Hello,

I have a question about "S-Parameter" file which is linked from AD9645 product page.

www.analog.com/.../AD9645_S-Parameter.xls

This file is not a S-Parameter but a calculation tool to see input impedance.

I'd like to confirm how to use this.

In the AD9645_AINDIFFZ" tab , "R-Math" cell and "jX-Math" cell will be set and then it calculate series resistance and series capacitance, I understood it. (Simaltanously parallel resistance and parallel capacitance are calculated)

Q1. I think the "R-Math" and "jX-Math" are external parts for AD9645 input terminal. Is it correct my understanding ?

Q2. AD9645 has a differential Input, so the series resistance are two like as "R" in figure 11 of the datasheet(Ref.C). The "R-Math" shoul be input the double value of "R" ?

Best regards,

y_suzuki