I have a concern to Vref for AD5685.
Of course I was compliance with the rules of the absolute maximum rating.
In power up sequence, AD5685 internal reference was enable.
But in circuit external 3.0V reference supplied to AD5685.
After a few sec AD5685 internal reference was disable.
But in datasheet Vref impedance was 0.04ohm.
I am concerned about this internal Vref circuit was broken at the power up sequence..
Because, if a current flows into the internal reference