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CDCE913 interesting use

Other Parts Discussed in Thread: CDCE913

Hi,

I am using CDCE913 to generate three output clocks, Y1 Y2 Y3. Because of design constraints the, i cannot use any of the clock signals as an interrupt to synchronize my design, hence using internal DSP(C674x) timer. My question is can we setup the outputs Y1 2 Y3 in tri-state mode and provide the clock into the CDCE, and provide enough time for the clock signals to stabilize(internally), and then if i enable these three outputs what is the possible jitter or stabilization time? not much clear in the data sheet.

  • Hello Imran,

    it is possible to set the outputs to tri state to wait until the internal PLL is locked to the right frequency.

    Startup time:

    After power up, a xtal input need typ 250us to stabilize. Additionally the PLL need up to 27us to lock to the right VCO frequency. After this time, the outputs can be enabled.

    Jitter:

    cycle to cycle jitter and period Jitter are specified in the datasheet.

    Best regards,

    Julian