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AD688 Production
The AD688 is a high precision ±10 V tracking reference. Low tracking error, low initial error and low temperature drift give the AD688 reference absolute...
Datasheet
AD688 on Analog.com

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Wich Supply Voltage for the AD688 is necessary?



		

			

									
					    Fabi97
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 27, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello community,
    

    

    I need a high precision reference voltage for my 16 Bit DAC, so i decided to use the AD688.
    

    In the Datasheet the IC is supplyed by a voltage of +-15 V, but in my circuit I have only +-14 V or less.
    

    Is it possible to use the AD688 with a +-14 V or +-13 V power supply insted?
    

    

    best regards
    

    Fabian
    
									
			        
		
    

				
						
        

    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 28, 2019 10:18 PM
            
            
					
      
	
      

		
		
      
					
      Hi Fabian,
      

      Currently I'm not sure what is the minimum voltage supply that the AD688 will work, but I'm looking in to this and will get back to you as soon as possible.
      

      In my speculation, it will work on +-14V. This is because, as you may have notice, the Line Regulation is tested at +-18V and at +-13.5V. But this is the only specs that is tested on this voltages. Other specs values will be near to the current value though, but not exactly.
      

      Is there a reason for the +-14V? Considering normally the voltage supplies are normally specs at +-15,20, or 25.
      

      

      Regards,
      

      Mon 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 28, 2019 10:18 PM
            
            
					
      
	
      

		
		
      
					
      Hi Fabian,
      

      Currently I'm not sure what is the minimum voltage supply that the AD688 will work, but I'm looking in to this and will get back to you as soon as possible.
      

      In my speculation, it will work on +-14V. This is because, as you may have notice, the Line Regulation is tested at +-18V and at +-13.5V. But this is the only specs that is tested on this voltages. Other specs values will be near to the current value though, but not exactly.
      

      Is there a reason for the +-14V? Considering normally the voltage supplies are normally specs at +-15,20, or 25.
      

      

      Regards,
      

      Mon 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Nov 29, 2019 5:25 AM
            
            
												
						in reply to ADIApproved
					
									
        
	
        

		
		
        
					
        Hey Mon,
        

        thank you for your response.
        

        Of course I noticed the maximum ratings and the specs of the Line regulation...
        

        I'm designing a low noise circuit, which is basically a femto ampere current source with a 16 Bit DAC as regulation. So I need a very precision reference to manage the 16 Bit. To prevent power loss I want to use a +-15V and 5V switching regulator with a ultra low noise LDO behind. The LDO are the LT3045 and LT3094. The maximum input voltage of these are 20V and I can adjust the output voltage by a single resistance. To prevent heat and because its a unique pcb +-14V is ok for me.
        

        I also think that +-14V will work but I thought that maybe someone had already tested it so I can be sure. It's kind of sad, because it is a very expensive IC so I would expect a clear declaration about the min and max supply voltage.
        


        Regards,
        

        Fabian
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
						
						
				
				
		
		
        
			
		
        
	
        

        

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