Dear colleague,
Our customer is using our ADS1294 to make I lead, but now it occasionally appears when the environmental interference is relatively large, and the measured ECG waveform has interference, as shown in the figure below, now they are looking for the reason. The hardware design of equipment refers to the EVM of ADS1294. Before the input signal enters ADS1294, it through magnetic beads, 1nf filter capacitor, and the following 22k and 47pF filter. Since ADS1294 has many resources, so they have more unused pins and connect all unused pins to VADD on the hardware.
The ECG waveform has been turned on after 35Hz filtering, and the frequency of sinusoidal waveform appearing in the part that should be smooth is about 20~33Hz.
Do you have some suggestions?
Best Regards,
Rock Su
