Products Mentioned

AD8418 Recommended for New Designs
The AD8418 is a high voltage, high resolution current shunt amplifier. It features an initial gain of 20 V/V, with a maximum ±0.15% gain error over the...
Datasheet
AD8418 on Analog.com

AD8418A Recommended for New Designs
The AD8418A is a high voltage, high resolution current shunt amplifier. It features an initial gain of 20 V/V, with a maximum ±0.15% gain error over the...
Datasheet
AD8418A on Analog.com

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What is a difference between AD8418 and AD8418A?



		

			

									
					    moto
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 28, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi
    
 
    I checked the AD8418 and A datasheet.
    
 
    Those are almost same, but those actual features seems a little different.
    
 
    What feature has improved?
    
 
    Regards
    
 
    moto
    
 
    I checked again. Figure 3 to 25 are totally different. Slew rate , Gain vs Freq, bias current and output sink current etc... Sorry, I misunderstood. Those are totally different circuit, I think. How come those are same name? Please tell us how to select A or non A. Those are for different application? Regards moto 
    
									
			        
		
    

				
						
        

    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 27, 2014 7:34 PM
            
            
					
      
	
      

		
		
      
					
      Hi moto, 
      
 
      Apart from the changes in the spec, the main difference between the AD8418 and the AD8418A is that the AD8418A has a faster common mode settling time. You can check Figure 18 of both parts. Notice that for the AD8418, it takes a little over 2us to settle, while for the AD8418A it takes less than a microsecond. I would say that if you have an application where the common mode changes quicker than usual, the AD8418A would be the better choice.  
      
 
      I hope this helps!
      
 
      Kris
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Apr 28, 2014 8:50 AM
            
            
					
        
	
        

		
		
        
					
        Dear Kris
        
 
        Thank you very much for prompt answer.
        
 
        the application that Common mode changes quicker.
        
 
        You mean, AD8418A is good for motor current measurement like as Figure 33 ?
        
 
        so, AD8418 is for High side sw? or low side sw, like s Figure 34,35.
        
 
        Thank you for your help.
        
 
        Regards
        
 
        moto
        
 
        Figure34 and 35 also common mode change quickly when sw off. AD8418 is for Figure 36? 
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
				
						
				
				
		
		
        
			
		
        
	
        

        

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