I am designing an audio board for mono voice (300 to 3000 Hz) to record to and playback from the CM3. I want to keep it as simple as possible and came across the AD74111 CODEC, but it doesn't seem to have a SPI or I2C connection. Does anyone have any experiance with this CODEC or have any suggestions. All of the CODECs that I have seen used woth the Pi are multi channel and Hi Fi, which I don't need. Thanks.