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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  • Hi Richard

    Many thanks for your reply.

    I'm just confused because I previously asked if ADM2578E and ADM3251E could share a ISO GND and the answer was that this would not be a problem.  Going by the logic of the recent answer then surely this would not be ok?

    Regards

    David

    13/06/2014 - ADM3251E and ADM2587E GNDs

    created by in Interface and Isolation - View the full discussion


    Hi David,

    If you refer to the part datasheets, then:

    For the ADM2587E (page 7) when you are stating GND - do you mean GND2?

    For the ADM3251E (page 8) when you are stating GND - do you mean GNDiso?

    If both parts share the same isolated ground then that is ok.

    i.e. Ground 2 and GNDiso sharing then the same ground connection.

    Regards,

    Richard

Reply
  • Hi Richard

    Many thanks for your reply.

    I'm just confused because I previously asked if ADM2578E and ADM3251E could share a ISO GND and the answer was that this would not be a problem.  Going by the logic of the recent answer then surely this would not be ok?

    Regards

    David

    13/06/2014 - ADM3251E and ADM2587E GNDs

    created by in Interface and Isolation - View the full discussion


    Hi David,

    If you refer to the part datasheets, then:

    For the ADM2587E (page 7) when you are stating GND - do you mean GND2?

    For the ADM3251E (page 8) when you are stating GND - do you mean GNDiso?

    If both parts share the same isolated ground then that is ok.

    i.e. Ground 2 and GNDiso sharing then the same ground connection.

    Regards,

    Richard

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