I used AD8231 in our circuit as below picture (For +VS=5.06V supply, with nCS, A0, A1, A2,-VS to GND) , We have some issue when we test AD8231 as below:
1. We tried to short +INA and -INA , the outputA have 2.9mV offset , then I check parameter from AD8231 datasheet , Voso only 30uV , Is it normal?
2.We tried to used differently DC for test conditions then OUTA still has 20mV voltage drop.
Input INA+=30.0mV (DC)with INA-=GND, the OUTA=9.7mV (~20mV drop)
Input INA+=100.1mV (DC)with INA-=GND, the OUTA=79.0mV (~21mV drop)
Input INA+=200.0mV (DC)with INA-=GND, the OUTA=179.1mV (~21mV drop)
Is it normal?