Products Mentioned

ADV7391 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
ADV7391 on Analog.com

  • State Verified Answer
  • Replies 2 replies
  • Subscribers 80 subscribers
  • Views 945 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
		
	
	
		

		
ADV7391 Power Supplies



		

			

									
					    joerg
					
							

			
				
									
											
			
			
				
  •  Analog Employees  

			
			
			    	
			                    
                
				                on Nov 12, 2012 
				
			
			
		


				
		

		    		    
		    
		    	
			
ADV7391 datasheet, please take a look at page 72/108 and tell me what does 
AGND, PGND, DGND and GND_IO means? Should I use four different power supplies? 
How should I connect these four grounds together and where. The information on 
the datasheets is misleading. 

									
			        
		


				
						
        

    
Tags: 
                                            
                 Video Products
                
                                                    
                 adv7391
                
                                                    
                 Video Encoders
                
                                
            

    
    

		

			
						
									
									
						
						
			
			
			
			
		


        
        

					

			





















	

	

					



			








	
	
	
	



Parents
	
    
	

  • 
	
    



	
		
	
	



    
	
    
		
    
							FormerMember
					
    
		
    
			
													0
							
			
				
									FormerMember
							        
			
			
			

            
						
                            
            
            				
            
                on Nov 12, 2012 4:17 PM
            
            
					

	


		
		

					
The 4 different ground types are related to internal sections of the chip.  Normally we tie all the grounds together on a single plane.  Check out the reference layout.

 
Vdd_io and Vaa are nominally 3.3V rails while Vdd and PVdd are 1.8V rails.  These sources can be generated by 2 different regulators.  Figure 94 has ferrite beads separating the various power pins to isolate AC coupling between the internal sections of the chip.  You can use 4 LDOs or regulators but 2 will suffice as long as you have the ferrite isolation.

			


		
			
	      

		
		
	

	

		

			
		

	

	

		
						
						
				
						
				
				
		
		

			
		

	





	



Reply

    


  • 
	
    



	
		
	
	



    
	
    
		
    
							FormerMember
					
    
		
    
			
													0
							
			
				
									FormerMember
							        
			
			
			

            
						
                            
            
            				
            
                on Nov 12, 2012 4:17 PM
            
            
					

	


		
		

					
The 4 different ground types are related to internal sections of the chip.  Normally we tie all the grounds together on a single plane.  Check out the reference layout.

 
Vdd_io and Vaa are nominally 3.3V rails while Vdd and PVdd are 1.8V rails.  These sources can be generated by 2 different regulators.  Figure 94 has ferrite beads separating the various power pins to isolate AC coupling between the internal sections of the chip.  You can use 4 LDOs or regulators but 2 will suffice as long as you have the ferrite isolation.

			


		
			
	      

		
		
	

	

		

			
		

	

	

		
						
						
				
						
				
				
		
		

			
		

	








Children
	
No Data