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CDCVF2505 waveform of signal in

Paolo Di Lorenzo
Prodigy 20 points
Other Parts Discussed in Thread: CDCVF2505, LMK03200

Hello,
I would use the CDCVF2505 to transform a periodic signal of 1Vpp with a duty cycle of ~ 10% (1.17ns Ton, Toff 11.3ns -> 80MHz) input to have a CLKOUT Phase-Lock ~ 2-3Vpp.
Especially I must synchronize the emission of a laser (external trigger input) with this periodic signal coming from another laser (Sync Out)
It's ok this product? It works well with an input signal of this type?

The waveform of my periodic signal can be seen in the below images:



There is a development board for this product?

It would be better to use another product?

Thanks in advance.

Paolo

 

  • 0
    TI__Mastermind 24205 points

    Hi Paolo,

    The CDCVF2505 requires an input signal to satisfy VIH of 0.7 VDD (Min) and VIL of 0.3 VDD (Max) where VDD = 3.3V typical. Hence, the above signal will not work as reference to this device. I assume you still want the zero delay function? You could look at LMK03200.

    Regards

    Arvind Sridhar

  • 0 in reply to Arvind Sridhar
    Prodigy 20 points

    Thank you very much Arvind,
    Whereas the CDCVF2505 input voltage values (VIH of 0.7 VDD (Min) and VIL of 0.3 VDD (Max), VDD = 3.3V) I have amplified my low signal with a Fast OpAmp, but I have introduced a propagation delay of about 1ns. With CDCVF2505 I can compensate this delay by adding a 25pF capacitor at pin CLKOUT as I read in the datasheet?
    This capacitor must connect between the CLKOUT pin and ground? I can put a variable capacitor?
    There is an evaluation board for the CDCVF2505?

    Thanks again,
    I salute you, good job
    Paul

  • 0 in reply to Paolo Di Lorenzo
    TI__Mastermind 24205 points

    Hi Paul,

    Sorry for the late response on this one. Your understanding is correct for the case example of 100 MHz (Figure 1, Page 5 of the datasheet). Also note that the propagation delay changes with operating frequency (Figure 2, Page 5 of the datasheet).

    You need to connect the capacitor between CLKOUT and ground.

    Unfortunately, there is no EVM for this device. The only collateral I could find was this application note: http://www.ti.com/lit/an/scaa045/scaa045.pdf

    Regards

    Arvind Sridhar