Just a quick (fingers crossed ) whiz about diff op amps (again).
Was running into a situation with my single supply op amp on 5v (inv and non inv gain both 3.9) where it was outputting 0v when it should have been saturated.
Working great under conditions where input voltage diff is about 0-1.5 v but in one operating situation where voltage difference is say up to 8v and i would have thought output would have been right up against the supply (maybe im delduded) but instead its outputting 0v.
The reason is that i want it to have that kind of resolution when input difference is say ~1v. It doesnt need to deal with 8v difference....but it does need to show that it's 'off the scale' so to speak.
Its a MAX4389 just btw if that would make any difference.
Basically just wondering if this is supposed to happen with amps or whether it might be some other issue with the rest of the circuitry.
Thanks for reading (if you have been)
D
Was running into a situation with my single supply op amp on 5v (inv and non inv gain both 3.9) where it was outputting 0v when it should have been saturated.
Working great under conditions where input voltage diff is about 0-1.5 v but in one operating situation where voltage difference is say up to 8v and i would have thought output would have been right up against the supply (maybe im delduded) but instead its outputting 0v.
The reason is that i want it to have that kind of resolution when input difference is say ~1v. It doesnt need to deal with 8v difference....but it does need to show that it's 'off the scale' so to speak.
Its a MAX4389 just btw if that would make any difference.
Basically just wondering if this is supposed to happen with amps or whether it might be some other issue with the rest of the circuitry.
Thanks for reading (if you have been)
D