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Lock window calculation for HMC840LP6CE issue

Question asked by DimaL on Sep 14, 2016
Latest reply on Sep 18, 2016 by DimaL


I experienced some problems with lock detect at -20C to -40C  for PLL HMC840LP6CE.

The lock detect window after the calculation have to be near 7ns (by old user guide)  to answer for all temperature span but PLL is not locked , even if I move the window to 7.1[nS] the pll is locked.

I found that in HMC832  hittite suggest Eq for LD window in fractional mode and it looks that this Eq working more precisely at HMC840 too, please suggest if this Eq can be used cross all the family for Hittite PLL , specially at HMC840.

I added picture with equation for HMC832.

Thank you.