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AD9522 and ADISIMCLK not configuring 800MHz Output



		

			

									
						adiup
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 20, 2016 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I am thinking of using the AD9522-0 in a new design. I am playing with ADISIMCLK (version 1.70.04) but I cannot seem to configure it to get a 800MHz output. Is there a bug in the tool that stops me from selecting divide by 1 as the VCO divider?
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

					
    
			
    


    

	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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                on Dec 20, 2016 8:57 PM
            
            
					
      
	
      

		
		
      
					
      Hi adiup,
      
 
      The AD9522-0 has an internal VCO frequency range of 2.53GHz - 2.95GHz. That frequency range does not support an integer divide to create 800MHz at the output. The tool is not letting you set the VCO divider by 1 because of the internal VCO frequency exceeding the maximum frequency into the channel dividers, which is 1.6GHz.
      
 
      AD9522-1 supports a VCO frequency range of 2.27GHz - 2.65GHz. That may be a better option. The VCO frequency can be set to 2.4GHz and the VCO divider set to 3 to produce 800MHz.
      
 
      Hopefully this is helpful in selecting the appropriate clock generator for your application.
      
 
      Regards,
      
 
      -Steve
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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