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The AD8231 is a low drift, rail-to-rail, instrumentation amplifier with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128. The gains are programmed...
AD8231 on Analog.com

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Question about extra op amp input impedance

		
	
				

			

									
					    vcbart
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 9, 2024 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about the input impedance of the extra op amp in the AD8231 datasheet, noting that it is not specified. The final answer clarifies that the input impedance of the op amp is different from the in-amp's 10G ohm and 5 pF, and that specific information for the op amp's input impedance is not readily available.
                        	    
    
                
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    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  AD8231  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello
    

    The AD8231 datasheet does not seem to specify the input impedance of the extra op amp. The instrumentation amplifier states an input impedance of 10G ohm and 5 pF. However the op amp section of the datasheet does not specify the input impedance of the extra op amp. Is the input impedance to the extra op amp the instrumentation amplifier inputs?
    

    

    Vs = 5.0 V:
    

     
    

    

    Vs = 3V:
    

     
    
			
    
			
									
		                             
                        

    
    
                                            
                 Operational Amplifiers (Op Amps)
                
                                                    
                 Datasheet/Specs
                
                                                    
                 amplifiers
                
                                                    
                 Instrumentation Amplifiers
                
                                                    
                 ad8231
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	


    

	
			
    

    





		
    
		
    
			
      
				
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