On page 4-2 of the attached HMC394 data sheet, v09.0114, AD provides a plot : "OUTPUT POWER, 5 MAJOR DIVIDE RATIO STATES, T=25°C"
the output power is given in dBm from N=2 to N=32.
In my setup, I will inject a SQUARE wave of Fin=3.1805 MHz and 9 dBm max, with N=32 (Ai=1) to obtain Fout=99.392kHz.
Q1 : what is the input power used for this plot ? is it 10 dBm ?
Although we cannot change it, could you please explain in simple words why the output power is decreasing as a function of N ?
Q2 : Do you confirm that the HMC394 is able to handle the low frequency of 3.1805 MHz ?
If well understood, the answer should be "yes", according to the note (1) page 4-1 : "Divider will operate down to DC for square-wave input signal".
Am I correct ?
But, according to the plot "Input Sensitivity Ratio States", page 4-2, there is a "RECOMMENDED OPERATING WINDOW", starting at 250MHz.
Or, is this plot for sinewave only ?
Q3 : In my setup, I can feed the HMC394 with a LVDS signal, but the EVAL board only comes with a single ended input : do you know WHY AD made this choice ?
What is strange is that there is no possibility to select the input mode, LVDS or Single Ended, offered on the EVAL board.
If I would like to design a new PCB myself, do you confirm I can work in LVDS mode ?
Q4 : What should I do with the /OUT signal if I only need the OUT signal ? Should I load it with a 50 Ohms ?