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ADF7021-N Not Recommended for New Designs
The ADF7021-N is a high performance, low power, narrow-band transceiver based on the ADF7021. The ADF7021-N has IF filter bandwidths of 9 kHz, 13.5 kHz...
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ADF7021-N on Analog.com

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Ask about VCO of ADF7021-N



		

			

									
					    韩先生
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 2, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    How to set the external VCO of ADF7021-N? Set the receiving frequency of 7021 to 149.85MHZ. The transmitting frequency is 401.95 MHZ. What is the frequency of VCO? Thank you
    
									
			        
		
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Apr 16, 2019 9:41 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      For 149.82MHz, use L3 of 14nH to 17nH, with the following register settings,
      

      R1_DB25 = 1 (this sets the VCO to external VCO)
      

      R1_DB18 = 1
      

      R1_DB[23:24] = XX
      

      R1_DB[19:22] = 2
      

      For 401.9MHz, use L3 of 6nH to 8nH, with the following register settings,
      

      R1_DB25 = 1 (this sets the VCO to external VCO)
      

      R1_DB18 = 0
      

      R1_DB[23:24] = XX
      

      R1_DB[19:22] = 3
      

      For your last question, do you mean frequency of VCO without dividing by 2?
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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