The particular chips mentioned by the OP include a specific front-end that provides the necessary signal conditioning. So it's a basic low-level balanced input that is designed to receive directly and electret of MEMS mic. It can also be used as a "line input" with limited headroom, which indeed requires additional conditioning to allow it to interface with conventional audio stuff. It would be some kind of attenuation and EMI/RFI protection. So you're absolutely right: "The ADC part of the question isn't really different than any other type of device."Generally you would want to put an instrumentation amp in front of an ADC chip to handle common mode noise and convert between traditional line levels and what the ADC device will expect.
Enter your email address to join: