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ADV7280 Not Recommended for New Designs
The ADV7280 / ADV7280-M are versatile one-chip, multiformat video decoders. The ADV7280 / ADV7280-M automatically detect standard analog baseband video...
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[ADV7280] how to improve video quality



		

			

									
					    amaiga
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 3, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  ADV7280 
    
    		        		    		    	
			
    Dear all,
    

    using a color bar pattern generator, we inject the CVBS signal to AIN1 port of the ADV7280.
    

    The digitalized signal is get by an iMX6 solo processor.
    

    From the attached video, we can see some flicker and noise on the color bar.
    

    How can we improve this image?
    

    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      •  Super User  
      
            
			                            
                        
                on Aug 3, 2022 1:47 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      Please make sure whether ADV7280-M is programmed correctly with ADI recommended I2C writes,
      Also make sure the power rails to the ADV728x are clean and stable.
       Please ensure with good ground connections on the board i. ground plane.
      

      Note: "ADI recommended Write" - if those writes are not included, the part would not work reliably (unless those values are default anyway). Those registers are generally internal settings that let us handle process variation which is why they are determined during characterization. The settings that show up as "ADI Recommended Settings" are the values that work reliably across voltage and temperature. They really should be called "ADI Required setting.
      

      In this applications note AN-1337 at AN-1337 with covers most of the issues that customers encounter when interfacing the ADV728x-M family of parts with MIPI receivers.
      

      

      Thanks,
      

      Poornima
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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