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AD5685 start up reference setting

Question asked by Osamu on Mar 6, 2015
Latest reply on Mar 19, 2015 by msamera



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



Best regards