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Signal Frequency Conversion Application

Giulia Folpini
Prodigy 20 points

Other Parts Discussed in Thread: CDCE913, LMK04906, LMK03200

We wish to convert an 85 MHz signal to a ~72 MHz signal. It is necessary that the phase of the output is stabilized relative to the input signal. An output signal in the range of 70-74 MHz is acceptable for us. 

We are considering purchasing and using a Texas Instruments CDCE913 Evaluation Module for this purpose. 

Is this device suitable for our application? Are there other devices better suited to this application? 

  • 0
    TI__Mastermind 24205 points

    Hi Folpini,

    Could you please elaborate on "phase of the output is stabilized relative to the input signal"?

    CDCE913 can take a 85 MHz LVCMOS input and generate a 72 MHz Output

    Regards

    Arvind Sridhar

  • 0 in reply to Arvind Sridhar
    Prodigy 20 points

    Thank you for your wuick answer.

    I'll try to clarify: the frequency conversion that we need corresponds to having six maxima in the output signal for every five maxima in the input. We would like to know if those maxima (every fifth for the input and sixth for the output) are locked, or what would be the time jitter  between them.

  • 0 in reply to Giulia Folpini
    TI__Mastermind 24205 points

    Hi Folpini,

    Yes. They will be locked but the phase relationship will change upon power cycling. If you want to line up every 6th edge of the input with the 5th edge of the output and want the relationship to be deterministic every time, you would need to use a zero delay multiplier such as LMK03200. However this device will only support differential outputs (LVDS/LVPECL). Another option is to use LMK04906 in 0-delay single loop mode.

    Regards

    Arvind Sridhar