Thanks for the response. We're using the ADR3425 for REFIN. Please see the attached image. Just a note about the schematic: the AAFx components are hierarchical blocks containing a programmable filter circuit.
Here is the answer I got "We only have a spice model for the ADR3425 (the 2.5V output version of this family). It is used as an example of behavior. Other voltages behave similarly." The spice models are available at: