ADCLK854 lacking output

Hi, eveyone.

I'm evaluating ADCLK854 evaluation board.
I found a lacking output. I don't know it was caused by measurement issue or others.

Hear is the detail.

We input "burst clock" to this device.
It can be seem at "first burst clock" after power-up.
We didn't see it after the second burst clock.
It looks like it doesn't depend on the time from power-up.

and it doesn't depend on clock freq, I think.

I saw 2M- 200MHz.

I would like to have your advice.
  • 0
    •  Analog Employees 
    on May 27, 2011 6:53 PM

    Hi Moto,

    Correct if I'm wrong, but the vertical scale on the input signal (yellow) in the plot displays 1V/div. However in the plot, it appears the input signal swing is way less than one vertical division. There's reference to 880mV per the description beside the yellow marker at the bottom center of the plot. So, what is the input swing to the ADCLK854? If it's 880mV pk pk, I'm not sure what the issue?  Note, the ADCLK854 evaluation board ac couples the inputs and outputs, but your picture shows dc coupling. Is this correct?

  • Hi DSB

    Thank you for your reply.

    880mV is trigger level of oscilloscope. The input signal is 1V/div.

    I've removed the capacitors at input and output of the evaluation board.

    I'd like to check AC couple, but is the DC couple circuit unacceptable ?

  • Sorry for slow reply.

    I changed input level and check again.(please look attached figure.)

    The input was over 0.9V but output has lacked.

    I saw same behavior of other device.

    This lacking was increased when the device temperature was up.

    Could I have a comment?

    Is it a measurement problem or?


    I tried to use coupled capacitors, and check it, but it was difficult because of input noise.

    But,"burst signal" usually connect directly, I think...

    Could I have a comment?

  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:23 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin