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ADUCM360 Recommended for New Designs
The ADuCM360 is a fully integrated, 3.9 kSPS, 24-bit data acquisition system that incorporates dual high performance, multichannel sigma-delta (S-?) analog...
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ADUCM360 on Analog.com

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ADuCM360 Internal Difference Amplifier for current sensing

		
	
				

			

									
					    circuits
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 28, 2015 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    I have a ADuCM360 using which i would like to monitor the voltage across a 100mOhm current sense resistor. Is it possible to connect the two terminals of the resistor directly to the MCU ? E.g. current in terminal to AIN0 and current out terminal to AIN1 ? Will the internal differential amps detect the voltage difference across the resistor ?
    
 
    (Assuming the current is not exceeding 500mA)
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 28, 2015 5:00 PM
            
            
						
			            		
      
		
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      Hi,
      
 
      Yes you can use ADuCM360 to monitor voltage for your current sense resistor however you have to protect the input pins if your passing a huge amount current.
      
 
      Please be aware of the ADC input current which can cause some drift on your measurement. You will find the input current values for Buffered and Unuffered Mode on page 7 of ADuCM360 Rev C datasheet. You'll also find the ADC input current for different Common Mode Voltages on figures 9 and 10 on page 22 of ADuCM360 Rev C datasheet.
      
 
      Regards,
      
 
      Mark
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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