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ADS1299: asymmetric supply and CMRR degradation

Other Parts Discussed in Thread: ADS1299

The ADS1299 can be powerd by unipolar or bipolar supplies from 4.75-5.25V

Question: To which extent does the CMRR performance degrade when the ADS1299 is powered by an asymmetric bipolar supply - such as +2.7, -2.55V or even more? Can you name any bounds or confirm with experience that small asymmetries do not have appreciable impacts?