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ADS8028: Layout recommendations (Grounding)

Part Number: ADS8028


a customer is looking for layout recommendations how to layout GND for ads8028.

We have split supply for ADS8028, AGND and DGND

Is it recommended to layout a smaller AGND area and connect the AGND area to the larger GND at a single point ?

Which location is preferred for the single point connection ?

Or is it better to avoid a separate AGND plane ?

Regarding bypass capacitors. Recommended to decoupling? 

* REF to AGND(6),

* AVDD(10) to DGND(9)

* DVDD(16) to GND plane