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ADV7125 Production
The ADV7125 (ADV®) is a triple high speed, digital-to-analog converter (DAC) on a single monolithic chip. It consists of three high speed, 8-bit video...
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ADV7125 on Analog.com

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Hsync and Vsync synchronizations

		
	
				

			

									
					    ADV7125
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 12, 2024 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  ADV7125  
    
    		        		    		    
    
		    		    
		    			
    
			    
    

    Hi,
    

    With continuation of previous question modifications.
    

    we have added D  flip-flops for 1 cycle delay purpose so that, the RGB and Hsync and Vsync signals will synchronize. as shown in the figure.
    

     
    

    so the questions is, can the proper synchronization will happen if we use D flip-flop for Hsync and Vsync signals.
    

    second thing, the DRDY signal is use for data enable only so is it right to connect it to BLANK signal.
    

     
    

    Regards,
    

    Sanjay
    

    
			
    
			
									
		                                 
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                 Standard High Speed D/A Converters
                
                                                    
                 hardware
                
                                                    
                 High Speed D/A Converters =30MSPS
                
                                                    
                 adv7125
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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                on Mar 18, 2024 8:41 AM
            
            
						
			            		
        
		
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        Hi,
        

        If you desire to provide SYNC separately from reference signal, placing a flip-flop retimer circuit to align SYNC signals to reference signals to avoid setup and hold time violations is recommended. Placing D-Flipflop can synchronize RGB with sync signals.
        

        

        Video Blanking signals are the inverse of Data Enable (DE) signals. Hence, we shouldn't connect blanking and data enable.
        

         
        

        

        Thanks,
        Dharani S
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Mar 19, 2024 12:58 AM
            
            
												
						in reply to DharaniS
					
										
			            		
          
		
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          Hi,
          

          As far as data enable and Blank signal connection is concern, we are inverting the data enable signal using digital inverter and then giving it to blank signal of IC ADV7125.
          

          So in this way will it work.
          

          

          Regards,
          

          Sanju
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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                on Mar 21, 2024 1:02 AM
            
            
												
						in reply to ADV7125
					
										
			            		
            
		
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            Hi,
            

            

            If you invert the Data Enable (DE) signal using a digital inverter, it means that the DE signal will transition between high and low states oppositely to its original state. Inverting the DE signal can have various purposes in display systems. Make sure to verify the timing and polarity requirements of your display system to ensure proper operation after inverting the DE signal.
            

            

            

            The ADV7125 only outputs what is on the input. It does not change any of the timing.
            

            Please check the clock, sync and blank signals with a scope to make sure they match the requirements of the display. Tweak the timing parameters as needed in your code or source. Then check a color bar source to make sure the colors are going through correctly.
            

            

             
            

            

            Thanks,
            

            Dharani S
            
			
            

		
			
	      

		
		
	
            
	
            
		
            
			
		
            
	
            
	
            
		
						
						
						
						
				
				
		
		
            
			
		
            
	
            

            

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