Whats the best way to implement a lock detect function using the ADF4159 with a 100MHz PFD frequency? Can the 'digital lock detect' function be used without modification, or are there issues with minimum window size?
Hi John. The ADF4159 is not released yet and this functionality hasn't been fulled characterized. Digital Lock Detect should function as expected.
You can find more information on lock detect of our PLLs here: http://www.analog.com/static/imported-files/application_notes/AN-873.pdf
Thanks for replying
AN873 seems to suggest that at frequencies above 15MHz that the Digital lock
detect is not reliable and suggests to use the analogue lock detect. However
the analogue detect function is not available on the ADF4159. What do you
My mistake - AN-873 only applies to our Integer-N PLLs.
Our Fractional-N PLLs have a different implementation of digital lock detect which will work at all PFD frequencies on the ADF4159.
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