ADG1613 - how to handle the GND pin in mixed signal designs?

I'm about to use the ADG1613 in a single supply audio / mixed signal design. Vss is connected to the analog ground (0V), Vdd to the analog power rail (12V in this case). There also is a virtual GND for the opamps of the circuit (6V). The digital part consists of a microcontroller with a seperated 3.3V supply.

Now I'm wondering about the GND pin of the ADG switch. Should it be handled as a return path for the logic control inputs like a "digital ground" pin on an ADC? The datasheet entry is: "Ground (0V) Reference", which sounds more like a reference point where analog and digital ground is connected.

So I'm a little confused, may be someone can help me with this question?

Thanks a lot,

Mathias

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    •  Analog Employees 
    on Jan 10, 2016 7:18 PM

    Hi Mathias,

    I agree with Klaus. You see, GND pin is the reference of the level shifters and the power supply of the device.

    It is a good practice to connect the GND pin of the ADG1613 to the analog ground and properly power-up the device. To control the logic pins (A0, A1, A2, EN), you may connect them to a microcontroller as long as the analog and digital ground will be connected at some point in the system to create a close loop for current flow.

    Best Regards,

    May

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  • 0
    •  Analog Employees 
    on Jan 10, 2016 7:18 PM

    Hi Mathias,

    I agree with Klaus. You see, GND pin is the reference of the level shifters and the power supply of the device.

    It is a good practice to connect the GND pin of the ADG1613 to the analog ground and properly power-up the device. To control the logic pins (A0, A1, A2, EN), you may connect them to a microcontroller as long as the analog and digital ground will be connected at some point in the system to create a close loop for current flow.

    Best Regards,

    May

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