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ADV7441A Not Recommended for New Designs
The ADV7441A is a high quality multiformat video decoder and graphics digitizer with an integrated 2:1 multiplexed HDMI™ receiver. The ADV7441A contains...
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ADV7441A on Analog.com

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ADV7441A Power Supply architecture



		

			

									
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  •  Analog Employees  

			
			
			    	
			                    
                
				                on Apr 13, 2010 
				
			
			
		


				
		

		    		    
		    
		    	
			
 The ADV7441A has 6 power domains: 4 @ 1.8V and 2 @ 3.3V. The ADV7441A Video Input Module design uses a separate LDO for each domain, with an EMC filter included on each. Customers would like to combine supplies where possible to reduce cost,... Please provide some guidance on what supplies can be combined, the need for the EMC filters and other strict design rules that should be followed for the power supplies.

									
			        
		


				
				
		

			
						
									
									
						
						
			
			
			
			
		


        
        

					

			






	

		
	

















	

	

					



			








	
	
	
	



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    •  Analog Employees  
    
            
			                            
                        
                on Apr 21, 2010 7:13 PM
            
            
					
    
	
    

		
		
    
					
    I can tell you that I used a single 1.8V supply and single 3.3V supply and isolated each power domain from the primary voltage with an EMC filter.  It worked but I wasn't pushing the part very hard.  The recommendations in the data sheet and hardware manual are what they are... design to save cost is never without compromise.
    
 
    The PLL supply might warrant it's own... something like the ADP120 is pretty cheap and simple. We did have issues with our audio PLL locking and I think it was power supply related.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
			                            
                        
                on Apr 21, 2010 7:13 PM
            
            
					
    
	
    

		
		
    
					
    I can tell you that I used a single 1.8V supply and single 3.3V supply and isolated each power domain from the primary voltage with an EMC filter.  It worked but I wasn't pushing the part very hard.  The recommendations in the data sheet and hardware manual are what they are... design to save cost is never without compromise.
    
 
    The PLL supply might warrant it's own... something like the ADP120 is pretty cheap and simple. We did have issues with our audio PLL locking and I think it was power supply related.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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