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AD9517-3 usage on 4DSP FMC110

Question asked by pberger on Jun 19, 2017
Latest reply on Jun 22, 2017 by neilw

Hello - has anybody used this setup and can help with configuration?  I am trying to configure the AD9517-3 such that the LVPECL outputs are at 250MHz.   The input ref on the FMC110 per their spec is 100MHz.  I am unable to get the PLL to lock.     I am setting the following AD9517-3 registers:


0x1C:    0x2    - use REF1 (100MHz)

0x11:     0xA    - R divider 10  - get ref to 1000MHz

0x190:   0x33  -  Divider 0  (3+1) cycles high, (3+1) cycles low  to divide by 4 to get 250MHz

0x10:     0x7E - PLL Normal Operation

0x18:     0x0

0x232:   1

0x18:      0x1

0x232:   1 

Read 0x1F - always get 0xE  - PLL not locked


What am I doing wrong?

Thanks very much!