SBASA74B January 2023 – May 2024 ADS9218 , ADS9219
PRODMIX
Figure 8-11 shows a board layout example for the ADS921x. Avoid crossing digital lines with the analog signal path and keep the analog input signals and the reference signals away from noise sources. Use 0.1μF ceramic bypass capacitors in close proximity to the analog (AVDD_5V and VDD_1V8), and digital (VDD_1V8) power-supply pins. Avoid placing vias between the power-supply pins and the bypass capacitors. Place the reference decoupling capacitor close to the device REFIO and REFM pins. Avoid placing vias between the REFIO pin and the bypass capacitors. Connect the GND and REFM pins to a ground plane using short, low-impedance paths.