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AD9265 input impedance

Question asked by Jona on Feb 18, 2017
Latest reply on Feb 18, 2017 by PMH

Hi,

 

what input resistance may I assume for the AD9265 in the range 0 to 50 MHz ? It is 6 kOhm in the datasheet, but it appears higher (almost 18 kOhm at about 15 MHz and quite variable with frequency ) from the following  Excel file(see attached plot):

 

 www.analog.com/media/en/simulation-models/s-parameters/AD9265-55.S-Parameter.xls

 

Besides, is it correct to assume 4 pF, in the same frequency range, for the differential input capacitance,  originating from the series of the two 8 pF capacitances that are, as per the datasheet,  between the differential input pins and AGDN?

 

Regards,

Jona

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