I'm driving sysref to AD9695 from HMC7044.
Since I use 1shot sysref it must be DC coupled. HMC can't work in LVDS mode for DC coupled 1shot sysref (known issue) thus forces me to work in LVPECL.
from HMC (driver) point of view, recommended termination is:
with DC parameters:
On the other hand, AD9695 requirements are:
So it seems that Vcm is at the edge of the upper value , and also swing.
How do you reccomend to connect?