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LMX2592: Input frequency possible values

Part Number: LMX2592

Hi there!

Minimum possible value of the input signal frequency is 5 MHz according to SNAS646C. Table 1 shows boundaires for input path components.

The problem:

if I want to use input frequency 5 MHz (for example) I can't satisfy requirements of the multiplier (input frequency 40-70 MHz) with any possible values of doubler and pre-r divider. 

Similarly for the frequencies that are lower than 20 MHz.

So, why the lowest possible input frequency declared in datasheet is 5 MHz?

Thanks for your answers!