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What's the input resistance of ADA8691?

		
	
				

			

									
					    hulala
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jul 26, 2013 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
Hi,

 
I'm trying to connect the ADA8691 amplifier with ADMP411 microphone, but I can't find the input resistance of the amplifier. Thanks,

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 30, 2013 1:13 PM
            
            
						
			            		
    
		
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    Hi hulala, 
    
 
    Just to follow up with this.. I heard back from the engineer of this part. The AD8691 is one of the older parts so unfortunately, it does not have Rin specs. However, its Ibias spec of 1pA should clue you in that it has very high input impedance. It is safe to assume a value in the high Mohms or Gohms range. 
    
 
    I hope this helps!
    
 
    Kris
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 30, 2013 1:13 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi hulala, 
    
 
    Just to follow up with this.. I heard back from the engineer of this part. The AD8691 is one of the older parts so unfortunately, it does not have Rin specs. However, its Ibias spec of 1pA should clue you in that it has very high input impedance. It is safe to assume a value in the high Mohms or Gohms range. 
    
 
    I hope this helps!
    
 
    Kris
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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