1 Features

• Multichannel high-performance ADC:

– 4-channel analog microphones or line-in,

– 8-channel digital PDM microphones, or

– Combination of analog and digital microphones

• ADC line and microphone differential input

performance:

– Dynamic range (DR): 106 dB

•

– THD+N: –98 dB

• ADC channel summing mode, DR performance:

– 109-dB, 2-channel summing

– 112-dB, 4-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, 1-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)

• I2C or SPI controls

• 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

– Controller or target 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:

– 8.5 mW/channel at 16-kHz sample rate

– 9.2 mW/channel at 48-kHz sample rate

2 Applications

• Microphone array systems

• Voice-activated digital assistants

• Teleconferencing systems

• Security and surveillance systems

3 Description

The PCM3140-Q1 is a Burr-Brown™ highperformance,

audio analog-to-digital converter (ADC)

that supports simultaneous sampling of up to four

analog channelsor eight 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 programable

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 , and allows for sample rates up to 192

kHz. The device supports time-division multiplexing

(TDM), I2S, or left-justified (LJ) audio formats, and

can be controlled with either the I2C or SPI 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 PCM3140-Q1 is specified from –40°C to +125°C,

and is offered in a 24-pin WQFN package.