I have one question about AD8233 In-Amp gain error.
In figure. 4 , Which condition is in below histogram VDIFF=0V or VDIFF=-300mV to+300mV ?
The Vdiff is 0V for this plot of histogram. May I know why are you concern on this? Usually for ECG, the gain error doesn't matter too much as long as you can separate your signal out of the noise. Absolute gain is not so important, especially when you start adding very narrow bandwidth filters which is common on this application.