Products In This Thread

LTC2495 Production
The LTC2495 is a 16-channel (eight differential), 16-bit, No Latency  ?S™ ADC with Easy Drive technology and a 2-wire, I2C interface. The patented sampling...
Datasheet
LTC2495 on Analog.com

  • State Not Answered
  • Replies 1 reply
  • Subscribers 76 subscribers
  • Views 108 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
		
	
	
		

		
ltc2495 COM impedance



		

			

									
					    gjleeson
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 3, 2024 
				
			
			
		
    

				
		
    
		    		    
		    
		    		      		            		        
    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  LTC2495 
    
    		        		    		    	
			
    What is the input impedance (or drive requirements) for the COM input?  Can I connect this to Vref/2 in order to get full range on my single ended inputs?  If I ground COM and REF- then my single ended inputs have a full scale value of only Vref/2.
    
									
			                
    Thread Notes   
    
        
    
        
            
		
    

				
						
        

    
    Tags: 
                                            
                 Datasheet/Specs
                
                                                    
                 Multiplexed A/D Converters
                
                                                    
                 LTC2495
                
                                                    
                 Precision A/D Converters
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hello  , 
      

      The COM input impedance is the same as other analog inputs, as these "see" the same ADC input through the multiplexer. You certainly can connect a mid-supply VREF through COM, just make sure that the source impedance will be lower than 10k ohms to ensure proper settling.
      

      If you are experiencing accuracy issues due to input voltage not settling right, you may use an external buffer as shown below.
      

       
      

      Regards,
      

      Yugel
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

      •