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Original question:

DAC81404: DAC81404 Layout

DAC81404: Layout: Split analog and digital ground?

mmg IPG
Prodigy 90 points
Part Number: DAC81404

Hi,

I would like to understand better when and how to use split ground planes for layout using the DAC81404.
In the datasheet, a split ground plane with a single connection is recommended.

In this other post it is stated that a single solid ground plane is OK.

In my design, I have a +/-14V supply connected to AVDD & AVSS.
I have also a 5V supply which is connected to IOVDD & DVDD.

In this case, would it be an improvement to separate the ground planes?

Thanks,
Marcel

  • +1
    TI__Guru 53773 points

    Generally, I recommend a grounding strategy as described by Henry Ott (good person to look up for EMC and grounding).  Basically, you layout the board with a different AGND and DGND, taking care to place components in their ground plane and ensure that all ground pins had a good return path to the supply source.  Once the board is completely routed, you then unify the grounds into a single plane.  This ensures that any accidental or difficult return paths are optimized.