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Amplification from the additional Rref Is Very Annoying

Question asked by TNg3 on Jul 5, 2018
Latest reply on Jul 15, 2018 by Emman.A

I'm using AD8222 in my sensor design where it is used to interface with Wheatstone bridge. On the prototype, +IN1 and -IN1 are tied together to fix 2.50000V.  +Vs is set to 12.0v and -Vs is set to 0v. REF1 is tied to a unity buffer op-amp (REF495) with a voltage of 2.5V. The gain setting is 351 with RG1 set at 141 ohm.

Theoretically, i would expect the OUT1 of 2.50000V. However, there is always an additional amplification of 0.02V. I suspect this comes from the amplification from the additional Rref. How can i get rid of the additional amplification of 0.02V. i attach the circuitry of the design.