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AD 8220 GAIN

Question asked by Dzuro on Nov 26, 2012
Latest reply on Dec 22, 2012 by Dzuro

Hi,

I'm using the AD 8220 to amplify a voltage signal from a pressure sensor. The sensor has a very linear response without AD 8220 and a very non-linear response with the amplification as seen on the pictures attached.

What could be the souce of this non-linearity and the variable gain?

 

I am using the same power supply 5V for the AD8220 and the pressure sensor. The REF and V- pin are connected to the GND. I can not pinpoint the source of this variable GAIN. Does anybody have any ideas?

 

Thanks,

Dzuro.

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