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how to make a AD9833 be synchronous with another signal source

Question asked by Bruce.Fan on Dec 29, 2010
Latest reply on Jan 4, 2011 by Bruce.Fan

Hi, all

Anybody can help to answer this question?

In my system, I need use AD9833 to be synchronous with another signal source, or with a constant phase(same frequency).

In the specification, AD9833 use the soft code to reset the DAC out. But how to control the command tranfer time accurately?

Can I control the DAC output in the following way?

 

step1: stop the MCLK;

step2:set the RESET bit=1 via SPI;

step3: Configure all other registers with SPI interface.

step4: set the RESET bit =0 via SPI;

step5: enable the MCLK to operate the AD9833;

 

 

question1: is it the right way to start the AD9833 accurately?

question2: after step5, is there still 8/9 MCLK cycles delay to see the DAC's change?

 

thanks a lot

Merry Christmas and Happly New Year!

Bruce

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