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AD9523-1 Recommended for New Designs
The AD9523-1 provides a low power, multi-output, clock distribution function with low jitter performance, along with an on-chip PLL and VCO with two VCO...
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AD9523-1 on Analog.com

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AD9523-1  Can I precisely adjust output clock frequency with AD9523-1 (EVAL-AD9523-1)?



		

			

									
					    dmitrit
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 24, 2017 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Greetings!
    
 
    I would like to inquire if it is possible to achieve precise frequency control with EVALZ - AD9531-1? I'm interested in generating a clock signal that is a multiple of femtosecond laser output pulse rate, which can be something close to 80 MHz, ex. 80.001000MHz. So the frequencies I need would be 160.002000, etc. Initially I thought that precise adjustments can be possible with input frequency, for example, from another DDS board.
    
 
    I received this board recently and as soon as I started using it I saw that it becomes immune to input frequency change after I write the default setup file in. Is it possible to change this behavior?
    
 
    Also, may be you can recommend another device that can do the job, if this one is not suitable?
    
 
    Thank you so much!
    
 
    Dmitri
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Clock Generation Devices
                
                                                    
                 Clock Generation and Distribution
                
                                                    
                 eval-ad9523-1
                
                                                    
                 frequency adjustment
                
                                                    
                 clock and timing
                
                                        
                                            
                
                
                                
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jun 26, 2017 1:53 PM
            
            
					
      
	
      

		
		
      
					
      Hello Dmitri,
      
 
      The AD9523-1 will respond to input frequency changes and remain locked, but only over a very limited range (perhaps +/- 50 ppm). The exact range will depend on the pulling range of the VCXO and to a lesser extent, the VCO2 frequency range.
      
 
      80.001 MHz is about 12.5 ppm, and that should be ok.
      
 
      The first thing I would do is ensure that both PLLs on the AD9523-1 are locked, and then very slowly move the input frequency after locking the AD9523-1 and see how far you can go.
      
 
      If you want a PLL with larger tuning range, I recommend the AD9528 and AD9520 family. However, even with the AD9528, you will need a VCXO with higher KVCO than the Vectron CVHD-950 that is on there.
      
 
      Another good option is the AD9557, which is a fractional N PLL that can also act as a low jitter frequency synthesizer.
      
 
      -Paul Ker
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jun 26, 2017 1:53 PM
            
            
					
      
	
      

		
		
      
					
      Hello Dmitri,
      
 
      The AD9523-1 will respond to input frequency changes and remain locked, but only over a very limited range (perhaps +/- 50 ppm). The exact range will depend on the pulling range of the VCXO and to a lesser extent, the VCO2 frequency range.
      
 
      80.001 MHz is about 12.5 ppm, and that should be ok.
      
 
      The first thing I would do is ensure that both PLLs on the AD9523-1 are locked, and then very slowly move the input frequency after locking the AD9523-1 and see how far you can go.
      
 
      If you want a PLL with larger tuning range, I recommend the AD9528 and AD9520 family. However, even with the AD9528, you will need a VCXO with higher KVCO than the Vectron CVHD-950 that is on there.
      
 
      Another good option is the AD9557, which is a fractional N PLL that can also act as a low jitter frequency synthesizer.
      
 
      -Paul Ker
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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