Analog Devices Inc. ADAU7112 Stereo PDM to PCM Converter

Analog Devices Inc. ADAU7112 Stereo PDM to PCM Converter provides up to two channels of decimation from a 1-bit out source to a 24-bit Pulse Code Modulation (PCM) audio output. The downsampling ratio is 64 × f_S, with f_S being the PCM output sampling rate. All channels decimate at the same ratio. The 24-bit downsampled PCM audio data is output via standard Inter-IC Serial (I²S) or Time Domain Multiplexed (TDM) format.

The input sources for the ADAU7112 can be any device that has a slave PDM output, such as a digital microphone. The output pins of these microphones can connect directly to the input pins of the ADAU7112.

The ADAU7112 Stereo PDM to PCM Converter is available in a halide-free, 9-ball, Wafer Level Chip Scale Package (WLCSP), and is specified over a commercial temperature range of -40°C to +85°C.

Features

2 Channels of PDM Audio Inputs from Digital Microphones
64x Decimation Ratio of PDM to PCM Audio Data
24-Bit Resolution to Support High Sound Pressure Level (SPL) Microphones
126dB A-Weighted Signal-to-Noise Ratio (SNR)
4kHz to 96kHz Output Sampling Rate
Bit Clock Rates of 64x, 128x, 192x, 256x, 384x, or 512x the output sampling rate
Automatic PDM Clock Generation
Automatic Power-Down when BCLK is Removed
0.36mA DVDD Operating Current at 48kHz Sampling Rate and 1.8V Supply
Slave I²S or TDM Output Interface