We are using the LMK04110 with 100M Hz as input with the same as output and the variation possible is 5600ppm. What should be my VCXO frequency?
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My understanding is that you are...
You have a few options for VCXO frequency. Since you are using a clocking device with an integer-N PLL, you want to pick a VCXO frequency that has a good integer relationship to the VCO frequency of your clocking device. Since you will use 1200 MHz for the VCO frequency, I suggest...
The problem you will run into, is the tuning range of the VCXO however. +/- 5600 ppm is quite large! Many will tune a smaller range like +/- 100 ppm. You many need to look into an external VCO which would not have as good jitter cleaning, and you may be better of with a single loop clock generator. Then you don't have to have an external VCXO + clocking chip.