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Ad9914 Frequency modulaiton

Question asked by zou on Nov 25, 2016
Latest reply on Mar 2, 2017 by KennyG

Dear Mr/Mrs(ADI Engineer  

      I initialized  the DDS by SPI and setted the output frequency as 400MHz, then I got the output signal of 400MHz。After this process, I setted F[3:0]=0010, and wanted to get the FM signal(FM)  through the parallel port(32 bit), so I tried to use the output as 16 bit AD  to fed through the 32 bit high 16bit directly (AD input  is the 1kHz  audio signal),but the output of AD9914  was not changed a bit, it was still  the carrier signal of 400MHz(no FM signal is generated at all). 

     Pelase le I know freely if you have any  comment.