HMC394LP4, CML Interfacing to Inputs

What is the common mode voltage of the inputs on pins 13 and 14. Do I have to terminate the CML inputs to Vcc and AC couple? Then do I have to provide a bias to the inputs? Also, in the pin description for pin 13, it says "RF input 180° out of phase with pin 14 must be AC ground." What does that mean?? You have to AC ground an input? Is it impossible to put in a differential signal? It sounds like it was written by a person which does not understand English very well.

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