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ADV8005 Recommended for New Designs
The ADV8005 is a multiple input video signal processor that can deinterlace and scale standard definition (SD), enhanced definition (ED), or high definition...
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ADV8005 on Analog.com

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How to connect ADV8005 PIN N23/W23



		

			

									
					    Tommy_chen
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 16, 2015 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi
    
 
    Base on  ADV8005_PRA, N23/W23 should connect to 1.8V,
    
 
    But from the reference design(SCH and PCB),these two Pins no connection.
    
 
    How to connect these two Pins?
    
 
    On my board, I connect these 2 pins to 1.8v
    
 
    Now I meet a issue,  TX 4K output not worked (TX Pll not locked, even for PVSP 4K freerun),  but 4K input works well (for example 4K to 1080P)
    
 
    I already checked and improve the power ripple
    
 
    I wonder if the issue related with these 2 pins connection
    
 
    Thanks
    
 
    Tommy
    
									
			        
		
    

				
						
        

    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 16, 2015 5:20 PM
            
            
					
      
	
      

		
		
      
					
      Hi Tommy,
      
 
      According to the ADV8005 datasheet:
      
 
      * N23 is AVDD3 and should be connected to 1.8V
      
 
      * W23 is AVDD4 and should be connected to 1.8V
      
 
      Regarding our schematic for EVAL-ADV8005-SMZ, it is a little confusing because we are still using a PCB we originally designed for ADV8003. On that board, N23 and W23 are shorted together and connected to 3.3V through a Do Not Populate resistor. Even this connection was left over from ADV8002, and not needed for ADV8003. For ADV8003, N23 should be No Connect and W23 should be No Connect.
      
 
      Our ADV8003 board with N23 shorted to W23 but left floating otherwise seems to work okay for ADV8005 but I would not recommend this configuration. I would recommend sticking with the configuration shown in the ADV8005 datasheet.
      
 
      We plan to design a new PCB for ADV8005 in 2015.
      
 
      -Matt
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 16, 2015 5:20 PM
            
            
					
      
	
      

		
		
      
					
      Hi Tommy,
      
 
      According to the ADV8005 datasheet:
      
 
      * N23 is AVDD3 and should be connected to 1.8V
      
 
      * W23 is AVDD4 and should be connected to 1.8V
      
 
      Regarding our schematic for EVAL-ADV8005-SMZ, it is a little confusing because we are still using a PCB we originally designed for ADV8003. On that board, N23 and W23 are shorted together and connected to 3.3V through a Do Not Populate resistor. Even this connection was left over from ADV8002, and not needed for ADV8003. For ADV8003, N23 should be No Connect and W23 should be No Connect.
      
 
      Our ADV8003 board with N23 shorted to W23 but left floating otherwise seems to work okay for ADV8005 but I would not recommend this configuration. I would recommend sticking with the configuration shown in the ADV8005 datasheet.
      
 
      We plan to design a new PCB for ADV8005 in 2015.
      
 
      -Matt
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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