SNAS736C June 2017 – April 2019 LMX2595
The SYNC input pin can be driven either in CMOS or LVDS mode. However, if not using SYNC mode (VCO_PHASE_SYNC = 0), then the INPIN_IGNORE bit must be set to one, otherwise it causes issues with lock detect. If the pin is desired for to be used and VCO_PHASE_SYNC = 1, then set INPIN_IGNORE = 0. LVDS or CMOS mode may be used. LVDS works to 250 mVPP, but is not ensured in production.