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ADA4092-4 differential input voltage



		

			

									
					    Terumasa
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 12, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello 
    
 

    Please let me know about overvoltage protection (OVP) of ADA4092-4.
    
 
    Datasheet P. 6 tabel5 absolute maximum rating says below.
    Input Voltage: Refer to the Input Overvoltage Protection section
    Differential Input Voltage: ±VSY
    
 
    What is the difference between input voltage and differential input voltage ?
    Our customer asks if above means that OVP does not work when differential signal input is used,
    because customer uses ADA4092-4 in below condition.
    
 
    Operated condition
    5V single supply
    Input signa: 2.5V +-2.5V differential input
    
 
    (-10~+10V overvoltage protection is needed )
    
 
    Regards,
    Terumasa
    
									
			        
		
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Sep 18, 2014 7:45 AM
            
            
					
      
	
      

		
		
      
					
      Hi Terumasa,
      
 
      With your set up conditions, it clearly violates the absolute max rating for the differential input voltage stated on the datasheets and we really do not recommend that. However, based on figure 48 and 49, It shows that there is a differential protection diode and a series of 5 kohms resistors across its input. We are looking for a possibility that it may work, and maybe the datasheets just become too conservative. But I still need to confirm it to the designer or even measure it on the lab to verify this. This may take a one or two weeks but I will get back to you as soon as I can.
      
 
      Best regards,
      
 
      Emman
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Sep 18, 2014 7:45 AM
            
            
					
      
	
      

		
		
      
					
      Hi Terumasa,
      
 
      With your set up conditions, it clearly violates the absolute max rating for the differential input voltage stated on the datasheets and we really do not recommend that. However, based on figure 48 and 49, It shows that there is a differential protection diode and a series of 5 kohms resistors across its input. We are looking for a possibility that it may work, and maybe the datasheets just become too conservative. But I still need to confirm it to the designer or even measure it on the lab to verify this. This may take a one or two weeks but I will get back to you as soon as I can.
      
 
      Best regards,
      
 
      Emman
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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