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How many AD9082s can be synchronized with a single LTC6953 Clock Buffer?

		
	
				

			

									
					    sanazaim
					
							

            
            			
				
									
											
			
			
				
  •  Analog Employees  

			
			
			    	
			                    
                
				                on Feb 14, 2024 
				
			
			
		

		
		                    	    

        	    
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                The user asked how many AD9082s can be synchronized with a single LTC6953 Clock Buffer. The final answer indicates that in the current design, 2 AD9082s are synced per LTC6953, but up to 4 or 5 AD9082s could be supported if only SYSREF and clock signals are considered, utilizing the 11 available outputs. The LTC6953 is used to send reference clocks to ADF4371s and the FPGA, and SYSREF signals to the AD9082s and FPGA.
                        	    

                
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How many AD9082s can be synchronized with a single LTC6953 Clock Buffer?

			

			
									    

			        
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    				How many AD9082s can be synchronized with a single LTC6953 Clock Buffer?

[edited by: sanazaim at 12:55 PM (GMT -5) on 14 Feb 2024]
				

						
		                             
                        

    

                                            
                 ltc6953
                
                                                    
                 Clock Generation and Distribution
                
                                                    
                 hardware
                
                                                    
                 Clock Distribution Devices
                
                                                    
                 Clocks & Timers
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Feb 14, 2024 7:56 AM
            
            
						
			            		
    
		
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In the current design, we are syncing 2 AD9082’s per LTC6953. This is because we are leveraging the LTC6953 to send reference clocks to the ADF4371S feeding the RX LO conditioning circuit, the ADF4371S feeding the TX LO conditioning circuit, the two ADF4371S’s feeding both AD9082’s, and a reference clock to the FPGA. We are also sending SYSREF signals to the FPGA and both AD9082’s. Depending on your FPGA, you may also require external JTX and JRX core clocks- we are showing both of those generated by the LTC6953 for a total of 10 out of the 11 available outputs. Each subsequent LTC6953 won’t need to provide JTX or JRX core clocks, or FPGA reference clocks which will free extra outputs on the LTC6953. Shown below is a simplified block diagram excluding JTX and JRX core clock signals. 
     
     Beyond the scope of this reference design, let’s consider how many AD9082s we can sync with a single LTC6953: If there are 11 buffered outputs, and each AD9082 requires both a SYSREF signal and clock signal, then each LTC6953 could support 4 or even up to 5 AD9082’s.
     
     For more information relating to the LTC6953, here is the link to the product’s landing page: LTC6953 Datasheet and Product Info | Analog Devices
     
     
     Check out our main wiki page for more information: wiki.analog.com/.../space-based-satcom-ref-design
         		

    
    

    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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