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AD9219 Clock Sources



		

			

									
						lukeabela38
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Dec 17, 2019 
				
			
			
		


				
		

		    		    
		    
		    	
			
Good day,




I am currently developing a board based on the AD9219, and am seeking to design a clock input. Could the clock be provided by a low jitter analogue sine wave? or must be the clock be digital?


Regards,


Luke

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	














	

	

					



			








	
	
	
	



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                                 Analog Employees 
                                
                            
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                on Dec 17, 2019 3:32 PM
            
            
					
    
	
    

		
		
    
					
    Hi, 
    

    We often use a sine source to clock our high-speed ADCs.  You will see a description of that recommendation on page 37, and on page 41 there is a schematic of how we use a transformer and some Schottky diodes to transform to a differential signal and clip the sine source.   This preserves the high slew rate portion of the sine input without overdriving the clock input, thereby providing a low jitter clock to the ADC.  
    

    Good luck with your design, 
    

    David
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on Dec 17, 2019 3:32 PM
            
            
					
    
	
    

		
		
    
					
    Hi, 
    

    We often use a sine source to clock our high-speed ADCs.  You will see a description of that recommendation on page 37, and on page 41 there is a schematic of how we use a transformer and some Schottky diodes to transform to a differential signal and clip the sine source.   This preserves the high slew rate portion of the sine input without overdriving the clock input, thereby providing a low jitter clock to the ADC.  
    

    Good luck with your design, 
    

    David
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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