OP90 used as inamp

Document created by analog-archivist Employee on Feb 23, 2016
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Please explain how to use OP90 as instrumentation amplifier as shown in figure
11 of it's datasheet Rev C.


This is a funky application where they use the Vos pins to unbalance the front
end and then provide feedback on the other Vos pin.
The OP90( released 1986) has been around for a long number of years, so I would
be inclined use a more recent InAmp device instead, such as the AD8237, AD8235,
or AD8236. Or alternatively roll your own with two or three op amps depending
on gain/bandwidth/supply current needed.