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ADG3123 Production
The ADG3123 is an 8-channel, noninverting CMOS to high voltage level translator. Fabricated on an enhanced LC2MOS process, the device is capable of operating...
Datasheet
ADG3123 on Analog.com

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ADG3123 analog voltage range



		

			

									
					    strocchia1
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 21, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    To whom it may concern, 
    

    I am intrigued by the ADG3123 because it affords logic-level to high-voltage bipolar outputs. However, I do not necessarily need the high voltage range specified in the part datasheet. Can this part operate at VDDA=VDDB=3V or VDDA=VDDB=5V and VSS=0V levels? This is a typical use case for my application. 
    

    While the datasheet describes the min recommended VDDB to GND and VDDB to VSS is 10.8V, I believe my above biasing conditions do not violate the absolute max ratings (i.e. VDDA <= VDDB, as well as what is shown in the screen capture below).
    

     
    

    Please advise.
    

    Thank you kindly,
    

    Scott 
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 adg3123
                
                                                    
                 Data Path Management
                
                                                    
                 Level Translators
                
                                                    
                 VDDB
                
                                                    
                 VDDA
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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                on Jan 25, 2021 6:24 PM
            
            
												
						in reply to Christian
					
									
        
	
        

		
		
        
					
         I appreciate the reply. Are you saying that the "ADG3123 will operate fine" with my voltage range because the part will not be susceptible to damage? Or, will the part function properly? I'm assuming the part needs a minimum VDDA/VDDB to fundamentally operate as a level translator. 
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
						
                            
            
            				
            
                on Jan 25, 2021 10:42 PM
            
            
												
						in reply to strocchia1
					
									
        
	
        

		
		
        
					
        Hi Scott,
        

        The part will still operate with your given voltage ranges but, we can't guarantee that the timing and digital I/O levels are still the same as indicated in the specifications table. To ensure that the parameters are met, the potential differences between the supply nodes are within the minimum and maximum range specified in the power requirements section.
        

        Also, what are your specific applications and the voltage levels you are level translating? This information will help us identify the best level translator suited for your application.
        

        Best regards,
        Christian
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Jan 25, 2021 10:54 PM
            
            
												
						in reply to Christian
					
									
          
	
          

		
		
          
					
          My target application incorporates a custom display driver, so the fact that ADG3123 is used for LCD displays intrigued me. However, unlike LCD, our voltage ranges are not quite as high -- typically 5V on the positive rail and -5V->0V on the negative rail.
          

          For reference, i have been using the ADG1234 as a level shifter component for prior projects. The ADG3123 might represent a higher-channel-count solution.
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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          •  Analog Employees  
          
            
						
                            
            
            				
            
                on Jan 25, 2021 11:26 PM
            
            
												
						in reply to strocchia1
					
									
          
	
          

		
		
          
					
          Hi Scott,
          

          The ADG1234 is a Quad Single Pole, Double Throw (SPDT) switch that is not capable of level translation between the input and output.
          

          The level translators are capable of translating voltages to a higher (up translate) or lower (down translate) levels. The ADG3123 is a level translator that translates the input signals into voltage output levels set by the VDDA, VDDB, and VSS supplies.
          

          For us to further identify the specific part (switch or level translator) that is best suited for your application, can you send us a copy of your schematic here or through email where you used the ADG1234?
          

          Best regards,
          Christian
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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