I want to use 1 ADA4522-2 or 2 ADA4522-1 as unity gain buffer for 30V and 48V. To test the ADA4522-1 I created a minimal setup (see attached schematic). While I have 25.1491V on +IN, I get 25.1848V on -IN. That means an offset of 35.7mV. In the datasheet the ADA4522-1 promises an offset voltage of maximum 5uV. I tried two different chips and buffer setups with different input - and supply voltages but, I always get offset voltages of 35.7mV and above. I tried to follow the application notes for the buffer setup given in the datasheet, but it didn't work out. For my design I need small offset voltage (< 1mV). Am I missing something.
I hope that you will help me to identify the issue.