Dual RF PLL Frequency Synthesizers like the ADF4208

[makoton2009]

Hi, does anyone can tell me what happen in a Dual RF PLL Frequency Synthesizers like the ADF4208 if for the RF in i have another carrier besides the desired signal. Which is the parameter that describe the ability of this kind of IC to discriminate an unwanted carrier, i guess it most be some parameter about the difference in amplitud between the wanted and unwanted signal, so this kind of ICs can choose without any problems the right frequency to work OK.

Thanks.