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Offset and Gain Temperature Coefficients When Using an External Reference

		
	
				

			

									
					    LTC2672
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 5, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about the offset and gain temperature coefficients of the LTC2672-16 when using an external voltage reference with zero drift. The support engineer noted that exact quantification is difficult but suggested that the TUE specifications provide a worst-case estimate. The user clarified that the internal reference's drift is too high for their application and requested typical numbers or rough estimates for drift performance with an external reference.
                        	    
    
                
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    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  LTC2672 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Folks,
    

    I'm interested in using the LTC2672-16 part in a design.  For this part, both the offset and gain temperature coefficients are specified on page 4 of the datasheet.  My question is this:  If I were to use an external voltage reference, and assuming that this reference had zero drift / temperature coefficient, what would the LTC2672-16's performance be for offset and gain temperature coefficients?  Said another way, how much of the offset & gain temperature coefficient specifications are due to the internal voltage reference, and how much are due to the LTC2672 itself, i.e., without the voltage reference?  Please let me know.
    

    Thanks,
    

    - Mike A.
    
			
    
			
									
		                             
                        

    
    
                                            
                 Datasheet/Specs
                
                                                    
                 ltc2672
                
                                                    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Aug 6, 2025 4:46 AM
            
            
						
			            		
      
		
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      Hi  ,

      It would be hard to exactly quantify the performance improvement when using a theoretical reference with zero drift / temperature coefficient with the information we have.
      However, for this specific product, the TUE is provided for various output current ranges and packages so we can anticipate the worst case or biggest swing possible for this device.
      Hope this helps.

      Regards,
      Flynn
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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                on Aug 6, 2025 11:54 AM
            
            
												
						in reply to FlynnEdmund
					
										
			            		
        
		
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        Flynn,
        

        Thank you for the response.  For our application, we're planning on using an external voltage reference, since the PPM / degree C drift of the internal voltage reference is too high.  Therefore, the information in the TUE specifications is most likely too conservative for our application, since they presumably include the drift of the LTC2672's internal voltage reference in their min/max specification numbers.  Also, we can probably calibrate out any static / DC output current errors, so the drift perforrnance is what's most critical for us.  I don't know if the employees of ADI on this platform have access to the engineer(s) who designed this component or perhaps the appropriate applications engineers, but I'm guessing that these folks would be able to answer my questions.  Also, FYI I'm not looking for any guarantees here, so just typical numbers or  rough estimates would be helpful.
        

        Best regards,
        

        - Mike A.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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