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ADV7511W Recommended for New Designs
The ADV7511W is a 165 MHz High-Definition Multimedia Interface (HDMI™) transmitter, which is ideal for automotive infotainment applications. The digital...
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ADV7511W on Analog.com

ADV7441A Not Recommended for New Designs
The ADV7441A is a high quality multiformat video decoder and graphics digitizer with an integrated 2:1 multiplexed HDMI™ receiver. The ADV7441A contains...
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ADV7441A on Analog.com

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Noise in the DVI Output of ADV7511W



		

			

									
					    NanjundaM
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 2, 2016 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    We are using ADV7511WBSWZ for DVI Output in our board. The set up is as shown in the attached image.
    
 
    The cables used for connection are shielded.
    
 
    We have observed that, there are white blinking dots on the output (On Monitor).
    
 
    We tried to display only one primary color(any of the three) bar on the screen, with darker color the dots are not visible, but with lighter shades of the same color( with mix of other two primary color) dots are visible.
    
 
    Have anyone have come across this kind of issue ?
    
 
    Please help us to solve this issue ASAP.
    
 
    Thanks & Regards,
    
 
    Nanjunda M
    
								
    

							
    
				
				
			
    
					
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      •  Super User  
      
            
			                            
                        
                on Jun 20, 2016 5:17 PM
            
            
					
      
	
      

		
		
      
					
      Twisted pairs like this will introduce impedance mis-match and allow a point for noise to couple in.  I once had a system where a bad ballast in the overhead fluorescent light was injecting noise into the system.  (i.e. The system would only work in the dark)
      
 
      The twisted pair probably does not maintain the 100 Ohm differential spec'd for HDMI.  
      
 
      Another possible noise source is a ground loop.  If the cable has a shield, try disconnecting the shield at one end or the other.  This assumes there is still a ground wire in the cable.
      
 
      Also is the P2/J2 and RTM/RTM connector rated for 1GHZ 100 Ohm differential?
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      •  Super User  
      
            
			                            
                        
                on Jun 20, 2016 5:17 PM
            
            
					
      
	
      

		
		
      
					
      Twisted pairs like this will introduce impedance mis-match and allow a point for noise to couple in.  I once had a system where a bad ballast in the overhead fluorescent light was injecting noise into the system.  (i.e. The system would only work in the dark)
      
 
      The twisted pair probably does not maintain the 100 Ohm differential spec'd for HDMI.  
      
 
      Another possible noise source is a ground loop.  If the cable has a shield, try disconnecting the shield at one end or the other.  This assumes there is still a ground wire in the cable.
      
 
      Also is the P2/J2 and RTM/RTM connector rated for 1GHZ 100 Ohm differential?
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

      • 


    


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