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LMK5B12204: Can't seem to get outputs to mute before lock

George Joseph
Prodigy 130 points
Part Number: LMK5B12204


Tool/software:

I can't seem to find a combination of register settings that will keep the outputs muted until APLL/DPLL lock to PRIREF.  Either the outputs are muted all the time or they're never muted.

I'm using the TICSPro Advanced page to try and set the flags but there's some ambiguity in the register descriptions.  For instance, MUTE_DPLL_PHLOCK says "DPLL mute enabled during phase lock" but does that really mean "mute while the DPLL is locked" (which doesn't make any sense to me) or "mute while the DPLL is trying to acquire a lock"?

Anyway, I've attached my tcs file which is pretty basic...  1MHz in to PRIREF, 12.8MHz TXCO in to XO and 10MHz out to OUT3 in CMIS(+/-) mode.  A lock to PRIREF takes about 3-5 seconds and I'm trying to mute the output until that lock.  All the sync options are unchecked because it's the only config I can get to work.

Some guidance would be appreciated.

Thanks!

lmk5b-new-1mhz.tcs

  • +1
    TI__Genius 13200 points

    Hi George, 

    MUTE_DPLL_PHLOCK will mute the output while the DPLL is acquiring phase lock, and once LOPL_DPLL is cleared then the output will automatically be unmuted. MUTE_DPLL_FRLOCK works similarly but with respect to the LOFL_DPLL status. 

    To mute the outputs until the DPLL locks, on the "outputs" page check the MUTE_DPLL_PHLOCK and MUTE_DPLL_FRLOCK boxes towards the top of the page, and by OUT3 check the MUTE box and select the last option on the MUTE_LEVEL drop down box (I think there's a typo in the text here, the last option should just read 'Force output low'). I verified that with these changes your config works as intended. Let me know if this works on your end. 

    Regards, 

    Connor 

  • +1 in reply to Connor Lewis
    TI__Genius 16875 points

    Hi George,

    Please also install the latest TICS Pro as there was a recent update to the profile.

    www.ti.com/.../TICSPRO-SW

    Regards,

    Jennifer

  • 0 in reply to Connor Lewis
    Prodigy 130 points

    Ah ha!  Setting MUTE and "Mute Level" on OUT3 works.  That's what I was missing.  The option description just says "Mute Control" which implies it forces the output to a specific state.  Nothing indicates that it's only applied if one of the other MUTE options is selected.

    Thanks Connor!

  • 0 in reply to Jennifer Bernal
    Prodigy 130 points

    Thanks Jennifer.  I already updated to 1.7.9.0 last week.