It isn't stated in the HMC900LP5E datasheet what type of waveform the CALCK pin (calibration clock) accepts, does it have to be a sine wave or would LVPECL be ok? Also what are the minimum/maximum power levels this pin accepts?
It needs to be a square-wave with a frequency between 20 & 40 MHz. Vil < 0.4 V and Vih > 1.5V.
Absolute maximum ratings are listed in Table 3 in the datasheet.
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