Hello!
I am currently trying to implement the OPA2355 as a buffer. Since the OPA2355 has two amps (A & B) in the chip, it will have two inputs, as well as two outputs that will feed into the THS4531 differential amplifier, which then feeds into the ADS8354 ADC.
I have already verified that my diff. amp works correctly, however, my issue arises with the OPA2355 in the fact that when I apply a small input voltage to the inputs of OPA2355, lets say 2mV, the differential output does not coincide with unity gain. The circuit uses simple negative feedback. Below is a TINA screen shot of the basic buffer circuit I am trying to implement. The documentation says that the enable pins can be left open to assume TTL high and therefore fully enable the amps. Is there something else I may be missing?
Thank you!
Denver