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ADV7321 Not Recommended for New Designs
The ADV7321 is a digital-to-analog video encoder for standard definition, progressive scan and high definition video. It converts a wide variety of digital...
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ADV7321 on Analog.com

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Super-black signal is disappeared



		

			

									
					    digital
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 10, 2011 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi Anyone,
    
 
    We want to know a functionality or effect for SD SAV/EAV Step Edge Control bit in SD Mode Register 1 (0x42, Bit7) of ADV7321.
    
 
    Could you please explain a functionality when the bit enable or disable?
    
 
    When we should use this bit? We understand, if this bit is enabled then ringing effect is suppressed.
    
 
    When we enable this bit, we observed a super-black is omitted on a output signal.
    
 
    We are feeding video data of between 0x01 to 0x0F to ADV7321.
    
 
    After that, we can not see super-black signal on output of ADV7321 when the Step Edge Control bit is enabled. Why?
    
 
    Thank you
    
 
    -digital
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Jun 10, 2011 7:30 PM
            
            
					
      
	
      

		
		
      
					
       Hi Digital,
      
 
      As you correctly point out, the edge control bit is used to reduce ringing on fast edges (Reg 0x42 [7] on ADV7321). However, this bit also controls our support for blacker than black video. When this bit is enabled you will not see video out for video data between 0x01 and 0x0F (blacker than black).
      
 
      So in summary, we can only support either blacker-than-black or slope-edge-control on any of our ADV7310/734X/739X/732X  encoders.
      
 
      Regards,
      
 
      Paul
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Jun 10, 2011 7:30 PM
            
            
					
      
	
      

		
		
      
					
       Hi Digital,
      
 
      As you correctly point out, the edge control bit is used to reduce ringing on fast edges (Reg 0x42 [7] on ADV7321). However, this bit also controls our support for blacker than black video. When this bit is enabled you will not see video out for video data between 0x01 and 0x0F (blacker than black).
      
 
      So in summary, we can only support either blacker-than-black or slope-edge-control on any of our ADV7310/734X/739X/732X  encoders.
      
 
      Regards,
      
 
      Paul
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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