Hi Alex, May I clarify what the out error I meant? The error is not simple DC offset error but output is fluctuated like AC offset. I think that root cause is still same that ADS1248 does not have full differential switched capacitor architecture. May I have another question, Why external REFP connection can fix the common mode impact issue? I am understanding blow connection. It is the way you advised to fix, right? Best regards, Masa
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