SBAA497B May   2021  – April 2022 PCM3120-Q1 , PCM5120-Q1 , PCM6120-Q1 , TLV320ADC3120 , TLV320ADC5120 , TLV320ADC6120

 

  1.   Trademarks
  2. 1Introduction
  3. 2Infinite Impulse Response Filters
    1. 2.1 Digital Biquad Filter
  4. 3TLV320ADCx120 and PCMx120-Q1 Digital Biquad Filters
    1. 3.1 Filter Design Using PurePath Console
      1. 3.1.1 Example Generating Programmable Biquad Coefficients Using PurePath Console
    2. 3.2 How to Generate N0, N1, N2, D1, and D2 Coefficients with a Digital Filter Design Package
    3. 3.3 Avoid Overflow Conditions
    4. 3.4 Digital Biquad Filter Allocation to Output Channel
    5. 3.5 Programmable Coefficient Registers for Digital Biquad Filters 1–6
    6. 3.6 Programmable Coefficient Registers for Digital Biquad Filters 7–12
  5. 4How to Program the Digital Biquad Filters on the TLV320ADCx120 and PCMx120-Q1
  6. 5Typical Audio Applications for Biquad Filtering
    1. 5.1 Parametric Equalizers
  7. 6Crossover Networks
  8. 7Voice Boost
  9. 8Bass Boost
  10. 9Removing 50 Hz–60 Hz Hum With Notch Filters
  11.   A Digital Filter Design Techniques
    1.     A.A Analog Filters
  12.   B Related Documentation
  13.   B Revision History

1 Abstract

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

  • Multichannel, multi-bit, high-performance delta-sigma ADC
  • Configurable single-ended or differential audio inputs
  • A low-noise programmable microphone bias voltage output
  • An integrated low-jitter phase-locked loop (PLL)
  • Linear phase or Low-latency decimation filters with sample rates up to 768 kHz
  • Programmable phase and gain calibration with fine resolution for each channel
  • Programmable channel gain
  • Digital volume control
  • Digital channel mixer
  • A programmable high-pass filter (HPF)
  • A programmable Infinite Impulse Response Bi-quad filters
  • Automatic Gain Controller (AGC)
  • Dynamic Range Enhancer (DRE) support in TLV320ADC5120, TLV320ADC6120, PCM5120-Q1 and PCM6120-Q1
  • Pulse density modulation (PDM) digital microphone interface with high-performance decimation filters

This application note describes how to configure the programmable Infinite Impulse Response (IIR) Digital Biquad Filters of the TLV320ADCx120 and PCMx120-Q1 devices.