The typical application circuit and evaluation circuit only show NREF bypassed to ground with a single-ended signal being ac-coupled into REF. Will the HMC698LP5 work with a differential input into both REF and NREF? If so, can the differential input be LVPECL or HCMOS?
I suspect that a differential square wave input is fine, but the logic levels I want to use may not be. The only datasheet spec for the REF input is an amplitude of +/-5dBm min & max at 100MHz. According to http://designtools.analog.com/dt/dbconvert/dbconvert.html a +/-5dBm square wave is about 0.25Vp-p to 0.8Vp-p. Am I right about this?