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ADS1298 signals offset

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Hello,

I am using ADS1298  for ECG acquisition with the following configuration:

AVDD=+2.5V and AVSS=-2.5V,

internal reference of +4V

internal clock

WCT A.B.C on

I've acquired same signal with 3 different samples and the offset is always different. The calculated Vpp of each signal is the same for the  3 samples, but not the de DC. Is that correct. I also compared it with the evaluation kit I’ve got and the offset is also different,

Should them all be equal? Do you know the possible reason for such difference?

 

Thank you for your help.

Gina


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