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HMC835 Last Time Buy
The HMC835LP6GE is a low noise, wide band, Fractional-N PLL that features an integrated VCO with a fundamental frequency of 2020 to 4100 MHz, and an integrated...
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HMC835 on Analog.com

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HMC835 Manual calibration



		

			

									
					    fschader
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 30, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I have an HMC835 working quite well in my system.  I want to speed up the tuning by using manual calibration.  I am able to successfully read back any/all registers but after tuning to a new frequency (integer mode) when I read back register 0x15 I always get the factory default instead of the currently tuned frequency data.
    

    Is there some other register setting that causes the auto-calibrated data to appear in register 0x15, or is there some special sequence that causes this
    

    

    thanks
    

    Fred
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 hmc835
                
                                                    
                 Fractional-N PLL
                
                                                    
                 Phase Locked Loop (PLL) Synthesizer & Translation Loop
                
                                                    
                 rf and microwave
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 19, 2021 5:31 AM
            
            
					
      
	
      

		
		
      
					
      Hi Fred,
      

      The readback and write registers are different for manual calibration. Register 0x15 is used only to write the VCO parameters. The auto-calibrated data can be read from register 0x10. The VCO core and capacitor is not separated in register 0x10. You can consider as 0x10[4:0] as VCO capacitor and 0x10[7:5] as VCO core selection. In other words write the readback value 0x10[7:0] directly to register 0x15[8:1].
      

      Regards,
      

      Kazim
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 19, 2021 5:31 AM
            
            
					
      
	
      

		
		
      
					
      Hi Fred,
      

      The readback and write registers are different for manual calibration. Register 0x15 is used only to write the VCO parameters. The auto-calibrated data can be read from register 0x10. The VCO core and capacitor is not separated in register 0x10. You can consider as 0x10[4:0] as VCO capacitor and 0x10[7:5] as VCO core selection. In other words write the readback value 0x10[7:0] directly to register 0x15[8:1].
      

      Regards,
      

      Kazim
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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