Other Parts Discussed in Thread: ADS1299
Dear,
I did a design with ADS1299 and the CMRR results for CMRR were less than -80 dB while datasheet give -110 dB for this parameter.
With some tests, I noticed that routing has influence on CMRR reduction. For exemple, applying a commom voltage as near as possible of ADS1299 pins I had CMRR near -100 dB. But to do this I jumped all filters and protections at the input.
Do you have any application note about impedance control and other parameters that I need to pay attention during schematic and PCB design to keep CMRR as high as possible? I couldn't find it during research.
Regards,
Zanetti