SBASAG2 December 2023 ADS9227
ADVMIX
An external 4.096-V reference voltage can be connected at the REFIO pin with an appropriate decoupling capacitor placed between the REFIO and REFM pins. For improved thermal drift performance, the REF7040 is recommended. To disable the internal reference, set PD_REF = 1b in address 0xC1 in register bank 1. The REFIO pin has electrostatic discharge (ESD) protection diodes connected to the AVDD_5V and REFM pins. Figure 6-3 shows an external reference diagram.