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AD4134 Recommended for New Designs
The AD4134 is a quad channel, low noise, simultaneous sampling, precision analog-to-digital converter (ADC) that delivers on functionality, performance...
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AD4134 on Analog.com

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Reference Gain Correction for the AD4134

		
	
				

			

									
					    miky
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 10, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about the calculation formula and accuracy of reference gain correction using the REFIN_GAIN_CORR_EN bit on the AD4134. The correction is achieved by multiplying the ADC output code by a stored constant, which is the ratio of the expected digital output (based on the measured voltage on the REFIN pin) to the actual ADC output. This compensates for the voltage drop across the 20 ohm internal resistor. No specific accuracy information was provided.
                        	    
    
                
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    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  AD4134  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello.
    

    I have a question regarding reference gain correction using the REFIN_GAIN_CORR_EN bit on the AD4134.
    

    Is there a calculation formula for the reference gain correction?
    

    Also, is there any information available regarding the accuracy of the correction?
    

    Best regards.
    
			
    
			
									
		                             
                        

    
    
                                            
                 Datasheet/Specs
                
                                                    
                 AD4134
                
                                                    
                 Simultaneous Sampling A/D Converters
                
                                                    
                 Precision A/D Converters
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 11, 2025 10:16 PM
            
            
						
			            		
      
		
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      Hi  ,
      

      Apologies for the delayed response. The correction is done by multiplying the output code by the stored constant computed below. This is computed using known input conditions and stored to the device.
      

      Expected/Actual
      

      Expected - digital output computed where the reference is the measured voltage on REFIN pin.
      

      Actual - ADC output
      

      This compensates for the voltage drop on the 20 ohm resistor.
      

      

      Thanks,
      Janine
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 11, 2025 10:16 PM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi  ,
      

      Apologies for the delayed response. The correction is done by multiplying the output code by the stored constant computed below. This is computed using known input conditions and stored to the device.
      

      Expected/Actual
      

      Expected - digital output computed where the reference is the measured voltage on REFIN pin.
      

      Actual - ADC output
      

      This compensates for the voltage drop on the 20 ohm resistor.
      

      

      Thanks,
      Janine
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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