Should I use a solid ground plane or should I use split analog and digital planes?
Mixed signal chips usually used split ground planes, in theory this keeps the digital noise away from the sensitive analog.
But trial and error over the years has shown us the a single ground plane gives best results.
Our eval boards use a single ground plane.
The issue with separate ground planes is that if you don't do it right (cut outs, traces going across the split cause big loops in the return path etc) things get bad pretty fast.
Using seperate ground planes is ideal if it can be handled correctly; need to connect digital ground pins to digital ground plane and the the digital ground plane connected to analog ground plane.
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