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In-Amp AD8221 Ref. Clarification

Question asked by dhareppa@z on Mar 14, 2017
Latest reply on Jun 30, 2017 by harryh


Planning to use AD8221 IC as bridge amplifier. Schematic is attached, supply is ±15V, Gain is 495 and ref pin is connected to GND.

Question is,

Since, op-amp is biased with ±15V, operating at high gain (i.e.500) and ref pin connected GND.

Will it affects the output? or Shall we need to tie the Ref pin to a potential?

What is the guaranteed CMRR at low level input (i.e. 1mV, 2mV etc) ?


Thanking you and awaiting expeditious reply.



Dhareppa Z