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urgent question about CDCE62005

Nick Carter
Intellectual 830 points
Other Parts Discussed in Thread: CDCE62005

Hi,

I'm using CDCE62005 in my design to provide clock to some main chips on the board. I wanna use the AUXIN pin with a 25MHz crystal connected and left the SECREF, PRIREF pin unconnected. The output frequency I want is 50MHz,100MHz and 250MHz.

But I've looked through the datasheet of CDCE62005 and I am confused. The internal blocks of CDCE62005 are all dividers. Can I get the frequencies above by setting these dividers? Or are there some multiple frequency block in the CDCE62005?

Last but not the least, what's the relationship between internal VCO and the  25MHz crystal which connected to the AUXIN pin? And what's the function of internal VCO?

Thank you all

Nick

  • 0
    TI__Expert 3985 points

    Hi Nick,

    yes, you can get the 50MHz, 100MHz and 250MHz by using the AUX pin with a 25MHz crystal with the CDCE62005. On the following link in the Tools & Software section you can find a GUI interface for this device:

    http://www.ti.com/product/cdce62005

    A nice feature of this GUI is the Frequency Planner. You can select your input frequency and the output frequencies that you would like to have. The GUI will generate the divider setting according to your request. The dividers are used to divide down the VCO frequency in order to get a frequency values which is equal to the input (AUX or PRIREF or SECREF) frequency.

    For further info please do not hesitate to contact us.

    Best regards,

    Leandro