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Using a Digital Input for an Additional Control Potentiometer

I'm using an ADAU1701 and I essentially need 5 AUX ADC controls (5 different control pots) I'm using the 4 AUX ADCs already, so I just need one more (I'm already using both audio ADC inputs) I assume this is simple enough by using one of the serial data inputs and using the output master clocks to clock the external ADC, but I'm not quite sure how to approach it. Does anyone have a suggestion of a specific ADC part number to use? Serial data confuses me somewhat so I never know what specifications I need. The more instructions you can give me, the better.

Thanks a lot.