Output sawtooth wave to AD9144

This is a question about the operation of the AD9144.
My customers are evaluating the AD9144.
My customer is trying to output sawtooth waves from AD9144.
T = 200 nS, + 100 count → -100 count
The customer inputs the code and evaluates the output waveform.
Strangely, the output slope bounces small around 0 count.
Customers suspect this as miscounts.
Is this due to the nature of T-DAC?
Do you have any views?
Please advise me.

 

Is this phenomenon called MIDSCALE GLITCH?
Where should I check to isolate it from mistakes in circuit design?

Best regards

Parents
  • I am grateful for your attention to my post.
    I feel encouraged by the help of experts.

    The following is a fragment of the plot.


    This is a new plot obtained after posting.
    The height of the saw blade is +50 count at the peak and -50 count at the valley.
    I expect you to find something in the middle of the slope connecting the peaks and valleys.
    The slope is formed by changing the count along time.
    I guess this is the same as your "time domain".
    According to customer's explanation, something happens where the data switches from all zero to all FF.
    I have never touched the DPG Downloader, but I guess that this plot is not from the DPG Downloader.

    After posting, I guessed that the something was noise from other places that occur along time.
    The case assumed by me is that one of the measuring instruments generates noise along the measurement cycle.
    I requested the customer to try some waveforms.
    The result denied my hypothesis.
    Something occurred along the count and did not occur along the cycle.

    I requested a customer a + 100 to 0 sawtooth.
    Something appeared in the bottom of the saw (0: all zero to all FF points).

    I requested the customer a sawtooth wave from 0 to -100.
    Something did not show up.

    I am sorry, I regret that I do not understand your "vector".
    I hope the information is not insufficient.

    Best regards

Reply
  • I am grateful for your attention to my post.
    I feel encouraged by the help of experts.

    The following is a fragment of the plot.


    This is a new plot obtained after posting.
    The height of the saw blade is +50 count at the peak and -50 count at the valley.
    I expect you to find something in the middle of the slope connecting the peaks and valleys.
    The slope is formed by changing the count along time.
    I guess this is the same as your "time domain".
    According to customer's explanation, something happens where the data switches from all zero to all FF.
    I have never touched the DPG Downloader, but I guess that this plot is not from the DPG Downloader.

    After posting, I guessed that the something was noise from other places that occur along time.
    The case assumed by me is that one of the measuring instruments generates noise along the measurement cycle.
    I requested the customer to try some waveforms.
    The result denied my hypothesis.
    Something occurred along the count and did not occur along the cycle.

    I requested a customer a + 100 to 0 sawtooth.
    Something appeared in the bottom of the saw (0: all zero to all FF points).

    I requested the customer a sawtooth wave from 0 to -100.
    Something did not show up.

    I am sorry, I regret that I do not understand your "vector".
    I hope the information is not insufficient.

    Best regards

Children
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