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ADS1299: What's the function about Cfilt between Electrode 1 and Electrode 2 ?
The passive components RFilt and CFilt form low-pass filters. In general, the filter is advised to be formed by using a differential capacitor CFIlt that shunts the inputs rather than individual RC filters whose capacitors shunt to ground. The differential capacitor configuration significantly improves common-mode rejection because this approach removes dependence on component mismatch. The cutoff frequency for the filter can be placed well past the data rate of the ADC because of the delta-sigma ADC filter-then-decimate topology. Take care to prevent aliasing around the first repetition of the digital decimation filter response at fMOD. Assuming a 2.048-MHz fCLK, fMOD = 1.024 MHz. The value of RFilt has a minimum set by technical standards for medical electronics. The capacitor value must be set to arrange the proper cutoff frequency.
