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AD9834 digitally distorited output Sine Wave

Question asked by Jdo300 on Aug 14, 2010
Latest reply on Aug 24, 2010 by AndyR

Hello All,

 

I have designed a built a dual-channel DDS function generator board using two AD9834 ICs to produce the channel output waveforms. So far my REV A board has been functional in terms of communicating with the DDS ICs and modifying the frequency, phase, and toggling between sine/triangle output.

 

My problem is that when the IC is outputing the sine wave or triangle wave, it looks extremely distorted as if the internal SIN ROM was misprogrammed. I attached a scope shot showing the output waveform for reference along with the portion of my schematic showing the DDS and output filter). Has anyone ever seen this anomaly before?

 

Thank you,

 

Jason Owens

Research & Development

Resonance Group, ltd.

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