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ADUM4195 Recommended for New Designs
The ADuM3195/ADuM41951 are isolation amplifiers based on Analog Devices, Inc., iCoupler® technology. The ADuM3195/ADuM4195 have very low offset and gain...
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ADUM4195 on Analog.com

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Can GND be used as reference voltage

		
	
				

			

									
					    Sumeet6
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 30, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  ADUM4195  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello ADI team,
    

    

    I am planning to use isolated amplifier to remove 50 Hz ground loop from my application. I have decided to use ADUM4195 amplifier. However my concern is with reference voltage. My signal is singled ended signal centered around 0V, can I give 0V as reference to ADUM4195 non inverting pin instead of reference voltage output provided by amplifier. I will be using it also for calibration purpose of my sensor, my requirement is that signal should be centered around the 0V for proper calibration. Having DC offset of 1.25 or 2.5V is extremely undesirable.
    

    Second question, will the use of isolation amplifier eliminate the 50 Hz ground loop I am observing?
    

    

    Please answer my question at earliest, as this design is time sensitive project.
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 10, 2025 4:41 AM
            
            
						
			            		
      
		
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      Hi  
      

      Thanks for the question.
      

      The connection to VREF (marked with a red dot in the image below) is intended to provide a positive DC bias to the input signal. This ensures that the signal remains within the amplifier’s valid input voltage range, which is between 0.25 V and VDD2 – 0.7 V.
      

      

       
      

      If the input signal is centered around 0 V, it would include negative voltage components that fall outside the amplifier’s operating range. As a result, the output (VOUT) would be distorted or clipped during those portions of the waveform, effectively making the amplifier "blind" to the negative part of the signal.
      

      For what concern the calibration on your application, is your sensor calibrated with the input voltage or with the output voltage?
      

      Regards,
      Alessandro
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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