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in the ADF4159+ADF5901,who decide the VCO’s frequency ?

Question asked by xhl on May 31, 2017
Latest reply on May 31, 2017 by xhl

We use ADF4159 and ADF5901 to produce RF signal.In ADF4159 datasheet,we can set register to set vco’s frequency,and In ADF5901 datasheet,we can set register to set vco’s frequency.the question is:if in the ADF4159+ADF5901,we set different VCO’s frequency, who decide the VCO’s frequency ? in the ADF4159+ADF5901application,we comprehend the workflow of the ADF4159 and ADF5901 :first set vco’s frequecny of the ADF5901,for example,24GHZ,secondly,we repeatly set different VCO’s frequency of ADF4159,the ADF5901 can output signal at corresponding frequency.please check my comprehension is right or not?