Hi,
I'm using INA101 (DIP package) for amplification of a 0-5 mV signal from a thermopile sensor. Power supply is at +/-12V, which is within the supply range mentioned in the datasheet. The circuit is made exactly as shown in the datasheet, with Rg = 40 ohms to set the gain=~1000. Offset is set to get an output voltage of 0.01V.
At first, everything works fine and my output voltage equals I/P x 1000. Few mins later, the set offset voltage suddenly increases to ~0.30V at the output (Input remains the same) and heating the thermopile sensor again will only give me an maximum output of ~1V, when I/P equals 5mV. I can't figure out the reason for what might be wrong. I have also failed to understand what rated output voltage means in the datasheet. Can the reason for the problem be the the failure of output to fall within the mentioned range?
Please help me with the same.
Regards,
Deep.
