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The ground pins on the upper half of the part (like rows 10-14) seem like they really want to be analog ground since that is where the AVDD22, AVDD18, and INA_P/N powers and IF are. What would happen if those GND pins surrounding those analog powers and IF are tied to AGND? If there a barrier from ground on the top half of the part versus all digital on the bottom of the part? Or something internal that connects AGND to DGND? I'm trying to understand why there's analog signals but no analog grounds provided for the analog signals.
Hi Kerry,
All grounds pins for the ADC should be tied to one reference plane or ground on the pcb. We do not recommend splitting or referring different parts of the ADC to different ground planes.
There is nothing internal to the device that divides the ground planes either.
Regards,
Rob
Thank you. Is there any routing guidelines available? I had a few questions. Please see my other forum question today.
Hi Kerry,
You are welcome!
Yes, I answered this just now.
I will close this question out and please let me know if you have more questions.
Regards,
Rob