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AD9956 no output

Question asked by antidigital on Jan 13, 2013
Latest reply on Jan 14, 2013 by Kevin.G

I am using AD9956 in a simplest way to generate a single frequency. The schematic is show as below.

DDS1.png

DDS2.png

 

I configure it with a CPLD. All the inputs are checked through OSC and are OK.

But there are no wave output on pin SYNC_OUT, and the voltage level on Pin5 and Pin6 remain 1.8V.

 

Could anyone figure out where it may be wrong?

 

PS: the configuration follows the sample code provided by ADI as attached

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