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

Programmable Biquad Filters

In addition to the multi-stage decimation filters for out-of-band attenuation, the TLV320ADCx140/TLV320ADCx120/PCMx120-Q1/PCMx140-Q1 devices also support digital bi-quad filters for in-band frequency shaping. For example, in noise cancellation or equalization, the signal band of interest is usually less than a few 100 Hz. Using programmable digital bi-quad filters, the filter parameters can be configured to suppress undesirable audio signals prior to any digital processing. These filters can be used as low-pass, high-pass, band-pass, or band-reject filters. For additional information on bi-quad filter configuration, refer to the TLV320ADCx140 Programmable Bi-quad Filter Configuration and Applications, application note.