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AD9106 Production
The AD9106 TxDAC® and waveform generator is a high performance, quad digital-to-analog converter (DAC) integrating on-chip pattern memory for complex waveform...
Datasheet
AD9106 on Analog.com

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AD9106 external Vref gain drift?



		

			

									
					    apreciseman
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 22, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    So I thought the AD9106 was the perfect solution to my problem but now I realized that it has a fatal flaw, the 267 PPM gain drift, specified with the rather drifty internal reference, which has a 160PPM / degree C drift.
    
 
    If a very stable external reference is used, how is gain drift re-calculated? I hope that maybe the datasheet writers tested the drift with a poor tempco Rset resistor as well.... (I could use a vishay foil here if it helps!)
    
 
    I was hoping to knock it down an order of magnitude to make it usable.. 
    
 
    Thank you. 
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 drift
                
                                                    
                 clock and timing
                
                                                    
                 temperature
                
                                                    
                 ad9106
                
                                                    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on May 21, 2014 7:38 PM
            
            
					
      
	
      

		
		
      
					
      Hi.
      
 
      I have moved this thread to the High-Speed DAC community. Someone should be able to assist you here.
      
 
      Best Regards,
      
 
      Sittie
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jun 2, 2014 7:22 PM
            
            
					
      
	
      

		
		
      
					
      Hi -
      
 
      In charaterizing the AD9106 temp drift, the on-chip reference drift and gain (IOUTFS) drift with the internal reference in use were measured fro a population of devices. To calculate the IOUTFS temp drift when using an off chip reference calculate GAIN Temp Drift - Internal Reference Voltage Temp Drif. This number is the temp drift of everything except the reference. Add the temp drift of your externalk reference to this number to get the IOUTFS temp drift with external reference.
      
 
      Thanks,
      
 
      Larry  
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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                on Jun 13, 2014 9:46 PM
            
            
					
        
	
        

		
		
        
					
        Ok. But do you know if disabling the internal Rset resistors has a significant impact on drift? I assume that the chips were tested using the on-board adjustable resistors, which may have poor tempco in comparison to external foil resistors... especially if they are used in rheostat mode like the block diagram implies, in most manufacturer data-sheets I see that rheostat mode digipots have a temp co at best of 30-100 ppm. I planned on disabling these and using a fixed very low temperature coefficent resistor. 
         
        
 
        Thank you for your time and response.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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