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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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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Jun 6, 2016 12:32 PM
            
            
					
        
	
        

		
		
        
					
        Hi,
        
 
        Thank You for the reply.
        
 
        With respect to the points 1.a and 1.b, we are checking with our software team, will get back to you soon.
        
 
        2) Decoupling is clean and designed as per reference design.
        
 
        3) We will connect the DVI Input directly to the Monitors and observe the DVI OUTPUT once. Later we will update the observations.
        
 
        4) We will check for connection of DVI OUT of Card 14 directly to DVI Monitor. Later we will update the observations.
        
 
        5) We had done this before. We disconnected the DVI/VGA Input source from the card 14. later generated solid color patterns from FPGA (3 basic colors : Red, Green and Blue). No noise was observed on the DVI display.
        
 
        6) We are running SXGA(1280x1024) @60Hz. The 1.5 meter cables used in between the circular connectors are individual single ended cables and are not twisted. They are also not matched in length properly. Because of this reason can we expect any such noise patterns on DVI display ?
        
 
        There are some length difference of around 10 to 50 mm within the differential pairs in the cable set of 1.5 meter between 2 circular connector.
        
 
        We also observed the cable lengths between the differential pairs. Whether this type of length mismatches cause any similar noise effects ?
        
 
        Regards,
        
 
        Nanjunda M
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Jun 6, 2016 12:32 PM
            
            
					
          
	
          

		
		
          
					
          Hi,
          
 
          Thank You for the reply.
          
 
          With respect to the points 1.a and 1.b, we are checking with our software team, will get back to you soon.
          
 
          2) Decoupling is clean and designed as per reference design.
          
 
          3) We will connect the DVI Input directly to the Monitors and observe the DVI OUTPUT once. Later we will update the observations.
          
 
          4) We will check for connection of DVI OUT of Card 14 directly to DVI Monitor. Later we will update the observations.
          
 
          5) We had done this before. We disconnected the DVI/VGA Input source from the card 14. later generated solid color patterns from FPGA (3 basic colors : Red, Green and Blue). No noise was observed on the DVI display.
          
 
          6) We are running SXGA(1280x1024) @60Hz. The 1.5 meter cables used in between the circular connectors are individual single ended cables and are not twisted. They are also not matched in length properly. Because of this reason can we expect any such noise patterns on DVI display ?
          
 
          There are some length difference of around 10 to 50 mm within the differential pairs in the cable set of 1.5 meter between 2 circular connector.
          
 
          We also observed the cable lengths between the differential pairs. Whether this type of length mismatches cause any similar noise effects ?
          
 
          Regards,
          
 
          Nanjunda M
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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