Stereo PDM to IS/TDM Converter

The ADAU7112 converts stereo pulse density modulation (PDM) bitstreams into one pulse code modulation (PCM) output stream. The source for the PDM data can be two microphones or other PDM sources. The PCM audio data is output on a serial audio interface port in either inter-IC serial (I2S) or time domain multiplexed (TDM) format.

The ADAU7112 is specified over the commercial temperature range (−40°C to +85°C). The ADAU7112 is available in a halide-free, 9-ball, 1.26 mm × 1.26 mm, 0.4 mm pitch, wafer level chip scale package (WLCSP).

Applications

* Mobile computing

* Portable electronics

* Consumer electronics

* Professional electronics

* 2 channels of PDM audio inputs from digital microphones

* 64× decimation ratio of PDM to PCM audio data

* 24-bit resolution to support high sound pressure level (SPL) microphones

* 126 dB A-weighted SNR

* 4 kHz to 96 kHz output sampling rate

* Bit clock rates of 64×, 128×, 192×, 256×, 384×, or 512× the output sampling rate

* Automatic PDM clock generation

* Automatic power-down when BCLK is removed