ADM3251, ADM2578, ADM3053

Hi

I am using a ADM3251, ADM2578 and a ADM3053 in my design.

I am a little short of connections out from my enclosure.  I have designed my PCB with no GND for the ADM3053 which I now realise is a mistake - I will shortly redesign this to resolve this issue.  I previously connected Analog and I was told it would be OK to connect the GNDs on the ADM3251 and the ADM2578 on the output side ie the isolated GNDs.  My question is is it OK to connect all of the isolated GNDs together on the 3 devices?  This would mean the RS232, RS422, CAN interfaces would share the same GND connection leading out from my device (is connecting the isolated GNDs together).  In my application only one interface can be used at a time ie RS232, RS422 or CAN bus.

David

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  • 0
    •  Analog Employees 
    on Jan 19, 2016 11:38 AM

    Hi David,

    Sorry, to clarify;

    1. Yes the ADM2587E, ADM3053, and ADM3251E can all share the same GND2.

    This is assuming that the PCB accepts only 1 bus input signal at any one time.

    From your comment above this is true.

    2. Using separate GND2 fills for each part will be better from a radiated emissions point of view. Do you need to meet any radiated emissions targets ?

    Regards,

    Richard

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  • 0
    •  Analog Employees 
    on Jan 19, 2016 11:38 AM

    Hi David,

    Sorry, to clarify;

    1. Yes the ADM2587E, ADM3053, and ADM3251E can all share the same GND2.

    This is assuming that the PCB accepts only 1 bus input signal at any one time.

    From your comment above this is true.

    2. Using separate GND2 fills for each part will be better from a radiated emissions point of view. Do you need to meet any radiated emissions targets ?

    Regards,

    Richard

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