SBAA378B November   2019  – December 2023 PCM3140-Q1 , PCM5140-Q1 , PCM6140-Q1 , TLV320ADC3140 , TLV320ADC5140 , TLV320ADC6140

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Infinite Impulse Response Filters
    1. 2.1 Digital Biquad Filter
  6. 3  TLV320ADCx140/PCMx140-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 FiIter 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
  7. 4 How to Program the Digital Biquad Filters on TLV320ADCx140/PCMx140-Q1
  8. 5 Typical Audio Applications for Biquad Filtering
    1. 5.1 Parametric Equalizers
  9. 6 Crossover Networks
  10. 7 Voice Boost
  11. 8 Bass Boost
  12. 9 Removing 50 Hz–60 Hz Hum With Notch Filters
  13. 10Revision History
  14. 11Digital Filter Design Techniques
    1. 11.1 Analog Filters

Abstract

The TLV320ADCx140/PCMx140-Q1 device family (TLV320ADC3140, TLV320ADC5140, TLV320ADC6140, and PCM3140-Q1, PCM5140-Q1, PCM6140-Q1) is a quad-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:

  • Multi-channel, 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 Biquad filters
  • Automatic Gain Controller (AGC)
  • Dynamic Range Enhancer (DRE) support in TLV320ADC5140/PCM5140-Q1 and TLV320ADC6140/PCM6140-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 TLV320ADCx140/PCMx140-Q1 devices.