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LTC2494 / 95 differential input configuration



		

			

									
					    tonigau
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 6, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I2C serial ADC LTC2494 / LTC2495.
    
 
    I am making 8x differential measurements via resistor divider of inputs that are connected in series, I will need to connect together inputs 14-13, 12-11, 10-9, 8-7, 6-5, 4-3, 2-1 (reference to Table 3 of datasheet) to enable individual measurements. Uses 16 pins
    
 
    No issues?
    
 
    It would be good if I could configure the input multiplexer to use just 9 pins for 8 channels ?...
    
 
    in15-- in14, in14--in13, in13--in12, in12-- in11, in11--in10, in10--in9, in9--in8, in8--in7
    
 
    This would use just 9 input pins.
    
 
    I can make a drawing of connection if it needed.
    
 
    Thanks
    
 
    Toni
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Jun 7, 2018 12:42 AM
            
            
					
      
	
      

		
		
      
					
      Toni,
      
 
      I don't see an issue with what you propose in your first paragraph.
      
 
      In your second paragraph, consider making individual channel measurements one at a time and then subtracting them to get ch 15 - ch 14, ch 14- ch 13, etc.  Have a look at the lower half of Table 3; each measurement is taken WRT the COM pin.  If time permits, that would work.
      
 
      Doug (apps for the LTC2494/2495)
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Aug 24, 2018 12:51 PM
            
            
					
      
	
      

		
		
      
					
      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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