I do not use internal ADC and DAC in my ADAU1701 application. How to connect ADC and DAC pins?
I suppose these pins could be left opened:
In order to keep everything stable and quiet i would use the recommended 18K resistor on the ADC_RES pin to ground. I would use the recommended decoupling on the FILTA, FILTD and CM pins. You should definitely decouple and power AVDD for normal operation.
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