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ADuM1401 output drive



		

			

									
						jouni
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Apr 12, 2016 
				
			
			
		


				
		

		    		    
		    
		    	
			
Can anyone clarify what ADuM1401 side 1 drive value is? The data sheet tells only Absolute Maximum Ratings:

 
Average Output Current per Pin -18mA to + 18 mA

 
There are two ways to read this:

 
average/pin (3 outputs on this side) is max. 18 mA, total 54 mA OR

 
max. for each 18 mA in averaged in time.

 
Then there is a table of max. supply/side but this is much higher and contains dynamic part.

 
What will happen in time if one is loaded with 20 mA and other two have no load?

 
Jouni

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	















	

	

					



			


				
	









	
    
	

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                                 Analog Employees 
                                
                            
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                on Apr 13, 2016 10:21 PM
            
            
					
    
	
    

		
		
    
					
    Hi Jouni:
    
 
    +-18mA is the current limit from safety requirement which means the maximum allowed current flow when a isolation failure happens.
    
 
    the suggested load current limit is 4mA.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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                on Apr 14, 2016 3:03 PM
            
            
					
    
	
    

		
		
    
					
    I did not find anywhere mentioned operational limit. This 4 mA was mentioned where the voltage drop/rise was specified at some currents. Typically max. usable current would be half from absolute max. ratings but the voltage levels would suffer. If we don't care about the voltage drop or speed is there any other reason to drive say 10mA? Also, this is on 'inside' part of design so we try not to have to add buffers to drive this 10mA/side.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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