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

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  • Hi Mochi,

    I think I caught a few questions here, let me try to clarify:

    vector is simply a "vector of samples", so effectively the .txt that holds the samples you feed into the DAC. These are the samples that define your sawtooth signal.

    time domain, as opposed to frequency domain, is just another way to view the signal. So the plot you showed is a time domain plot. If you played this sawtooth into a spectrum analyzer, or did an FFT on the time domain samples, you would get the frequency domain representation of that signal.

    per your comments, it sounds like the glitch is due to the sample transitions, so NOT the midscale of the DAC full-scale range, but rather related to bit transitions in the DAC core itself.

    Let me think about this a bit more..

    Best Regards,

    Arik

Reply
  • Hi Mochi,

    I think I caught a few questions here, let me try to clarify:

    vector is simply a "vector of samples", so effectively the .txt that holds the samples you feed into the DAC. These are the samples that define your sawtooth signal.

    time domain, as opposed to frequency domain, is just another way to view the signal. So the plot you showed is a time domain plot. If you played this sawtooth into a spectrum analyzer, or did an FFT on the time domain samples, you would get the frequency domain representation of that signal.

    per your comments, it sounds like the glitch is due to the sample transitions, so NOT the midscale of the DAC full-scale range, but rather related to bit transitions in the DAC core itself.

    Let me think about this a bit more..

    Best Regards,

    Arik

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