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ADF5902 Recommended for New Designs
The ADF5902 is a 24 GHz transmitter (Tx) monolithic microwave integrated circuit (MMIC) with an on-chip, 24 GHz voltage controlled oscillator (VCO). The...
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ADF5902 on Analog.com

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ADF5902 can not output singal

		
	
				

			

									
					    刘国龙
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 5, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  ADF5902  
    
    		        		    		    
    
		    		    
		    			
    
			    
    The register configuration sequence in the period manual was configured and no output was found. Measuring the Vtune can see the waveform of the sawtooth.And I modify the value of register 5，tune oFF ramp，measuring the Vtune can see a fixed voltage,and it sitll cant output a fixed signal. why?
    

    In the datasheet I found this"When programming the registers for a ramp, write the registersin descending order. Then write to Register R5 to enable theramp (Register R5, Bit DB29 = 1) must be last." but in the"Table 7. Initialization Sequence" the register 11 is the last one .so what is the correct  register configuration sequence?
    
			
    
			
									
		                             
                        

    
    
                                            
                 Microwave and mmWave Tx/Rx
                
                                                    
                 adf5902
                
                                                    
                 hardware
                
                                                    
                 RF Integrated Transceivers
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Mar 13, 2025 8:50 AM
            
            
						
			            		
      
		
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      Hi, 
      

      You are right. Some of the registers are double buffered and requires R0 write to take effect. Therefore, R0 must be written after some of the registers.
      

      I recommend writing the R0 after following the initialization sequence. 
      

      TX AMP CAL CODE should be determined by the calibration sequence. 
      

      If you are observing -40dBm, I recommend checking the termination and layout. Is there an AC Coupling capacitor to measurement device. 
      

      Thanks,
      

      Emrecan
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
				
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Mar 13, 2025 8:50 AM
            
            
						
			            		
      
		
										+1
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi, 
      

      You are right. Some of the registers are double buffered and requires R0 write to take effect. Therefore, R0 must be written after some of the registers.
      

      I recommend writing the R0 after following the initialization sequence. 
      

      TX AMP CAL CODE should be determined by the calibration sequence. 
      

      If you are observing -40dBm, I recommend checking the termination and layout. Is there an AC Coupling capacitor to measurement device. 
      

      Thanks,
      

      Emrecan
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
				
				
				
		
		
      
			
		
      
	
      

      

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