Dynamic currents are also present at the ADC analog inputs (pins 18 and 19) of the ADS816x. Use C0G- or NPO-type capacitors to decouple these inputs. With these type of capacitors, capacitance remains almost constant over the full input voltage range. Lower-quality capacitors (such as X5R and X7R) have large capacitance changes over the full input voltage range that may cause degradation in device performance.
In Figure 108, each multiplexer input has an RC filter that helps reduce settling when switching between multiplexer channels. When not switching the multiplexer, as discussed in Figure 43 and Figure 44, the RC filter can be omitted.