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ADUC7061 Production
The ADuC7060/ADuC7061 are fully integrated, 8 kSPS, 24-bit data acquisition systems incorporating high performance multi-channel sigma-delta (Σ-Δ) analog...
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ADUC7061 on Analog.com

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Function of gain and offset calibration registers

		
	
				

			

									
					    eah0313
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Dec 3, 2025 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquired about the internal application of offset and gain calibration registers on ADC results. The final answer confirmed that the 16-bit offset register is subtracted from the 24-bit ADC results, and the 16-bit gain calibration register scales the results to correct full-scale errors. The user expressed concerns about potential resolution issues given the non-zero and non-full-scale calibration values.
                        	    

                
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The data sheet says nothing about how these registers affect conversions.  Is the value in the offset register subtracted from ADC results internally?  If so, what is the scaling?  Results are 24 bits, but the gain and offset registers are 16 bits.  Is the gain calibration register used to internally modify the ADC conversions?  If so, how?  Is there a document that describes the process?

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Dec 4, 2025 9:49 PM
            
            
						
			            		
    
		
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    Hi,
    

    The offset register is applied internally to the ADC results.
    

    Similarly, the gain calibration register is applied internally scale the ADC results and minimize full scale errors.
    

    Typically, the gain and offset errors are minimal, so a 16-bit register should suffice in correcting these errors.
    

    Thanks,
    

    Karl
    

    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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                on Dec 5, 2025 11:43 AM
            
            
												
						in reply to Karl.O
					
										
			            		
    
		
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    Thanks for your reply, Karl.
    

    I'm essentially reverse engineering a design of a colleague who has moved on.  The issue is that the zero- and full-scale calibrations are being used to apply a gain and offset to a measurement.  The zero value is not close to zero -- it's more like 10% of the reference voltage (~0.25V), and the full scale value is about 25% of the reference. My gut says this should cause scale and offset errors due to the resolution of the constants.
    

    Ted
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Dec 5, 2025 11:43 AM
            
            
												
						in reply to Karl.O
					
										
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Thanks for your reply, Karl.
    

    I'm essentially reverse engineering a design of a colleague who has moved on.  The issue is that the zero- and full-scale calibrations are being used to apply a gain and offset to a measurement.  The zero value is not close to zero -- it's more like 10% of the reference voltage (~0.25V), and the full scale value is about 25% of the reference. My gut says this should cause scale and offset errors due to the resolution of the constants.
    

    Ted
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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