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ADF4153A Refin type

Possibly a basic questions but I'm trying to determine the type of clock I can use for the Refin on an ADF4153A.  The data sheets states that it is a CMOS input or AC coupled with threshold of VDD/2.  if my VDD is 3V can I run this with an AC-coupled sine wave at 10 MHz where the p2p voltage is say 2V (just over the 1.5 but less than Vdd)?  The max-spec of REFin to GND of -0.3V makes me think not as the Voltage would go to -1V?

Any help much appreciated.