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Driving the reference pin

Question asked by gerard on Aug 8, 2012
Latest reply on Aug 9, 2012 by gerard

Hello,

 

In datasheet AD8421.pdf (figure 61) a buffer opamp is used to drive the reference pin. The AD8421 (10MHz BW) and the opamp buffer is an OP1177(1.3MHz BW). The BW of the buffer opamp is much lower will this work when applying frequencies above 1.3MHz at the inputs of A1 and A2? What will happen with the gain and CMRR?

 

Thanks,

Gerard

driving the reference pin.jpg

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