I have an input signal with an amplitude of a few mV that I want to filter, amplify and then feed to an ADC ("Analog Signal").
The input signal (Coming though C1) is lifted at 2.5V and the range of the ADC is 0-1.25V. The ADC has a reference voltage pin of 1.25V (it's the LTC2470).
Until now I was using the Adjustable resistor R4 to center the output signal of the opamp by hand. But this solution is not elegant. I would like to remove R3, R4 and the +5V input and manage to center the output without external intervention.
How would you proceed to center the output signal of the opamp to about 1.25/2?