Carrier Aggregation Problem

Dear sir:

I have encountered a Carrier Aggregation Problem of using AD9361 as followings:

I need two or more AD9361s to implement wide band multi-carrier aggregation,so I need one AD9361 operate in band 1 ,

another AD9361 operate in band 2, and let band 3 (band1+band2 continuously)  for our use.

The question is that what frequency accuracy can AD9361 RFPLL can reach,and how to sync them?

Is that possible to achieve the carrier aggregation?

Best Regards,

W.T.