SBAS872 December 2020 ADC3683
The ADC368x is equipped with an on-chip reference buffer that also includes gain to generate the 1.6 V reference voltage from an external 1.2V reference. A 10 uF and a 0.1 uF ceramic bypass capacitor (CVREF) between the VREF and REFGND pins and a 10 uF and a 0.1 uF ceramic bypass capacitor between the REFBUF and REFGND pins are recommended. Both capacitors should be placed as close to the pins as possible. The load current from the external reference is less than 100uA.