AD5412 ref problems

Hi all!

I use AD5412 in my design in all modes (current and voltage) with internal reference. I use two ICs in daysi chane mode (both in the same mode the same time).

I got two problems:

1. In 2 of 8 ICs not working bipolar voltage mode, ie when i try to put on +/- 5 v it works like 0..10v another IC in the same PCB works fine.

2. 3 if 8 ICs have broken ref. It have more then 5.015 v and swing high with time.

I want to know if it manufacturing defect or it could be due to overheating during soldering.


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