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The AD723 is a low cost RGB-to-NTSC/PAL encoder that converts analog red, green, and blue color component signals into their corresponding luminance and...
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AD723 on Analog.com

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The color burst from AD723 seems to move on AD723 Eval Board.

		
	
				

			

									
					    Tamu
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 28, 2013 
				
			
			
		
    
		
		                    	    
    
        	    
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                The user inquired about the variability of the color burst start point on the AD723 Eval Board (AD723EB rev.B). The engineer confirmed that the maximum phase error due to asynchronous operation is one cycle of 4FSC (90 degrees at 3.579545 MHz), and variations due to temperature, process, and voltage are negligible. The user should focus on the accuracy of the external 4FSC oscillator (14.318180 MHz) for assessing the burst start point variation.
                        	    
    
                
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    Hello,
    
 
    I have questions about AD723.
    The start point of color burst from AD723 seems to move on AD723 Eval Board (AD723EB rev.B).
    Could you see attached file "Color_burst_AD723_rev01.xlsx" for more detail?
    
 
    Thank you!
    
 
    Best regards.
    Tamu
    
			
    
			
									
		                             
                        

    
    
                                            
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							Color_burst_AD723_rev01.xlsx
					        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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                on May 31, 2013 2:29 AM
            
            
						
			            		
        
		
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        Hello Jonathan,
        
 
        Thank you very much for your reply.
        
 
        This is last question for this issue.
        
 
        >so the greatest phase error would be one cycle of 4FSC, or 90 degrees at 3.579545 MHz.
        
 
        I think this is the greatest phase error Even if it is a case where temperature and process change.
        
 
        Is this right?
        
 
        Thank you!
        
 
        Best regards.
        
 
        Tamu
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on May 31, 2013 2:29 AM
            
            
						
			            		
          
		
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          Hello Jonathan,
          
 
          Thank you very much for your reply.
          
 
          This is last question for this issue.
          
 
          >so the greatest phase error would be one cycle of 4FSC, or 90 degrees at 3.579545 MHz.
          
 
          I think this is the greatest phase error Even if it is a case where temperature and process change.
          
 
          Is this right?
          
 
          Thank you!
          
 
          Best regards.
          
 
          Tamu
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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