What's the difference between MC33272 & AD8092

[danielzhu]

mc33272

I designed a detector with HSMS2825, and added an OP to amplify voltage. I found AD8092 would decrease the dynamic range of the output voltage produced by the detector, MC33272 wouldn't, why???

 

[House_Cat]

The short, simple, answer is that the two chips are entirely different. They weren't meant to be interchangable without circuit modifications.

If you look at the data sheets, the AD chip has an output swing of 0.02 to 2.98V into a 2k load returned to +1.5V - the MC chip has an output swing of 0.2 to 5V into a 2k load returned to 0.0V.

The input resistances, bias currents, source and sink currents, etc., are all orders of magnitude different between the two chips.