DDS with phase marker?

Question

Hello, 
 I am designing a Howland Current Pump, and I have previously used the AD9954 and AD9833 to generate the sine waves. I was looking to use the AD9102 as it seems easier to get hold of from suppliers, and has a broader frequency range for a single clock. 
 However, one feature I would like to add to my design is a phase marker i.e. a pulse on another pin when zero phase is reached. Is there a DDS IC that has this feature? or is there an example circuit (like a comparator after the DAC output?) 
 Thanks for any advice you can offer! 
 Jimbles

ADIApproved · Accepted Answer

Hello Jimbels, 
 You can use AD9954 for that by using both the DAC output and the comparator. Or if you prefer staying with AD9102, you can add an external comparator as you suggested. There are many high-speed comparators in the ADI portfolio https://www.analog.com/en/products/analog-functions/comparators/high-speed-comparators-lessthan-100ns-propagation-delay.html 
 Regards, 
 Will

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DDS with phase marker?

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