Hi,
I am using the ADS1110 via the I2C protocol to read voltages coming from an OP AMP (LMC662), but I noticed that the result is constantly 0.2V, which is incorrect, while the results coming from the analog pin of my microcontroller are correct. The ADS1110 will read voltages from a 10k ohm potentiometer just fine so I know it is working. Therefore, I assume it is a high output/low input impedance issue so I tried inserting a buffer in between the OP AMP and the ADS1110 but the buffer somehow amplified the voltage to 1.6V. The OP AMP I am using as the buffer is the LM324N.
Here is the schematic
I am not sure where to go from here.
Regards
Bunnarong