Instrumentation op amp on single supply

treez · Sep 21, 2015

Hello,
we are using AD8293 IN amp (AD8293) to amplify signal from honeywell TBP010BG pressure sensor.

We feed 0-5V supply to AD8293.
Do you believe we get common mode input range of 0V to 3.3V, and the output voltage will sit on top of the 0.8V reference that we feed to the AD8293?

AD8293:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD8293G80_160.pdf

crutschow · Sep 21, 2015

I think that should work, but I need to see a circuit diagram to be certain.

treez · Sep 21, 2015

we just thought if the output is sitting on 0.8v, then maybe the inputs wont see anything below 0.8v...just a kind of crazy idea we worried on.

crutschow · Sep 21, 2015

If you are referring to the output offset pin, that simply controls the quiescent DC level of the output signal, it has no effect on the voltage levels detected at the input.

treez · Sep 21, 2015

thanks, and if we put 0.8v ref in, then the (input voltage x gain) in volts, will be added on top of the 0.8v?

crutschow · Sep 21, 2015

treez said:
thanks, and if we put 0.8v ref in, then the (input voltage x gain) in volts, will be added on top of the 0.8v?

That should be true.

Instrumentation op amp on single supply

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