ADCs are mixed-signal devices. For maximum performance, proper decoupling, grounding, and proper termination of digital signals is essential. Figure 55 shows the essential components around the ADC. All capacitors shown are ceramic. These decoupling capacitors must be placed close to the respective signal pins.
There is a 47-Ω source series termination resistor shown on the SDO signal. This resistor must be placed as close to pin 15 as possible. Series terminations for SCLK and CS must be placed close to the host.