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ADV3202 Production
The ADV3202/ADV3203 are 32 × 16 analog crosspoint switch matrices. They feature a selectable sync-tip clamp input for ac-coupled applications and a 2:1...
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ADV3202 on Analog.com

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ADV3202 - cropped video signals



		

			

									
					    DHFTL
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 7, 2015 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello everybody,
    
 
     
    
 
    I have a problem using the ADV3202. All output video signals are cropped at about 900 mV in a manner, that no sync is transmitted. VPOS is connected to +5 V, VNEG is connected to GND, VREF is supplied with 2.5 V and VCLAMP is connected to GND as well. (I tried several connections for VCLAMP and VREF, but neither worked)
    
 
     
    
 
    Attached I have a snippet of the schematic and a sample of input and output video signal.
    
 
     
    
 
    Can you please give me a hint to solve this problem? Thanks in advance.
    
									
			        
		
    

				
							0003_VOUT_ERROR.zip
							
        

    
    Tags: 
                                            
                 adv3202
                
                                                    
                 switches and multiplexers
                
                                                    
                 Buffered Analog Crosspoint Switches
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 13, 2015 8:05 PM
            
            
					
      
	
      

		
		
      
					
      Hi, Daniel.
      
 
      Can you please measure the voltage in the VREF pin? From your circuit, this is 5V (contradicting your signal name of VA2P5) thus exceeds the absolute maximum VREF input voltage range of VPOS - 3.5V to VNEG + 3.5V.
      
 
      If your measurement is really 5V, please remove the EMI filter bead and see if this removes the clamping.
      
 
      Regards,
      
 
      Anna
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 13, 2015 8:05 PM
            
            
					
      
	
      

		
		
      
					
      Hi, Daniel.
      
 
      Can you please measure the voltage in the VREF pin? From your circuit, this is 5V (contradicting your signal name of VA2P5) thus exceeds the absolute maximum VREF input voltage range of VPOS - 3.5V to VNEG + 3.5V.
      
 
      If your measurement is really 5V, please remove the EMI filter bead and see if this removes the clamping.
      
 
      Regards,
      
 
      Anna
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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