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AD5686R operation with GAIN=2



		

			

									
					    EVoyager
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 1, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    Request your help to understand why the gain error is improving with Gain=2 compared to Gain=1?
    
 
    Also with Vref=2.5V & Gain=2, what should be the minimum VDD requirement to get output of 3V?
    
 
    I have seen Vref+1.5 as the minimum power supply required, is it still valid even if the max output needed is 3V?
    
 
    Thanks
    
 
    Shihab.
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Mar 5, 2018 10:42 PM
            
            
					
      
	
      

		
		
      
					
      Hi Shihab,
      
 
      Apologies for the late response. What you observe is possible as the resistors with gain of 1 are not perfectly matched. For your second question, you could add around 10mV headroom above 3V output as the minimum Vdd.
      
 
      And for the third one, let me ask around to clearly answer that question and will get back to you. Hope that helps!
      
 
      Cheers,
      
 
      Ivan
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Mar 5, 2018 10:42 PM
            
            
					
      
	
      

		
		
      
					
      Hi Shihab,
      
 
      Apologies for the late response. What you observe is possible as the resistors with gain of 1 are not perfectly matched. For your second question, you could add around 10mV headroom above 3V output as the minimum Vdd.
      
 
      And for the third one, let me ask around to clearly answer that question and will get back to you. Hope that helps!
      
 
      Cheers,
      
 
      Ivan
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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