We saw this TLV320 4-channel microphone ADC in an Echo Dot teardown and thought it looked like a handy I2S chip. You can have 4 PDM or analog microphones for input, and data comes out on a single stereo I2S channel with time division multiplexing. Four inputs are better than 2 when using microphones for voice array/location projects. This chip doesn’t need MCLK, so it would probably work better with a Raspberry Pi! The chip comes in a few flavors, with 106, 120, or 122 dB SNR (you pay more for the 122!) TLV320ADC5140 (as used in the Echo Dot) is in stock at DigiKey, and we’ll probably use that one.
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Tags: Adafruit, ADC, audiodevelopment, audioprocessing, audiorecording, audiotechnology, digitalaudio, electronicsdesign, embeddedengineering, hardwarehacking, i2s, makersgonnamake, micpreamp, microphonearray, PDM, raspberrypi, soundengineering, techcommunity, TLV320ADC — by phillip torrone
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