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ADS1292: ADS1292

Part Number: ADS1292

Hello,

I run an ADS1292 with bipolar voltage and I use an external reference.
The data sheet says that the VREFN pin must always be connected to AVSS.
I have found that the actual reference voltage is the sum of AVSS and external Refenece.
Can I connect the VREFN pin to ground? If not, how can I operate the ADS1292 so that the reference voltage in the ADC corresponds to the external reference voltage?

Thanks in advance