Products Mentioned

OP296 Production
The OP196 family of CBCMOS operational amplifiers features micropower operation and rail-to-rail input and output ranges. The extremely low power requirements...
Datasheet
OP296 on Analog.com

OP196 Production
The OP196 family of CBCMOS operational amplifiers features micropower operation and rail-to-rail input and output ranges. The extremely low power requirements...
Datasheet
OP196 on Analog.com

OP496 Production
The OP196 family of CBCMOS operational amplifiers features micropower operation and rail-to-rail input and output ranges. The extremely low power requirements...
Datasheet
OP496 on Analog.com

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OP296 input resistance

		            
		

			

									
					    mateohg93
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 10, 2014 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    	
			
    Hi, i would like to know the OP296 input resistance. I was wondering if the OP296 works as a transimpedance amplifier with a 1M feedback resistance (so i need that value). any advice?. 
    
 

    
 
    And the same question for ADA4528.
    
 
    Thanks.
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Operational Amplifiers (Op Amps)
                
                                                    
                 amplifiers
                
                                                    
                 transimpedance
                
                                                    
                 Low Power Op Amps (≤ 1mA/amp)
                
                                                    
                 op196
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
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							FormerMember
					
      
		
      
			
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									FormerMember
							        
			
			
			
    
            
						
                            
            
            				
            
                on Sep 10, 2014 7:00 PM
            
                                    
					
    
	
    

		
		
    
					
    Mateo,
    
 
       How were you going to use input resistance?   It's generally of limited usefulness
    
 
    and for a voltage follower, the input resistance is bootstrapped by the open loop gain
    
 
    at that frequency.  For error calculations, input bias current can be used.
    
 
      I would not do a new design with the OP296 which came out in 1995.  I would use the next generation,
    
 
    ADA4096-2.
    
 
    Harry
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    


	

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                on Sep 11, 2014 7:49 AM
            
                                    
					
      
	
      

		
		
      
					
      Hello,
      
 
      the worst case input bias current of the OP296 is +-50nA, which you have to add or deduct from the current of your source (a photodiode, for example). Say, your photodiode sources 500nA then you expect 0.5V at the output of your opamp. In a worst case situation you will only get 0.45V or even 0.55V.
      
 
      The input offset current is not included in the calculation.
      
 
      Best regards,
      
 
      Reinhard
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Aug 2, 2018 10:45 AM
            
                                    
					
        
	
        

		
		
        
					
        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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