We are considering in the internal or external reference of AD9467, but there are two questions.
①What is the accuracy of the internal reference?
②How many current flowing to the XVREF of external reference?
The temperature specific information regarding the internal voltage reference is below
-40degC : 1.236V
25degC : 1.251V
85degC : 1.257V
The input resistance of the XVREF pin is very high. It drives the gate of a MOS device, which is practically a capacitive input. So the input current should just be leakage (~1uA or thereabouts). See figure 9 of the datasheet for an equivalent circuit of the XVREF input.
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