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Pro Audio PLL Master and Slave

Part Number: LMK04133
Other Parts Discussed in Thread: LMK04821

The LMK04133 seems to be a good choice  to sync to an incoming Audio -Wordclock of 32-192kHz being a Wordclock-Slave.. (fin_min = 1kHz in manual mode).

Our question would  be:

What center frequency is recommended for the external VCXO?

Many thanks!

  • Hi Frank,

    LMK04133 can be used with the incoming audio clock frequency range but it may have the minimum input frequency limitation when going to operate in auto switching mode.

    To overcome this limitation, I would be suggesting LMK04821, which has slightly lower VCO frequency range as LMK04133 but can validate with your operating VCO frequency.

    Regarding the external VCXO frequency it should be integer division of your required VCO frequency.


    Ajeet Pal