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ADS54J20EVM: The calculation of equal input impedance

Part Number: ADS54J20EVM

Hi Jim,

   I still have some doubts,please help me confirm this:

   1, In the section,as long as i choose the frequency of input signal,i can select the corresponding RC value and calculate the ZIN

   2,At this step i’m not sure whether to use the R&C value  to calculating by theR&C off-chip and ZIN

  For example,if the requirement of design  is 100Ohm input and the frequency is 100MHz,then we can  confirm the RIN is 900Ohm and CIN is4.75pF,so the ZIN equal to RIN || CIN and the value is 244Ohm。

  Therefore in order to get the 100Ohm input impedance the R value is 169Ohm(100Ohm = 169Ohm || 244Ohm),is that correct?