1 Features

• Multichannel high-performance ADC:

– 2-channel analog microphones or line-in

– 4-channel digital PDM microphones

– Up to 2 analog and up to 2 digital microphone

channels

• ADC line and microphone differential input

performance:

– Dynamic range (DR): 106 dB

– THD+N: –95 dB

• ADC channel summing mode, DR performance:

– 109-dB, 2-channel summing

• ADC input voltage:

– Differential, 2-VRMS full-scale inputs

– Single-ended, 1-VRMS full-scale inputs

• ADC sample rate (fS) = 8 kHz to 768 kHz

• Programmable channel settings:

– Channel gain: 0 dB to 42 dB, 0.5-dB steps

– Digital volume control: –100 dB to 27 dB

– Gain calibration with 0.1-dB resolution

– Phase calibration with 163-ns resolution

• Programmable microphone bias or supply voltage

generation

• Low-latency signal processing filter selection

• Programmable HPF and biquad digital filters

• Automatic gain controller (AGC)

• Voice activity detection (VAD)

• I2C control interface

• Integrated high-performance audio PLL

• Automatic clock divider setting configurations

• Audio serial data interface:

– Format: TDM, I2S, or left-justified (LJ)

– Word length: 16 bits, 20 bits, 24 bits, or 32 bits

– Master or slave interface

• Single-supply operation: 3.3 V or 1.8 V

• I/O-supply operation: 3.3 V or 1.8 V

• Power consumption for 1.8-V AVDD supply:

– 9.5 mW/channel at 48-kHz sample rate

2 Applications

• Automotive Active Noise Cancellation

• Automotive Head Unit

• Rear Seat Entertainment

• Digital Cockpit Processing Unit

• Telematics Control Unit

3 Description

The PCM3120-Q1 is a Burr-Brown™ highperformance,

audio analog-to-digital converter (ADC)

that supports simultaneous sampling of up to two

analog channels or four digital channels for the

pulse density modulation (PDM) microphone input.

The device supports line and microphone inputs, and

allows for both single-ended and differential input

configurations. The device integrates programmable

channel gain, digital volume control, a programmable

microphone bias voltage, a phase-locked loop (PLL),

a programmable high-pass filter (HPF), biquad filters,

low-latency filter modes, and allows for sample rates

up to 768 kHz. The device supports time-division

multiplexing (TDM), I2S, or left-justified (LJ) audio

formats, and can be controlled with the I2C interface.

These integrated high-performance features, along

with the ability to be powered from a single-supply

of 3.3 V or 1.8 V, make the device an excellent

choice for space-constrained audio systems in farfield

microphone recording applications.

The PCM3120-Q1 is specified from –40°C to +125°C,

and is offered in a 20-pin WQFN package.