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AD9144 Recommended for New Designs
The AD9144 is a quad, 16-bit, high dynamic range digital-to-analog converter (DAC) that provides a maximum sample rate of 2.8 GSPS, permitting a multicarrier...
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AD9144 on Analog.com

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Output sawtooth wave to AD9144

		            
		

			

									
					    Mochi
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 13, 2018 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    	
			
    This is a question about the operation of the AD9144.
    My customers are evaluating the AD9144.
    My customer is trying to output sawtooth waves from AD9144.
    T = 200 nS, + 100 count → -100 count
    The customer inputs the code and evaluates the output waveform.
    Strangely, the output slope bounces small around 0 count.
    Customers suspect this as miscounts.
    Is this due to the nature of T-DAC?
    Do you have any views?
    Please advise me.
    
 
     
    
 
    Is this phenomenon called MIDSCALE GLITCH?
    Where should I check to isolate it from mistakes in circuit design?

    Best regards
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Standard High Speed D/A Converters
                
                                                    
                 High Speed D/A Converters =30MSPS
                
                                                    
                 ad9144
                
                                
            
    
    
    

		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jun 1, 2018 2:03 PM
            
                                    
					
      
	
      

		
		
      
					
      Hi Mochi, 
      
 
      I think I caught a few questions here, let me try to clarify:
      
 
      vector is simply a "vector of samples", so effectively the .txt that holds the samples you feed into the DAC. These are the samples that define your sawtooth signal.
      
 
      time domain, as opposed to frequency domain, is just another way to view the signal. So the plot you showed is a time domain plot. If you played this sawtooth into a spectrum analyzer, or did an FFT on the time domain samples, you would get the frequency domain representation of that signal.
      
 
      per your comments, it sounds like the glitch is due to the sample transitions, so NOT the midscale of the DAC full-scale range, but rather related to bit transitions in the DAC core itself.
      
 
      Let me think about this a bit more..
      
 
      Best Regards,
      
 
      Arik
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jun 1, 2018 2:03 PM
            
                                    
					
      
	
      

		
		
      
					
      Hi Mochi, 
      
 
      I think I caught a few questions here, let me try to clarify:
      
 
      vector is simply a "vector of samples", so effectively the .txt that holds the samples you feed into the DAC. These are the samples that define your sawtooth signal.
      
 
      time domain, as opposed to frequency domain, is just another way to view the signal. So the plot you showed is a time domain plot. If you played this sawtooth into a spectrum analyzer, or did an FFT on the time domain samples, you would get the frequency domain representation of that signal.
      
 
      per your comments, it sounds like the glitch is due to the sample transitions, so NOT the midscale of the DAC full-scale range, but rather related to bit transitions in the DAC core itself.
      
 
      Let me think about this a bit more..
      
 
      Best Regards,
      
 
      Arik
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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