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ADS1298: ADS1298

Part Number: ADS1298

what is the SNR of an ADC whose reference Voltage is 4.096V but the maximum applied actual signal does never exceed +/-20mV. The PGA gain setting is at 4 and the ADC Input referred Noise is 22uV. Should I use 4.096  or 14.14mV or 56.56mV as the signal amplitude for the SNR calculation ?