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ADS1294: Mixed use of pace detection and AC lead off detection

Part Number: ADS1294


Hello, I have a question about the mixed use of pace detection and AC lead off detection.

Because I need to use dry electrodes in my scene, I need to choose an AC lead off detection scheme, and then I need to carry out pace detection. In order to capture the narrowest pulse, my sampling rate is configured as 32 K.

Datasheet says that the excitation of AC lead off detection is fs / 4, which is 8 K in my application. My problem is that I need to filter the excitation during pace detection. According to the standard, the range of pace detection is 2 ~ 700 MV. I find that when the amplitude of pace is very large, the notch filter will ring strongly. It will be very difficult to detect pace. Is there any way to deal with it?

Thanks very much!