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ADG 729 Grounding Recommendation

I am using the ADG 729 to route audio signals- is there a recommended way to ground/layoutthe 729 (or any I2C/SPI controlled analog mux for that matter) as to prevent contamination of the audio signal from the I2C portion? I have digital and analog ground planes- would it be wiser to connect to one or the other?

Thanks!

-Lars