What is the signal type of ADF4351 REFin, sine wave or square wave? And what is the power level scope (dBm) of the REFin?
Thanks very much!
REFIN can be a square wave, a pure sine wave or a clipped sine wave, but must meet the datasheet requirements in terms of REFIN Sensitivity, REFIN Frequency/Slew rate and nominal threshold of VDD/2.
The signal level for REFIN is specified to have a voltage greater than 0.7Vpp, and less than VDD, biased at VDD/2. AC coupling ensures Vdd/2 as the REFIN input circuitry is biased at Vdd/2.
But the difference is probably pretty small.
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