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HMC386 Recommended for New Designs
The HMC386LP4(E) is a GaAs InGaP Heterojunction Bipolar Transistor (HBT) MMIC VCO with integrated resonator, negative resistance device, varactor diode...
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HMC386 on Analog.com

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hmc386 stops sweep frequency



		

			

									
					    TBcracker
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 10, 2017 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello guys, the HMC386LP4E on my PCB frequently broken down: it stops sweep the frequency, stays at a single frequency point, however the controlling voltage is right.
    
 
       i thought it might because of the power, but my power supply is 3.3V from a LDO AMS1117-3.3, the datasheet claims the absolute maximum voltage can be 3.5V, since the LDO is pretty smooth, so i am really confused about the reason it stops working normally.
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Voltage Controlled Oscillators (VCO)
                
                                                    
                 hmc386
                
                                                    
                 VCOs with Single Output
                
                                                    
                 vco
                
                                                    
                 sweep frequency
                
                                        
                                            
                
                
                                
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on May 3, 2017 12:54 PM
            
            
					
      
	
      

		
		
      
					
      Hi there, 
      
 
      I apologize for the delay in getting back to you.
      
 
      If the device is mounted to "your" board as opposed to the evaluation board a number of things could be the problem.
      
 
      1) Is it drawing the nominal current (35-40mA depending on Vcc)?
      
 
      2) If so, were ESD precautions observed?  These are Class 0 parts so it's easy to damage them during handling / solder attach.
      
 
      3) Perhaps it's assembly related (solder joint) - might try reflowing the device using the least amount of heat possible for the solder alloy used.
      
 
      4) If all seems o.k. - replace part with a new device.
      
 
      Best Regards,
      
 
      Marty
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on May 3, 2017 12:54 PM
            
            
					
      
	
      

		
		
      
					
      Hi there, 
      
 
      I apologize for the delay in getting back to you.
      
 
      If the device is mounted to "your" board as opposed to the evaluation board a number of things could be the problem.
      
 
      1) Is it drawing the nominal current (35-40mA depending on Vcc)?
      
 
      2) If so, were ESD precautions observed?  These are Class 0 parts so it's easy to damage them during handling / solder attach.
      
 
      3) Perhaps it's assembly related (solder joint) - might try reflowing the device using the least amount of heat possible for the solder alloy used.
      
 
      4) If all seems o.k. - replace part with a new device.
      
 
      Best Regards,
      
 
      Marty
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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