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AD5317R and external reference

Question asked by Mochi on Sep 14, 2017
Latest reply on Sep 14, 2017 by isantos

My customers are planning to use the AD5317R with an external reference.
I already got advice on this matter once. (Thank you)
This is a question again.

The customer devised the following circuit.
Perhaps the internal circuit is not as expected and it may not work well.
In the block diagram, no reference buffer is drawn.
As expected, it will contribute to circuit simplification.


We want to simplify the circuit.


When “Internal reference” is selected,

if X=, VREF2=+2.499999V.

When “External reference” is selected,

if X=, VREF2=+5V.


How many ohm is the resistor X?


Best regards