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How would you recommend generating PWM

Question asked by ARQuattr on Oct 25, 2010
Latest reply on Mar 29, 2011 by eephillip

Hi,

     I'm new to using DDS devices, and I'm considering using the AD9833 to produce a PWM signal.  I need a square wave output with frequency up to 500 kHz and 0.1Hz resolution, but with duty cycle between 10% and 90%.  Firstly, are there any DDS that don't include the ROM and DAC since I don't need that?  But more importantly, can anyone suggest how I would go about producing the variable duty cycle?  Are there DDS devices that allow that adjustment, or can you suggest an external component that would accomplish it?  I imagine a PLL would be needed but I haven't seen any yet with adustable duty cycle.

 

Thanks,

Angelo

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