I have an opamp setup in a voltage follower (buffer) configuration with the input
voltage tied to the '+' channel well between the supply rails of the opamp.
This is for an essentially DC application-- a buffer for an A/D vref line.
My application has to have extremely good long term stability, and in the
context of this buffer, I want to make sure that the input voltage always follows
the output voltage as precisely as possible. Will this still be the case after
temperature cycling from -40 to +85 deg C, vibration, and aging in general?
The circuit is set up ratiometrically, but at this point I'm afraid this vref buffer
could introduce long-term offet/ratiometric error.
(I'm potentially looking for a single supply opamp recommendation as well)
Any thoughts would be appreciated!
Thanks-
Andy