I need to route the sound to and from a PCM2912A to a telephone built with AS2522. The telephone has a differential mike input and mono audio output, designed to connecto to a typical telephone handset:
The PCM2912 has stereo outputs and a mike input, designed to interface with a typical headset:
Both chips expect input from electret microphones.
What would be the easiest way to mix the stereo outputs of the PCM2912 to the input of AS2522, and the single ended output of the PCM2912 to the differential input of the AS2522?