You can apply differential input to HMC856 directly. The source should have 50ohms single ended impedance or 100ohms differential impedance. You need to have your impedance matched to the HMC856 input impedance 50ohms single ended or 100ohms differential.
As long as the DC termination levels and swings are compatible with CML you can apply any signal. If DC bias points do not match, please use a DC block capacitor.
As long as the DC termination levels and swings are compatible with CML you can apply any signal. If DC bias points do not match, please use a DC block capacitor.
