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ADG5208F



		

			

									
						ta-hayashi
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Jul 22, 2015 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hello,

 
I have the question about ADG5208F.

 
Q.How does it work, if it has follow status?

 
　Vcc =24V

 
　Input = 5V

 
　Signal = switch ON

 
　D = GND

 
In this case, it connected for the OPAMP .

 
The customer want to not get the damage, when the OPAMP's voltage is GND level by supply voltage is shutdown.

 
best regards

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			








	
	
	
	



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													0
							
			
				
									
							        
            
                                    			
			                            
                        
                on Jul 31, 2015 9:46 AM
            
            
					
    
	
    

		
		
    
					
    The AD8613 has an absolute maximum rating for the input current of 10mA (page 5 of the data sheet).
    
 
    You should limit the current through the input protection diodes to less than that.
    
 
    This can be done very easily in your circuit by adding a series resistor between Dx and the input of the OPAMP.
    
 
    10k Ohm would be a good value since the bias current of the OPAMP is only 780 pA worst case.
    
 
    The added offset voltage generated by this would be far less than the offset of the OPAMP itself.
    
 
    Klaus
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                    			
			                            
                        
                on Jul 31, 2015 9:46 AM
            
            
					
    
	
    

		
		
    
					
    The AD8613 has an absolute maximum rating for the input current of 10mA (page 5 of the data sheet).
    
 
    You should limit the current through the input protection diodes to less than that.
    
 
    This can be done very easily in your circuit by adding a series resistor between Dx and the input of the OPAMP.
    
 
    10k Ohm would be a good value since the bias current of the OPAMP is only 780 pA worst case.
    
 
    The added offset voltage generated by this would be far less than the offset of the OPAMP itself.
    
 
    Klaus
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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