Hi,
I find I hard to choose a OpAmp for my project. What I need is a bipolar to unipolar OpAmp that reads ±0.1V on the input and puts out a voltage between 0 - 3.3V
Can someone help me guide me trough the datasheets of give an example OpAmp that would suite these requirements.
Thank you
Luc
Luc,
Your input signal is 200mV range and output range is 3.3V, therefore the gain will need to be 3.3V/200mV = +16.5
For a 1% error due to input offset error requires a Vio maximum of 200mV*1% = 2mV or less.
Low noise is also helpful for small input voltages. LMV751 is one option.
Here is a low component count example. Largest sources of error are op amp Vio, 3.3V tolerance, resistor tolerance.
