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AD9833: What makes the output sine and triangle wave look like stairs?

Question asked by Rodo on Dec 11, 2013
Latest reply on Dec 14, 2013 by KA0THK

Hi all,

 

I'm working with a AD9833. I have a 1MHz oscillator for the master clock. It works fine at low frequencies (<10kHz). But when I try to go higher the output looks like a staircase (steps). This does not happens at a specific frequency though. It gets worst as I increase the frequency. The triangular wave does the same thing. The master clock frequency looks like a perfect square wave. The design is in a PCB with connection to a breadboard. No ground planes at all in the PCB. Is this a noise issue? or Am I missing something more fundamental?

 

Thanks

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