Preamble: Maximum output power of AD4360 (-5dBm) is lower than recommended clock drive level for AD9958 (200..1000 mV). Moreover, I'm planning to split system by two or more boards - clock source on one board, DDS chip on another, controller on third and so on.
I dont think that differential signalling is really required here, so I need to convert differential output of PLL chip to single-ended (with help of balun), filter it, amplify it with MMIC, send via coaxial cable and re-create nice clean differential clock near DDS.
As i said, clocking frequency will be in 500MHz region.
On one hand, balun can be made as tuned LC-circuit. One other hand, it can be one magnetic transformer (TC1-1-13 looks nice), really simple and symmetrical.