Sinusoidal Phase Modulation with ADL5390


I am trying to perform up to 10MHz phase modulation on a 1.56GHz clock signal.  

I was looking at the ADL5390 and it seems like it can do this as long as the IQ signals amplitude are properly controlled, but I am not sure

1. Is the ADL5390 capable of modulation at this frequency?

2. can it accept a square wave a the input to be phase shifted? or only sine waves?

3a. what is the best way to setup continuous sinusoidal modulation using the IQ channels?

3b. what part might be good fit to control the IQ signal amplitudes in the desired fashion?