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AD9951 Recommended for New Designs
The AD9951 is a direct digital synthesizer (DDS) featuring a 14-bit DAC operating up to 400 MSPS. The AD9951 uses advanced DDS technology, coupled with...
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AD9951 on Analog.com

AD9551 Last Time Buy
The AD9551 accepts one or two reference input signals to synthe-size one or two output signals. The AD9551 uses a fractional-N PLL that precisely translates...
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AD9551 on Analog.com

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About the output of AD9951

		
	
				

			

									
					    Struggle_HL
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 23, 2018 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user encountered an issue with the AD9551 output filter where signals below 30 kHz were heavily attenuated due to the ADTT1-1+ balun's frequency response. The solution was to replace the ADTT1-1+ with the ADTT1-6+ balun, which operates better at lower frequencies. An alternative suggestion was to omit the transformer and couple directly to one side of the DAC, but this results in half the output voltage and a DC return to 1.8V.
                        	    
    
                
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    Dear Forum
    

       I refer the official manual to design AD9551 ,and my output filter is refer AN-837 as follow，
    

    

     
    

     now my problem is when my output frequency is 100KHZ,it output normally,but when my output frequency below 30KHZ,it  hadn't output,the signal
    

    at primary is 1.75V(DC),and the signal at secondary is zero,my balun is ADTT1-1+，I want to know why?
    
			
    
			
									
		                             
                        

    
    
                                            
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