Products Mentioned

ADV7181 Obsolete
The ADV7181, part of ADI's new generation of integrated video decoders automatically detects and converts a standard analog baseband television signal...
Datasheet
ADV7181 on Analog.com

ADV7181D Not Recommended for New Designs
The ADV7181D is a high quality, single-chip, multiformat video decoder and graphics digitizer. This multiformat decoder supports the conversion of PAL...
Datasheet
ADV7181D on Analog.com

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					    Hareesh
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 23, 2024 
				
			
			
		
    

				
		
    
		    		    
		    
		    		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  ADV7181D  
    
    		        		    		    	
			
    Please someone explain me that 
    

    What are possible the reason for that, video decoder out got default data while no input. but here we are giving analog input and that time also decoder giving default digital data. (here all recommended electronic connections are made as per data sheet).
    
									
			        
		
    

				
						
        

    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on May 24, 2024 9:43 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      Do you have one of our evaluation board?
      

      Which scripts are you using?
      

      If you've designed your own board, check the input analog path impedance. Does your input circuit match the reference design from the data sheet?
      

      Check whether free run works correctly.
      

      Free Run mode is intended to provide the user with a stable clock and predictable data if the input signal cannot be decoded/lost i.e input video is not present. It controls the default color insertion and it causes the ADV7181D to generate a default clock.
      

      Thanks,
      

      Varshini K
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on May 26, 2024 12:40 PM
            
            
												
						in reply to VarshiniK
					
									
        
	
        

		
		
        
					
        Tqs for the response Mam. 
        

        But video not coming properly like as input while doing video decoder video encoder loop back. Some blue screen data is coming on display. Separately We checked Encoder also, it is working properly. 
        

        What ever video data from decoder is coming from camera is properly coming but some blue screen related data is came out from decoder data lines even camera is connected to it.  
        

        What are the possible reasons for that. 
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
						
                            
            
            				
            
                on May 27, 2024 7:41 AM
            
            
												
						in reply to Hareesh
					
									
        
	
        

		
		
        
					
        Hi,
        

        Check out the lock bits in Status 1 & 3 (0x10, 0x13).
        

        Are you using any specific script from ADV7181D Design Support Files ?
        

        Are you using our evaluation board for the ADV7181D?
        

        

        Thanks,
        

        Varshini K
        

        

        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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