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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 29, 2013 7:15 PM
            
            
						
			            		
    
		
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    Hi hulala, 
    
 
    Because the AD8691 is a CMOS amplifier, it should have very high input impedance. I do not think there will be any problems with interfacing this to the ADMP411. I have communicated with the engineer of this part to try and see whether I can provide you a typical value of its input impedance. I'll get back to you on this.  
    
 
    Thanks!
    
 
    Kris
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 29, 2013 7:15 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi hulala, 
    
 
    Because the AD8691 is a CMOS amplifier, it should have very high input impedance. I do not think there will be any problems with interfacing this to the ADMP411. I have communicated with the engineer of this part to try and see whether I can provide you a typical value of its input impedance. I'll get back to you on this.  
    
 
    Thanks!
    
 
    Kris
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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