[SOLVED] AD9850 Phase with control word

[paulfjujo]

hello,


The datasheet of AD9850 show only any possible values of the control word to
change the phase shift of sinus output.
0x01 180°
0x02 90°
0x04 45°
0x14 60°
0x1A 120°

are they the only possibilities , because i don't understand the rules :
the relation ship between bits value and shift phase.

example : what is the value for 30° ?

if someone knows it , please share your information ?

 

[paulfjujo]

Solution is proposed in the post : DDS AD9850 and reset

  case 'P':  // dephasage AD9850
         {  
           Dephasage++;
           if (Dephasage >31) Dephasage=0;
           Ad9850_Control= (Byte)(Dephasage <<3) ;
           F1=(float)Dephasage * 11.25;
           fltToa (F1,txt,1);
           k=fprintf(_H_USART,"  Ad9850_Control = %02X output SINUS AD9850 %s ° \r", Ad9850_Control,txt);
           AD9850_Charge_Freq(Freq_AD9850);
           Tempo(10000L);
           Raz_Receipt();     
           break; 
         } // case P