or folding back into the band of interest and degrading the performance of the ADC. The TLV320ADCx140/PCMx140-Q1 family of audio ADCs (TLV320ADC3140, TLV320ADC5140, TLV320ADC6140, PCM3140-Q1, PCM5140-Q1, PCM6140-Q1) as well as TLV320ADCx120/PCMx120-Q1 (TLV320ADC3120, TLV320ADC5120, TLV320ADC6120, PCM3120-Q1,PCM5120-Q1, PCM6120-Q1) have a built-in anti-alias filter, so no external anti-alias filter is needed. This application note describes the included anti-alias filter in the analog-to-digital conversion process in TLV320ADCx140/TLV320ADCx120/PCMx120-Q1/PCMx140-Q1 devices.