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AD7626 GND configuration

Question asked by houly on Jul 6, 2012
Latest reply on Jul 6, 2012 by harryh

Hello

I have a multilayer PCB (10 layers) with analog preamp on the top and digital parts (6 * AD726) on the bottom side.

I have a GND for the analog preamp in inner1 layer and another GND plane on the int8

All VDD1-VDD2 and VIO supply rails are on inner 6 layer.

All the ground planes are sharing in one point on the power supply connector. My question is for the VDD1 (analog supply rail of the ADC) and external reference+buffer (which are also on the bottom side) do I rather use the "analog" ground in inner1 or the digital one in inner8 ?

 

In fact, I wanted to have a ground plane for all components of the bottom layer :  reference + buffer + ADC, but since there are analog and digital, I'm wondering if it's the good way ?

 

On the AD7626, which GND pins needs to be connected to the "digital" GND plane ? and another to the analog GND plane ? or can leave this as is it ?

 

regards

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