We are using both audio ADCs of the adau1701. The DSP program is a simple mux allowing us to use either the analog or serial inputs of the DSP (see picture).
We are using DIG0 and DIG1 to send both channels to a DAC.
On the output of the DAC we noticed a 40mV DC offset on the first channel and 55mV on the other when using the analog input. These offsets are not present when we use the serial input so this is not an issue with the DAC.
For reference this is the analog input schematic:
Adding a DC block module in SigmaStudio solves the issue but we wanted to know if these kind of values where common for this ADC.