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[ADV748x] About RX_5V_VBUS pin pull-down resistor



		

			

									
					    tatsuya_sato
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 26, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    

    There is the following description on page 143 of ADV748x_HardwareManual_RevPrB_2014-07-11.pdf.
    

    "Important: When using the RX_5V / VBUS pin on the ADV748x, a large pull down resistor (100kΩ typical) to ground should be connected to this pin."
    

    Why do we need a 100kΩ pull-down resistor?
    

    

    Best regards.
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Oct 26, 2021 4:39 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

        As already stated "100 Ohm series resistor in combination with internal ESD will protect the input against any ESD hits on the connector".
      

       By connecting this way the ESD energy would get absorbed in the resistor instead of damaging the silicon.  Also an ESD protection circuit in front 100 Ohm resistor would help even more (digital inputs utilize a 100 Ohm series resistor for ESD protection)
      

      

      Thanks,
      

      Poornima
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Oct 26, 2021 4:39 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

        As already stated "100 Ohm series resistor in combination with internal ESD will protect the input against any ESD hits on the connector".
      

       By connecting this way the ESD energy would get absorbed in the resistor instead of damaging the silicon.  Also an ESD protection circuit in front 100 Ohm resistor would help even more (digital inputs utilize a 100 Ohm series resistor for ESD protection)
      

      

      Thanks,
      

      Poornima
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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