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AD4111 Recommended for New Designs
The AD4111 is a low power, low noise, 24-bit, sigma-delta (Σ-Δ) analog-to-digital converter (ADC) that integrates an analog front end (AFE) for fully...
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Problem with gain in AD4111.



		

			

									
					    jaro73
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 14, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I have a problem with AD4111. After reset on VIN0-VIN1 I always read from DataRegister value with gain about 0,423, for example Vin=10V Vadc = 4,23V. The same situation is in unipolar and bipolar mode. My question is -  is it possible that this gain value is normal and I must calibrate it? This is a very large gain change to get a right value and in my opinion something is wrong. But what? 
    
									
			        
		
    

				
						
        

    
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                 AD4111
                
                                                    
                 Multiplexed A/D Converters
                
                                                    
                 Precision A/D Converters
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      Hi,
      

      Sorry for the delay. This was missed. The voltage divider on the analog front end has a division ratio of 10. Thus, the gain should be 0.1. However, when using a voltage input, the corresponding gain register must be modified by running an internal full scale calibration or by changing gain register with a nominal value of 0x55567C. May I know also how did you connected the inputs? If you could share also the schematic, that would be great.
      

      Thanks,
      

      Jellenie
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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						in reply to JellenieR
					
									
        
	
        

		
		
        
					
        Thanks for advise. All is ok now, input buffer (INBUF0 in my case)was off and after switching it on all seems to be ok.
        

        Jarek
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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						in reply to jaro73
					
									
          
	
          

		
		
          
					
          hello jaro73, how are you? I am testing the EVAL AD4111 board, connected to an ESP32, using the AD7173 library as a base, modifying the setup of the channels, which is one of the differences between both ICs, but still giving me an error when communicating with SPI, Could you help me? How did you communicate with the AD4111? Thank you
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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