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ADS1292R Bipolar Supply Respirations

Other Parts Discussed in Thread: ADS1292R

Hello,

     I'm currently trying to get respirations off the ADS1292R using the circuit described in page 58 of the spec sheet. I tried it with a 0-3.3V analog supply, and it worked fine. However, when I set the analog supply to -2.5V to 2.5V, and changed the capacitor for PGA1N and PGA1P to 47 nF, as described on page 61 of the spec sheet, I can no longer get respirations. Is there any configuration that I should be using? I tried all the permutations of the phase delay, 32 Khz, 64 Khz, and gain.

Thanks for any help,

George