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ADC Star ground with motherboard topology

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Hi All,

 

I have an ADC layout I've been testing. The ADC board itself is a 1" square. On the ADC board I've used a star ground topology.

The ADC board connects to a motherboard with AGND and DGND between the ADC board and motherboard.

 

My concern is that I have the star ground on the ADC board and not the motherboard.

 

Is this okay? Should the star ground point be on the motherboard instead of the ADC board?

 

let me know if you would like any more details

 

Any help is appreciated

Thanks

Sam


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