I got a couple of questions about ADuCM360:
You can't draw any current out of the Int_Ref pin.
It's only brought out on a pin so that the internal reference can be decoupled.
If you need to use it outside the chip you need to buffer it first.
In NPN mode the same reference is connected back internally to the chip into the DAC buffer so very little current is drawn out of the reference.
We have specs for the PSRR for the ADC and the reference which would be the most sensitive to power supply noise.
What are you worried about when it comes to the oscillator?