I am designing a PCB based on the ADS1299 chip from TI, which is essentially an ADC with amps and some other functionalities.
I have seen a lot of emphasis on differential inputs into an amplifier to be symmetrical, as in their path being symmetrical. I assume that this will improve the common mode noise rejection ratio.
As a connector, I was thinking of having a 2-row, 8-pin header to save some space, for the analog input into the PCB, however this might cause slight asymmetry. Is it better to go with a 1-row header?
Further info: I am trying to measure EEG, which depending on the rhythm, would be in the range of 10's of microvolts, and from 0 to 100 Hz.