I'm reading the datasheet of TL331. Here a summary of the relevant specification for my question:
ABSOLUTE MAXIMUM RATINGS VCC Supply voltage 36 V VID Differential input voltage ±36 V VI Input voltage range (either input) –0.3 V to 36 V ELECTRICAL CHARACTERISTICS VICR Common-mode input voltage 0 to VCC – 1.5 V
with this note:
[...] The upper end of the commonmode voltage range is VCC+ – 1.5 V at 25ºC, but either or both inputs can go to 30 V without damage.
I'm going to use this component as a comparator (i.e. without any feedback) in this situation:
- single power supply: 12V
- IN-: 9V
- IN+: 18V
Now, the absolute maximum ratings are satisfied and also the second clause of the note. But the common-mode voltage is 13.5V, and this is outside the specification (VCC-1.5V = 10.5V).
So, I cannot use this amplifier at all? Or, because I'm going to use it as a comparator it would work anyway? I mean, the outputs would saturate without actually be able to make V+ = V-.