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ADG507A Max Enable Voltage



		

			

									
						Bendr
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 19, 2016 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    I'm working on using the ADG707A Multiplexer with the AD595 Thermocouple amplifier to build a thermocouple multiplexer. I am basing it off of the thermocouple multiplexer in the application notes (AN-369). I notice that you suggest permanently enabling the multiplexer with a +5V input to prevent the AD595 from being left floating.
    
 
    From what I can tell in the data sheet, the enable pin is limited to VDD+2V and 20mA. Does this mean it would be okay to use VDD(+12V) with a current limiting resister to hold the enable pin high?
    
 
    We are using +/-12V input rails to power the ICs and it would be really nifty to use +12V rail to hold enable the multiplexer instead of creating a +5V supply just for the enable pin.
    
 
    Thanks,
    
 
    Ben