1 Features

? 4-channel PDM microphones simultaneous

conversion

? PDM input to TDM or I2S output converter

performance:

– 127-dB dynamic range (DR) with highperformance,

5th-order PDM input

– 117-dB dynamic range (DR) with highperformance,

4th-order PDM input

? Channel summing mode, DR performance with

high-performance, 4th-order PDM input:

– 120-dB, 2-channel summing

? Programmable PDM clock output:

– 768 kHz to 6.144 MHz

? Programmable output sample rate (fS):

– 8 kHz to 768 kHz

? Programmable channel settings:

– Digital volume control: –100 dB to 27 dB

– Gain calibration: 0.1-dB resolution

– Phase calibration: 163-ns resolution

? Microphone bias or supply voltage generation

? Voice activity detection (VAD)

? Low-latency signal processing filter selection

? Programmable HPF and biquad digital filters

? I2C control

? 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 supply:

– 2.8mW/channel at 16-kHz sample rate

– 3.6 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 PCMD3140-Q1 is a high-performance, pulsedensity-

modulation (PDM) input to time-division

multiplexing (TDM) or I2S output converter that

supports simultaneous sampling of up to four

digital channels for the PDM microphone input.

The device integrates programable digital volume

control, a microphone bias voltage, a phase-locked

loop (PLL), a programmable high-pass filter (HPF),

biquad filters, low-latency filter modes, and allows

for output sample rates up to 768 kHz. The device

supports time-division multiplexing (TDM), I2S, or leftjustified

(LJ) audio formats, and can be controlled

with the I2C interface. Additionally, the PCMD3140-

Q1 supports master and slave mode selection for

the audio bus interface operation. 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 spaceconstrained

audio systems in far-field microphone

recording applications.

The PCMD3140-Q1 is specified from –40°C to

+125°C, and is offered in a 20-pin WQFN package.