Why do the SYSREFs to the AD9081s from the HMC7043 use LVPECL termination instead of LVDS termination?
added additional tags
[edited by: stetz at 3:12 PM (GMT -4) on 23 Apr 2021]
There is a well known bug on the HMC7043/HMC7044 on the SCLKOUT lines where the LVDS output does not properly idle at the LVDS logic levels. The work around is to use LVPECL output on the SCLKOUT lines and use a conversion network to LVDS as shown here: https://wiki.analog.com/resources/eval/user-guides/quadmxfe/boardhardwaredetails#lvpecl_to_lvds_one-shotn-shot_sysref_vs_continuous_sysref