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OpAmp selection table: rail-to-rail option misunderstanding

		
	
				

			

									
					    Pavel47
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 19, 2022 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		        		    		    
    
		    		    
		    			
    
			    
    Hello,
    

    In the selection table for OpAmps for there are 3 values for "rail-to-rail" option:
    

      

    • Both
      • 

    • In to V-
      • 

    • Output
      • 

    

    While the first two is quite comprehensive ("true rail-to-rail" and "negative-only-rail" consequently), the 3rd I didn't understand.
    

    What "Output" rail-to-rail mean exactly ?
    

    Thanks
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 24, 2022 1:39 AM
            
            
												
						in reply to Pavel47
					
										
			            		
      
		
										+1
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hello ,

      Rail-to-rail is a term used to describe an OpAmp that is capable of swinging near its supply voltages. This can refer to either the output or both the input and output of an OpAmp.
      

      Output rail-to-rail means that the OpAmp's output can operate or swing near the positive and negative supply voltage rails. If we say that the OpAmp's output is rail-to-rail, it means that it is capable of driving its output very close to the supply rails regardless of whether its input is also rail-to-rail or not.

      Regards,
      Paul
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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