SBAS991 February 2021 ADC3663
The analog inputs of ADC366x are intended to be driven differentially. Both AC coupling and DC coupling of the analog inputs is supported. The analog inputs are designed for an input common mode voltage of 0.95 V which must be provided externally on each input pin. DC-coupled input signals must have a common mode voltage that meets the device input common mode voltage range.
The equivalent input network diagram is shown in Figure 8-1. All four sampling switches, with on-resistance shown in red, are in same position (open or closed) simultaneously.