I did the Pace detection as mentionned in the TIPD111. Instead of 5V, I supplied the circuit to 3.3V.
This circuit is connected the PACE_OUT ADS1294R chipset.
I attached a scope where the channel 1 is ECG+Pace and channel 2 is the voltage at the OPA348.
With the whaletek tool, I can manage the Pace pulse voltage and duration.
Due to the strange singl on the Channel 2, I am not able to detect PACE level below 50mV.
I used exactly the same value mentionned in document.
Do you have an idea about the strange signal seen on channel2?
Due to the starnge signal on the OPA348 output signal, I can't decrease the pace level until 2mV. How to clean this?