Products Mentioned

ADV7123 Production
The ADV7123 (ADV®) is a triple high speed, digital-to-analog converter on a single monolithic chip. It consists of three high speed, 10-bit, video DACs...
Datasheet
ADV7123 on Analog.com

ADV7182 Not Recommended for New Designs
The ADV7182 automatically detects and converts standard analog baseband video signals compatible with worldwide NTSC, PAL, and SECAM standards into a 4...
Datasheet
ADV7182 on Analog.com

ADV7393 Not Recommended for New Designs
The ADV7390 / ADV7391 / ADV7392 / ADV7393 are a family of high speed, digital-to-analog video encoders on single monolithic chips. Three 2.7 V/3.3 V, 10...
Datasheet
ADV7393 on Analog.com

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ADV7123 loopback with ADV7182



		

			

									
					    shekhar_kulkarni
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 22, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    

    

    We have a scenario mentioned below
    

      

    • ADV7393 loopback to ADV7182 with Monochrome PAL video

        

      • ADV7182 status register reads

          

        • 0x10: 0x48 and 0x13: 0x4C [Interlaced and 50Hz]
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    • ADV7123 loopback to ADV7182 with Monochrome PAL video

        

      • ADV7182 status register reads

          

        • 0x10: 0xC9 and 0x13: 0x0D [50Hz], Interlaced not detected
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    HYSNC and VSYNC of ADV7393 are ANDed together and used as Composite Sync to ADV7123, whereas BLANK of ADV7123 is Data Enable kind of signal
    

    

    Please let us now why Interlaced is not being detected during ADV7123 loopback
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Video Products
                
                                                    
                 Standard High Speed D/A Converters
                
                                                    
                 adv7393
                
                                                    
                 Video Encoders
                
                                                    
                 High Speed D/A Converters =30MSPS
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Apr 22, 2021 6:17 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      When referring the ADV7123 datasheet at Page17, It can support 60 Hz for a noninterlaced system, or 30 Hz for an interlaced system.
      

      Could you please try with 30Hz frame rate for interlaced input and let us know the result.
      

      Please note that ADV7123 is just a triple DAC with blanking added based on the control pins.  You control all timing so it can implement almost any analog format including the sync signals.  Interlaced formats is set by the input sync timing.
      

      

      Thanks,
      

      Poornima
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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