ADG888: Decoupling audio ground from power GND

Question

Dear all, 
 the following schematic is for processing signals from/to different audio sources. 
 It uses a couple of ADG888 for the audio switching function, and a simple debouncer (MAX6816) to have a better control. 
 The question: is it better to keep the audio ground line separated from the main power supply GND ? Or is it mandatory? 
 Thank you for your idea! 
 M

ADIApproved · Accepted Answer

Hello Massimo, 
 The ADG888 is a single supply part and cannot take a signal that is below its lowest supply rail, which is GND. Please see my previous reply about the Absolute Maximum ratings. The input pins are protected from ESD using diodes to the rails, when a signal goes beyond the rails, this can turn on these diodes and potentially cause damage. 
 Regards, 
 Sean)

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ADG888: Decoupling audio ground from power GND