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ADF4153A failure in power on-off test



		

			

									
						jhshin
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on May 9, 2016 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hello,

 
My customer is using ADF4153A as the following conditions:

 
    REF_IN: 10MHz / External_VCO: 608MHz / PFD_freq: 5MHz / CH spc.:500KHz

 
There is no problems in a normal state.

 
When the customer test the repeated power on-off, ADF4153A is occurred an irregular error that is locked about 4Mhz shift than the desired frequency.

 
  - The error is occurred regardless of the RF frequency.

 
  - If ADF4153A set a high RF frequency It is shifted more.

 
  - The error is cleared only when there is power-on reset of ADF4153

 
 

 
Please tell me the cause and solution of the error.

 
 

 
Thanks in advance.

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			


				
	









	
    
	

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                                 Analog Employees 
                                
                            
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                on May 9, 2016 2:48 PM
            
            
					
    
	
    

		
		
    
					
    Hello,
    
 
    Things to check are :
    
 
    In this fault condition...
    
 
    what is the Vtune voltage....? and the RFin signal ( frequency and voltage level) from the VCO ?
    
 
    How is the repeated power on/ off performed ....are any of the absolute max ratings violated?
    
 
    See attached our PLL_DEBUG documents to guide you/customer through the steps to localize the issue...
    
 
    note: even though the part looks ok in "normal state", It is still necessary to check the basics ( schematic, simulate loop filter in ADIsimPLL, check of all register writes ),
    
 
    regards,
    
 
    Brigid.
    
			
    

		
		
		
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