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.