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AD633 Production
The AD633 is a functionally complete, four-quadrant, analog multiplier. It includes high impedance, differential X and Y inputs, and a high impedance summing...
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AD633 on Analog.com

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AD633 output offset voltage



		

			

									
					    NKokubo131
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 15, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi
    

     I am FAE in Japanese distributor.
    

    Our customer produces his product using AD633.
    

    He is calibrating AD633 at Vs+=15V, Vs-=-15V, X1=0V, X2=0V, Y1=2.5V, Y2=0V.
    

    After the calibration, he test AD633 the condition is followings.
    

    Vs+=15V, Vs-=-15V, X1=0.2Vsinusoid, X2=0V, Y1=2.5V+1Vsinusoid, Y2=0V.
    

    X1 and Y1 sinusoid are 50Hz and same phase.
    

    He found irregular AD633 device which showed W voltage shows under the calibration voltage.
    

    Please see the wave picture.
    

    Does the device violate the specifications?
    

    If the device is normal, could you advice the cause of this phenomenon?
    

     
    

    Best regards
    

    N.Kokubo
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Jul 8, 2021 1:47 AM
            
            
					
      
	
      

		
		
      
					
      Hi N.Kokubo,

      To further check your inquiry, may I know the test circuit used to obtain the result? I want to know if there are external components used like a load resistance.
      

      Also, may I know why these input values were chosen for the test?
      

      From what I see in the data you have given, your inputs are similar to the "Y Feedthrough" datasheet specification in which it says that if the output is less than +/-40mV (0.4%FS) then it is still acceptable.
      

      

      Best Regards,
      

      Sham
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Jul 12, 2021 9:58 AM
            
            
												
						in reply to Sham
					
									
        
	
        

		
		
        
					
        Hi Sham san
        

        Thank you for your reply.
        

        I can not ask our customer why you choice the test condition right now. 
        

        Could you advice me what "Y Feedthrough" and  ""the condition : X nulled" means? 
        

        Best regards
        

        N.Kokubo
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
			                            
                        
                on Jul 22, 2021 1:53 AM
            
            
												
						in reply to NKokubo131
					
									
        
	
        

		
		
        
					
        Hello N.Kokubo-san,
        

        Basically, to "null" means to "zero". 
        

        "Y Feedthrough" set-up in the datasheet have X=0V and  Y=+/-10V. 
        The expected output should be 0V. 
        But in reality, there is a certain percentage that goes through from "Y" input to the "W" output and that is "Y Feedthrough".  
        

        Best Regards,
        

        Sham
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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													+1
							
			
				
									
							        
			
			
			
        •  Analog Employees  
        
            
			                            
                        
                on Jul 22, 2021 1:53 AM
            
            
												
						in reply to NKokubo131
					
									
        
	
        

		
		
        
					
        Hello N.Kokubo-san,
        

        Basically, to "null" means to "zero". 
        

        "Y Feedthrough" set-up in the datasheet have X=0V and  Y=+/-10V. 
        The expected output should be 0V. 
        But in reality, there is a certain percentage that goes through from "Y" input to the "W" output and that is "Y Feedthrough".  
        

        Best Regards,
        

        Sham
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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