Four-channel PDM-input to TDM- or I²S-output converter

The PCMD3140 is a high-performance,

pulse-density-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 left-justified (LJ) audio

formats, and can be controlled with the I2C interface. Additionally, the

PCMD3140 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 space-constrained audio systems in far-field microphone recording

applications.

The PCMD3140 is specified from –40°C

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