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ADS1292: ADS1292(s): Grounding. Connect GNDs to different or same grounds?

Part Number: ADS1292


Hi,

The ADS1292(s) has different ground pins. 

I wanna connect these to different ground plains (analog ground and digital ground).
This is fatal when these ground pins are internally connected in the IC.

Are these ground pins internally connected or not?

Thank you very much
Fabian