HMC439 use as frequency Comaprison

Question

Hi, I want to use HMC439 and Loop Filter to compare two frequencies. I do not want to use VCO. 
 The idea is to input two different frequencies to HMC439 then use a loop filter and read the output voltage of loop filter to draw the comparison between the input frequencies. 
 Can i do it using HMC439 because in doing so, i will not be using VCO and hence loop is not closed.

aandrews · Accepted Answer

Hello, 
 Yes you can try using the HMC439 like this, but it was never intended to be used in this way. It was only intended to be used in PLL applications. There may be some hysteresis when using the HMC439 like this. Using a mixer may be a better option RE: [HMC3716] 
 Regards, 
 Alex)

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HMC439 use as frequency Comaprison