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ADG888: Decoupling audio ground from power GND

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

audioswitch2.pdf
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  • Hello Massimo,

    There is not a particular way to connect the ADG4613 to allow the negative voltage signal. It will be the same as normal single supply connection:

    • VDD should be connected to your positive rail.
    • VSS and GND should be connected to your ground reference.

    You can see the typical on resistance profile of the switch channel using a single supply at 5V and the signal range range sweeping between -5.5V and 5V in Figure 5 of the datasheet, under the Typical Performance Characteristics.

    Regards,

    Sean

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  • Hello Massimo,

    There is not a particular way to connect the ADG4613 to allow the negative voltage signal. It will be the same as normal single supply connection:

    • VDD should be connected to your positive rail.
    • VSS and GND should be connected to your ground reference.

    You can see the typical on resistance profile of the switch channel using a single supply at 5V and the signal range range sweeping between -5.5V and 5V in Figure 5 of the datasheet, under the Typical Performance Characteristics.

    Regards,

    Sean

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