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ADF4158 MUXOUT

sss@jpn
on Jun 24, 2020

Hi all,

It seems that two types of DIVIDER output can be selected for the MUXOUT of the ADF4158.

R or N-DIVIDER OUTPUT, R or N DIVIDER/2
R-DIVIDER OUTPUT
N-DIVIDER OUTPUT
R-DIVIDER/2
N-DIVIDER/2

question 1
Is the understanding of the following signals correct?
Is duty cycle double ? or half ?
(R-DIVIDER OUTPUT)/2 = R-DIVIDER/2 ?
(N-DIVIDER OUTPUT)/2 = N-DIVIDER/2 ?

Question 2
R-DIVIDER OUTPUT and N-DIVIDER OUTPUT can be confirmed with other PLL products, but I have never seen R-DIVIDER/2 or N-DIVIDER/2. ‥
What is it used for?

Best regards,
sss

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  • +1
    •  Analog Employees 
    on Jul 14, 2020 10:20 AM

    Hi, a few other devices have N/2 or R/2 available at muxout. ADF41513 is another example I can think of the top of my head. Another example is the ADF4007 only has the option for R divider / 2 to muxout. 

    As an example, if the RFIN frequency = 6GHz, PFD = 100MHz, N = 60 then N counter will output 100MHz at muxout. This would then be 50MHz when N counter / 2 to muxout is selected.

    Regards,

    Alex

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  • +1
    •  Analog Employees 
    on Jul 14, 2020 10:20 AM

    Hi, a few other devices have N/2 or R/2 available at muxout. ADF41513 is another example I can think of the top of my head. Another example is the ADF4007 only has the option for R divider / 2 to muxout. 

    As an example, if the RFIN frequency = 6GHz, PFD = 100MHz, N = 60 then N counter will output 100MHz at muxout. This would then be 50MHz when N counter / 2 to muxout is selected.

    Regards,

    Alex

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