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The OP282/OP482 dual and quad operational amplifiers feature excellent speed at exceptionally low supply currents. Slew rate exceeds 7 V/µs with supply...
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OP482 on Analog.com

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Common mode input range for lower voltages

		
	
				

			

									
					    AjejeBrazof
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 29, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about the common-mode input voltage (Vcm) range for the OP282/OP482 when supplied with ±4.5V and 12V/0V. The support engineer confirmed that the Vcm range is from -0.5V to 4.5V for ±4.5V supplies and from 4V to 12V for 12V/0V supplies, with a fixed 4V input voltage foot room and 0V head room. The user clarified that the 4V foot room is a hard limit and does not scale with supply voltage.
                        	    
    
                
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    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  OP482  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hi there,
    

    by looking at the OP282/OP482 datasheet, I take the Vcm is -11V when the IC is supplied with +-15V. 
    My questions is what is the limit when the part is supplied with a lower voltage - for example with +-4.5V (the PSRR is tested with that supply range). Or, as in my case, when the part is supplied between 12V and 0V.

    

    Is the Vcm 4V higher than the lowest supply or it scales down proportionally with lower supply voltages?
    

    

    Regards
    

    Ajeje
    
			
    
			
									
		                             
                        

    
    
                                            
                 Operational Amplifiers (Op Amps)
                
                                                    
                 Datasheet/Specs
                
                                                    
                 Common mode Voltage range
                
                                                    
                 OP482
                
                                                    
                 Low Input Bias Current Op Amps (≤100 pA)
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 31, 2025 2:42 AM
            
            
						
			            		
      
		
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      Hello ,

      OP282/OP482 has an input voltage foot room of 4V (Vcm_min-(-Vs)) and an input voltage head room of 0V (+Vs-Vcm_max)at Vs = ± 15V as can be seen on the data sheet:
       

      Following the data above, we can now estimate new Input Voltage Ranges at other supply voltages. If the supplies are ±4.5V, the new Input Voltage Range will be from -0.5V (-Vs+4V) to 4.5V (+Vs-0). On the other hand, when supplied with 12V and 0V or GND (Single-Supply) the new Input Voltage Range will be from 4V (-Vs+4V) to 12V (+Vs-0).

      I hope these help.

      Best regards,
      Paul
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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                on Jul 31, 2025 2:48 AM
            
            
												
						in reply to PaulCA
					
										
			            		
        
		
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        Hi Paul,
        

        thanks for your reply. Yes, the numbers in your reply match my initial post.
        So following your answer: Vs+4V limit is a 'hard limit' independent of the supplies (it does not scale down with lower supplies).

        Thanks for the info, ideally this info could be added onto the next datasheet revision.
        

        

        Regards
        

        AB
         
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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