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The ADV7403 is a high quality, single chip, multiformat video decoder and graphics digitizer. This multiformat decoder supports the conversion of PAL,...
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ADV7403 on Analog.com

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ADV7403BSTZ-110 RS-170 Video Detection Issue

		
	
				

			

									
					    NileshCore
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Apr 16, 2026 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Hardware

    		        		            		    
Product Number:  ADV7403BSTZ-110 

    		        		    		    

		    		    
		    			

			    
I am currently using the ADV7403BSTZ-110 in a design where I am feeding a monochrome RS-170 video signal (640*480). However, the IC is detecting this as an NTSC signal (720*480), which results in a black border and incorrect framing on the output.


Since the ADV7403 datasheet does not explicitly list RS-170 support, I have the following questions


    

  1. Is there a specific register configuration or script for the ADV7403 that allows it to correctly frame a RS-170 input without defaulting to 720-pixel NTSC width?
    2. 

  2. If the ADV7403 cannot support this, could you recommend a similar video decoder IC (with similar pinouts or specifications) that fully supports NTSC, PAL, and monochrome RS-170?
    3. 



I have attached my current schematic ( i am giving RS170 input to the pin no 76 of IC ) and a sample of the video output for your reference. Any guidance or scripts you can provide would be greatly appreciated.


 




 

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    •  Super User  
    
            
						
                            
            
            				
            
                on May 26, 2026 5:40 AM
            
            
						
			            		
    
		
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    Hi,
    

    For the encoder parts (DAC), We will inform the customer to set 'SD Burst' and 'SD Chroma' = 1 to disable the color burst. However, these registers are not available in the decoder part, which is why I suggested using the Color kill register.
    

    Kindly note that the output timings will typically appear as NTSC timings since it is NTSC without color, so the decoder treats it very similarly to NTSC timings.
    

    

    Thanks,
    

    Poornima S
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    •  Super User  
    
            
						
                            
            
            				
            
                on May 26, 2026 5:40 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi,
    

    For the encoder parts (DAC), We will inform the customer to set 'SD Burst' and 'SD Chroma' = 1 to disable the color burst. However, these registers are not available in the decoder part, which is why I suggested using the Color kill register.
    

    Kindly note that the output timings will typically appear as NTSC timings since it is NTSC without color, so the decoder treats it very similarly to NTSC timings.
    

    

    Thanks,
    

    Poornima S
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

    • 





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