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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'd suggest for you to get an EVB to try this on. The customer may benefit from one long-term as well, to compare against their own board.

    We had never noticed any INL/DNL issues of this kind during development, not on the EVB either. The issue is likely on the customer board, with the layout, power supply section, or the vector. 

    Have you tried switching between 2's comp and unsigned vectors?

    Do you generate the vectors using DPG Downloader?

    Best Regards,

    Arik

Reply
  • Hi mochi,

    I'd suggest for you to get an EVB to try this on. The customer may benefit from one long-term as well, to compare against their own board.

    We had never noticed any INL/DNL issues of this kind during development, not on the EVB either. The issue is likely on the customer board, with the layout, power supply section, or the vector. 

    Have you tried switching between 2's comp and unsigned vectors?

    Do you generate the vectors using DPG Downloader?

    Best Regards,

    Arik

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