What is the input/protection structure of the LINP/LINN/RINP/RINN/LAUX/RAUX pins of the ADAU1761? Are clamping diodes integrated? If so, what sort of current can they be subjected to? Do I need external diode clamps?
Also, what is the input impedance of the above pins? The datasheet lists it in terms of the PGA gain, but what if I'm not using the PGAs? And what about LAUX/RAUX?