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AD8293G80 , Is it possible to change the gain by adding external resistor?

Question asked by Jaimes on Nov 5, 2012
Latest reply on Nov 7, 2012 by Gustavo.Castro

Hi There,

 

I am considering using a AD8293G80 as the front end for a DC current sensor, but I need a gain of ~50 rather than the preset gain of 80.

 

This amplifier has provision for adding an external filter capacitor to roll-off the gain, and according to the datasheet diagram that seems to be connected right across the amplifier feedback resistor.

 

Would it be possible to connect and external resistor in parallel with the filter capacitor to modify the DC gain for the amplifier without any major ill effects?

And if so, what would be a good TC spec ( ppm/C ) for the external resistor to approximate that of the internal resistor?

 

Thanks in advance for your help.

 

James

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