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ADM3075E Production
The ADM307xE are 3.3 V, low power data transceivers with ±15 kV ESD protection suitable for full- and half-duplex communication on multipoint bus transmission...
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ADM3075E on Analog.com

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Receiver Behavior when Driver Enable is Pulled High

		            
		

			

									
					    Tojan
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 24, 2025 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    		      		            		        
    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  ADM3075E  
    
    		        		    		    	
			
    Hello,
    

    The ADM3075E datasheet describes the transmitting behavior when the Driver Enable (DE) input is pulled high and the receiving behavior when both DE and not Receiver Enable (nRE) are low. However I miss any statement on what happens on receiver side when the DE signal is high and the nRE is low, technically enabling both the transmitter and the receiver at the same time. Would the chip then technically act in loop back mode or does the receiver gets automatically deactivated as soon as DE is pulled high as maybe hinted at by the transmitter state table?
    

    Thanks and Best Regards,
    

    Tojan
    
										

    
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[edited by: Tojan at 3:21 PM (GMT -4) on 24 Apr 2025]
				
    
						
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Datasheet/Specs
                
                                                    
                 RS-232 / RS-422 / RS-485 / RS-562
                
                                                    
                 adm3075e
                
                                                    
                 RS-485 and RS-422
                
                                
            
    
    
    

		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 24, 2025 4:14 PM
            
                                    
					
      
	
      

		
		
      
					
      Hi Tojan,
      

      Thank you for your question. Both transmitter and receiver will be on when DE = 1 and /RE\= 0. You are right the receiver echoes the transmitter signal when DE =1 and /RE\= 0. It is typical to list the transmitter and receiver truth tables separately since they work independently. “X” (don’t care) is used for either “1” or “0” to simplify combinations in a truth table. Both Tabel 8 and Table 9 cover the combination DE = 1 and /RE\ =0.
      

      Best,
      

      Jane
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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