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ADM4168E RS-422 Transceiver Input Range



		

			

									
						PBArrow
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Oct 28, 2020 
				
			
			
		


				
		

		    		    
		    
		    	
			
I have a question regarding the input common-mode range of the ADM4168E. The datasheet says the input can swing +/-7V. However the IC is powered by a single 5V supply. Looking at the Rin spec, the condition specifies one input is at 0V, the other can swing +/-7V. So my question is, can the IC really operate with one of the Rx inputs at +/-7V? If so, is there some kind of a resistive divider and/or clamp that allows this to occur? Thanks in advance.

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	










	

	

					



			








	
	
	
	



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                                 Analog Employees 
                                
                            
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                on Oct 28, 2020 8:18 PM
            
            
					
    
	
    

		
		
    
					
    Hello ,
    

    Yes the ADM4168E is designed to operate under these conditions despite being powered from a 5V power supply.
    

    The receiver inputs of the ADM4168 contains high impedance passive circuitry, which can be approximated as a resistive divider + level shifter, that allows the receiver to operate across the full +7V to -7V input voltage range. The receiver inputs also have ESD clamping diodes which will turn on if the -14V to +14V absolute maximum rating of the A or B pins is exceeded.
    

    The setup conditions for the Rin specification in the datasheet are taken from the TIA/EIA-422 standard, which specifies that the input current and resistance should be measured with one pin at +7V / -7V and the other pin grounded. 
    

    Regards,
    

    Neil 
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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