I connect the AD8062AR to the AD5781ARUZ by following the instruction of AD5781ARUZ. What I want to achieve is to make the VREFNF to 0V. The diagram about negative connection is shown in below:
The connection about positive connection is shown in below:
In realistic the OPAMP I used is not AD8062 but LF412. During the test, the voltage of eight U3 pins I measured is shown as the list below:
We can see that the voltage of VREFNF is not 0V, but 0.48V. What caused?