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AD8675 LTspice XVll model  versus model AD8675 spice model



		

			

									
					    BSI
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 4, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Dear sir

    I experiment a different behavior regarding input bias current in AD8675 amplifier according models I use with LTSPICE.

    When I simulate the AD8675 component using the model provided with LT SPICE XVll software, I get perfect match with datasheet regarding current in input of the amplifier (typically 500pA) .

    When I simulate AD8675 component using the model provided on the website of AD, ( file ad8675.cir) I get  a current in input of the amplifier that is 10 times higher than the datasheet (6nA).

    Why there is a such difference. on What model I can rely?

    Best regards,


    Bruno  
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Dec 10, 2020 1:18 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      The AD8675 has two types of models, first is the LTspice optimized model which is provided in LTspice library and second is the downloadable from the web which is a PSPICE compatible model. Thanks for pointing out about the error in bias current of AD8675 model downloaded from the web, we'll fix it. The LTspice model in the LTspice library gave you the correct bias current so you can use it in this specific application. 
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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