Muliple AD9219 synchronization

Hello all,

In a project I have to digitize up to 6 CVBS PAL coded independant video signals.

The AD9219 chip seems to do the job with a fairly low power consumption (which is important in this case).

Nevertheless it only includes 4 ADCs.

If I use two of those chips, is it possible to synchronize them, if so, how ?

Thanks in advance for your help.