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HMC4069 Production
The HMC4069LP4E is an Integer-N synthesizer which incorporates a 10 to 1300MHz digital phase-frequency detector with a 10 to 2900MHz 5-bit frequency counter...
Datasheet
HMC4069 on Analog.com

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HMC4069 Lock Detect



		

			

									
					    Mike556
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 13, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  HMC4069 
    
    		        		    		    	
			
    With the HMC4069 PLL IC, would there be any problem pulling the lock detect pin up to 3.3V, instead of the 5V supply, to make it compatible with 3.3V logic?  (The IC would still be powered from 5V.)
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 hardware
                
                                                    
                 Integer-N PLL
                
                                                    
                 hmc4069
                
                                                    
                 Phase Locked Loop (PLL) Synthesizer & Translation Loop
                
                                                    
                 rf and microwave
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 21, 2023 8:47 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      

      sorry for the delay in getting back to you. 
      

      I believe I responded to you through the FAE, but I write the response anyway here:
      

      I looked at the data sheet and that LD pin is an output, so if the pull up is at 5V or 3.3V depends on what you want to put as a receiver on that pin. If you put an LED, then the current that LED needs will determine the pull up voltage and the resistor value
      

      Petre
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 21, 2023 8:47 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      

      sorry for the delay in getting back to you. 
      

      I believe I responded to you through the FAE, but I write the response anyway here:
      

      I looked at the data sheet and that LD pin is an output, so if the pull up is at 5V or 3.3V depends on what you want to put as a receiver on that pin. If you put an LED, then the current that LED needs will determine the pull up voltage and the resistor value
      

      Petre
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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