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Products Mentioned

ADF5901 Recommended for New Designs
The ADF5901 is a 24 GHz Tx monolithic microwave integrated circuit (MMIC) with an on-chip, 24 GHz VCO with PGA and dual Tx channels for radar systems....
Datasheet
ADF5901 on Analog.com

ADF4159 Recommended for New Designs
The ADF4159 is a 13 GHz, fractional-N frequency synthesizer with modulation and both fast and slow waveform generation capability. The part uses a 25-bit...
Datasheet
ADF4159 on Analog.com

Associated Drivers

ADF5904 Recommended for New Designs
The ADF5904 is a 4-channel, 24 GHz, receiver downconverter. Each channel contains a single-ended RF input with an on-chip balun followed by a differential...
Datasheet
ADF5904 on Analog.com

Thread Details

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Synchronizing multiple ADF5901 chips

		
	
				

			

									
					    eschlomann
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 3, 2020 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquired about increasing the number of TX and RX channels in an EV-RADAR-MMIC2-like system using ADF4159, ADF5901, and ADF5904. The final answer confirmed that multiple ADF5904 RX chips can be synchronized by sharing the LO line from the ADF5901, but synchronizing multiple ADF5901 TX chips is not supported due to inconsistencies from separate VCOs.
                        	    

                
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Hello,




I am working on developing a system much like the EV-RADAR-MMIC2 development platform utilizing the ADF4159, ADF5901, and ADF5904. I was hoping to increase the number of TX and RX channels and create an N channel TX, N*2 channel RX system.


Is there a way that the 5901 chips can be synchronized? Would sharing the input reference signal and VTUNE between devices be sufficient? In this configuration I would use one of the 5901 chips as the feedback path for the ADF4159 as well as for the LO reference for all of the 5904 rx chips.


Let me know if you have any thoughts about this issue. Have you attempted this before?




Thanks,


Evan

			

			
									
		                             
                        

    

                                            
                 Microwave and mmWave Tx/Rx
                
                                                    
                 Microwave and mmWave Transmitters
                
                                                    
                 synchronize
                
                                                    
                 RF Integrated Transmitters
                
                                                    
                 rf & microwave
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
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    •  Analog Employees  
    •  Super User  
    
            
						
                            
            
            				
            
                on Jun 8, 2020 9:44 AM
            
            
						
			            		
    
		
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    Hi Evan,
    

    For the Rx channels it is possible to synchronize multiple ADF5904 chips as you have said by splitting the LO line from the ADF5901.
    

    Unfortunately for the Tx this is not straightforward and thus we do not support it. If two chips were to share the same reference etc. they still would not be synchronized due to inconsistencies introduced by things like using multiple separate VCOs.
    

    

    Regards,
    

    Alex
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
				
				
				
		
		
    
			
		
    
	
    

    

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