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AD1974 input

Question asked by ak1000 on Oct 23, 2012
Latest reply on Oct 23, 2012 by ColemanR

Hello,

 

I am using the AD1974 input filter circuit as described on page 23 of the datasheet with the exact passive values, but with an ADA4075-2 op-amp instead.  What is the corner frequency of this circuit and can you provide the design equations for it so I can confirm with mine? I also noticed a slight difference in this circuit from the AD1974 eval board.  The 4.7uF caps are 47uF on the eval and the bottom 120pF cap is missing on the eval board. Which is the properly recommended circuit?

 

Thanks

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