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Input Impedance of AD8207, purely resistive?



		

			

									
					    MSchrey
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 24, 2012 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi All!
    
 
    To estimate the effect of connecting an AD8207 Difference Amplifier I'd like to know its differential input impedance. The data sheet only states the resistive part of 240kOhms. I find it hard to believe the input impedance has no capacitive part to it. 
    
 
    Does someone have more information regarding this issue?
    
 
    Greets, Moritz
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Sep 6, 2012 11:39 PM
            
            
					
      
	
      

		
		
      
					
      Hello Moritz,
      
 
      You are correct to point out that there will be a reactive component associated with the input impedance. The fact that is missing on the data sheet means that it wasn't characterized. This is usually an indicator that it is not a concern for the typical applications for this amplifier, which is mostly meant to interface to low-impedance sources.
      
 
      Could you describe your application? Are there additional details that you would feel comfortable sharing so we can help you recommending a better solution?
      
 
      Thanks,
      
 
      Gustavo
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Aug 2, 2018 4:38 PM
            
            
					
      
	
      

		
		
      
					
      This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

      Thank you,
      EZ Admin
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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