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AD7124-8 Recommended for New Designs
The AD7124-8 is a low power, low noise, completely integrated analog front end for high precision measurement applications. The AD7124-8 W grade is AEC...
Datasheet
AD7124-8 on Analog.com

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The imput impedance of AD7124-8

		
	
				

			

									
					    monica-43
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 18, 2016 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about the input impedance of the AD7124-8, which is not directly specified in the datasheet. The input current is provided instead: +/-1nA for low power mode, +/-1.2nA for mid power mode, and +/-3.3nA for full power mode when buffered. For unbuffered operation, the input current is +/-2.65uA/V. The input buffers are automatically enabled for Gain > 1, allowing the device to handle significant source impedances.
                        	    
    
                
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    Hi,
    
 
    Could anyone tell me what the imput impedance of AD7124-8 would be?
    
 
    I could not find any infomation about it on its data sheets.
    
 
    Thanks!
    
			
    
			
									
		                             
                        

    
    
                                            
                 ad7124-8
                
                                                    
                 Multiplexed A/D Converters
                
                                                    
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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Oct 17, 2016 2:26 PM
            
            
						
			            		
      
		
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      Hi,
      
 
      We list the input current specification rather than specify the input impedance. The input impedance can be calculated from this input current specification. When buffer is enabled, the absolute input current is +/-1nA for low power mode, +/-1.2nA for mid power mode and +/-3.3nA for full power mode. With Gain > 1, the input buffers are automatically enabled. Thus, it can handle any significant source impedances which allows external filtering necessary in your application. When, un-buffered the absolute input current is +/-2.65uA/V. These values can be found in datasheet specification section.  
      
 
      Thanks,
      
 
      Jellenie
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Aug 2, 2018 11:37 AM
            
            
						
			            		
        
		
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        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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