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AD8221 Production
The AD8221 is a gain programmable, high performance instrumentation amplifier that delivers the industry’s highest CMRR over frequency in its class. The...
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AD8221 on Analog.com

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AD82221 Single Supply Operation



		

			

									
					    wolfhorton
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 21, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  AD8221 
    
    		        		    		    	
			
    I would like to use the AD8221 with +Vs = 10V and -Vs = 0V.
    

    The AD8221 datasheet has the following statement:
    

     
    

    This implies that the configuration I am targetting is valid.
    

    Unfortunately if I try to simulate this in LTSpice, the simulation fails unless I tie -Vs to at least about -2.5V. So is the single supply configuration not actually valid, despite what the datasheet claims?
    

    Thanks,
    

    Eric
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 amplifiers
                
                                                    
                 hardware
                
                                                    
                 Instrumentation Amplifiers
                
                                                    
                 ad8221
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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                on Mar 21, 2023 3:54 PM
            
            
					
        
	
        

		
		
        
					
        Additional update -- the simulation runs well with +Vs=10V and -Vs tied to ground through a 1p Ohm resistance, but fails if -Vs is tied directly to ground. A 1pico-Ohm resistance is arbitrarily small, so I am happy with these simulation results.
        

        

        That being said, it would still be nice for an ADI expert / applications engineer to confirm that the single supply operation is a valid operating condition. It is suggested that it is in the single datasheet statement, however there is no other statements / references to this configuration listed. 
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Mar 21, 2023 3:54 PM
            
            
					
          
	
          

		
		
          
					
          Additional update -- the simulation runs well with +Vs=10V and -Vs tied to ground through a 1p Ohm resistance, but fails if -Vs is tied directly to ground. A 1pico-Ohm resistance is arbitrarily small, so I am happy with these simulation results.
          

          

          That being said, it would still be nice for an ADI expert / applications engineer to confirm that the single supply operation is a valid operating condition. It is suggested that it is in the single datasheet statement, however there is no other statements / references to this configuration listed. 
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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