Other Parts Discussed in Thread: LMC6492, LMC6062, LMP7716, LMP7712, LMC6482
My company currently makes a pH meter using the LMP91200, and it works very well. As part of a lifecycle management exercise, I am redesigning a the circuit to use a traditional dual op-amp rather than the LMP91200. I don't need the VREF divider, and I will feed the VCM buffer (as a follower) with a 512mV reference voltage at the non-inverting terminal. I know the pH buffer needs to have an extremely low input bias current due to the ultra low current (fA-pA) coming from the probe INP. Ideally, I'd like to use a dual OpAmp for convenience. I was considering the following: LMC6082, LMC6492, LMP2232, and LMC6482. Are these appropriate and am I missing anything?
