What
Are you measuring the jitter on one of our reference boards?
Jitter is has several possible sources.
a) PVDD power and PLL filter has to be very clean
b) noise injected by other circuits
1) The evaluation board meets HDMI compliance of which jitter is one of the tests.
2) The AD9889B is an old and jitter was spec'd per HDMI 1.2 in nanoseconds. The ADV7513 is newer and was spec'd per HDMI1.4 in UIs which is resolution independent.
3) The gear hopping just refers to better PLL response as formats are changed