Voltage drop in Analog inputs due to long traces length
The minimum input impedance offered by the ADS1278 is 14kohm and if your traces were so long that they were ten ohms, the attenuation at DC would be 14,000/14,010 = 0.9993 or 6.2 milli decibels.

10 ohms of copper trace is many metres long BTW.

A 0.5mm wide trace on 1 oz copper is 9.71 ohms at 10m length. See this calculator