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AD9776 Production
The AD9776 / AD9778 / AD9779 are dual, 12-/14-/16-bit, high dynamic range, digital-to-analog converters (DACs) that provide a sample rate of 1 GSPS, permitting...
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AD9776 on Analog.com

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Measure SNR of DAC



		

			

									
					    Karami
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 26, 2012 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    we usually measure output spectrum of DAC AD9776 with spectrum analyzer.
    
 
    It seems that SNR is too low for a this DAC (about 10dB !). But I don't know what's wrong ?
    
 
    thanks
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 D/A Converters (DAC)
                
                                                    
                 ad9776
                
                                                    
                 High Speed D/A Converters =30MSPS
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 26, 2012 5:31 PM
            
            
					
      
	
      

		
		
      
					
      Can you explain what mode you are using the AD9776 ( interpolation and filter modes used) and give some details on data sample rate, output frequency of itnerest what results are you seeing and under what operating conditions. 
      
 
      We spec SFDR and NSD but not SNR so maybe there is some confusion in how   SNR relates to  the SFDR and NSD specs we include. If you are seeing too high of noise you could do better with the AD9778 or AD9779. If you are seeing too high of distortion then you may be limited by the analyzer or our specs may not be clear on our data sheet.
      
 
      Can you send us a scren shot of the spectrum analyzer to look at?
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 26, 2012 5:31 PM
            
            
					
      
	
      

		
		
      
					
      Can you explain what mode you are using the AD9776 ( interpolation and filter modes used) and give some details on data sample rate, output frequency of itnerest what results are you seeing and under what operating conditions. 
      
 
      We spec SFDR and NSD but not SNR so maybe there is some confusion in how   SNR relates to  the SFDR and NSD specs we include. If you are seeing too high of noise you could do better with the AD9778 or AD9779. If you are seeing too high of distortion then you may be limited by the analyzer or our specs may not be clear on our data sheet.
      
 
      Can you send us a scren shot of the spectrum analyzer to look at?
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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