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How to Assign a Specific LO to TX and RX Channels in ADRV904x?

		
	
				

			

									
					    ACBarros
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Sep 10, 2026 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquired about how to assign LOs to specific TX and RX channels in the ADRV904x. The final answer indicated that the profile JSON file is used for this purpose, with parameters like 'txrx_channel_assign', 'use_LO1', 'rx_lo_frequency_in_kHz', and 'tx_lo_frequency_in_kHz' allowing detailed configuration of LOs for each channel. The user will request the necessary files as mentioned in the manual for further configuration.
                        	    

                
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Category: Datasheet/Specs

    		        		            		    
Product Number:  adrv904x 

    		        		    		    

		    		    
		    			

			    






Hi,




I am trying to understand how the LOs are assigned to the different TX and RX channels of the ADRV904x.






Which API attribute or parameter allows selecting the LO used by a specific TX or RX channel?




I am looking for the exact name of the structure, attribute, or function that controls the mapping between the available synthesizers and the transmit and receive signal chains.







			

			
									
		                             
                        

    

                                            
                 ADRV904x
                
                                                    
                 Datasheet/Specs
                
                                                    
                 lo
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Sep 10, 2026 2:44 PM
            
            
						
			            		
    
		
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    The profile JSON file provides the flexibility to configure distinct LO frequencies for individual Tx and Rx channels. Each profile supporting independent Tx and Rx LO configurations. Any of the four profiles can then be assigned to the required Tx/Rx channels.
    


    JSON parameters:
    

    

    txrx_channel_assign: Specifies the TRx channel assignment for each profile. Four instances of this parameter are available, corresponding to the four profile configurations. For example, "txrx_channel_assign": 102 assigns TRx1, TRx2, TRx5, and TRx6 to the selected profile.
    

    

    

    use_LO1: decides LO0 or LO1, Ex: "use_LO1": false, means LO0 is used for that profile and for that specific Tx or Rx channel. Four profiles --> Total eights instances 4*Tx and 4*Rx
    

    

    rx_lo_frequency_in_kHz: Required LO frequency in kHz, Ex: "rx_lo_frequency_in_kHz": 4700000, for 4.7GHz. Four instances for 4 Rx channels
    

    similarly tx_lo_frequency_in_kHz: For tx LO freq.
    

    JSON file constains four 
    

    Please refer to Configurable LO Options in Synthesizer Configuration section SDUG- UG2358  adrv9042-reference-manual-ug-2358.pdf for more details on configuring LOs for TRx.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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                on Sep 15, 2026 3:39 AM
            
            
												
						in reply to Vinod_Mekala
					
										
			            		
    
		
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    Thank you very much for the information.
    

    I understand that, in order to proceed, I need to request the files mentioned in the manual. I'll take care of that.
    

    Thanks again!
    

    

    

    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Sep 30, 2026 3:52 AM
            
            
												
						in reply to Vinod_Mekala
					
										
			            		
    
		
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    Hi,
    

    I am working with the ADRV904x on a ZCU102 and set up the system following this procedure:
    ADRV904x on a ZCU102
    

    I have not been able to locate the profile JSON file you mentioned. Could you please let me know where I can obtain it?
    

    Thank you!
    

    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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