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Topic: AD620 amplifier (Read 102 times) previous topic - next topic

petraCCNE

Jul 17, 2018, 02:46 pm Last Edit: Jul 17, 2018, 09:16 pm by petraCCNE
Hey I'm working on AD620 amplifier to amplify the 100mv max output of (TGS6812-D00 methane gas sensor) analog voltage to 1.1v
two supply voltages
Vs =1.1v and vs=2.3v
Voutmin=-Vs+1.1=-1.1+1.1=0v
Voutmax=Vs-1.2=2.3-1.2=1.1v

the pin 4 (-Vs ) will be connected to the ground
the pin 3 will be connected to the dc power supply of 2.3v
the pin 4 will be connected to the dc power supply of 1.1v
is that correct till here?
I calculated the gain and it is 11 so i need a resistor of 4.94kohm from pin 1 to pin 8 of the amplifier
Rg=49.4kohm/11-1

I'm new with amplifier and i dont know which input of amplifier should i use (it is the inverting input or non inverting input?) and what do i do with the pin of Vreference?

and i need the voltage at the ad620 output to be positive because i'm gonna connect the output of amplifier to arduino uno
And thank you

The datasheet of the amplifier:

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