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The LT1715 is an UltraFast™ dual comparator optimized for low voltage operation. Separate supplies allow independent analog input ranges and output logic...
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NEWER ALTERNATIVES: AD5764R Quad, 16-Bit, 1LSB INL, Bipolar Voltage Output DAC with Internal Reference AD5754R Complete, Quad, 16-Bit, Unipolar/Bipolar...
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LT1715 window comparator query.



		

			

									
					    TESTLINK
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 26, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LT1715 
    
    		        		    		    	
			
    Hi,
    

    I have some questions about the function of window comparator of LT1715.
    

    

    

    Please check if the attached circuit diagram is working well.
    

    I want the out put of LT1715 to be logic high  when the input of LT1715 is between 1.0V  and 10.0V
    

     
    

    <conditions>
    

    1. VEE=0.0V, VCC=12.0V, +VS=3.3V
    

    2. the range of Input voltage= 0.0V ~10.5V .​
    

    

    

    3. OUTA and OUTB must be logic High when the input voltage is between 1.0V and 10.0V .
    

     
    

    <Questions>
    

    1. Is "VCC=12.0V and VEE=0.0V" valid ?
    

    2. How much is the internal impedance of LT1715?
    

       Could I connect directly to the input terminal of LT1715 with the output voltage of AD5764 ( DAC ) without the resistance ?
    

    

     
    

    Best Regards,
    

    

    DS Jang
    
									
			        
		
    

				
						
        

    
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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on May 2, 2023 9:44 AM
            
            
					
      
	
      

		
		
      
					
      Hi DSJang,
      

      Having a quick look on your circuit, I don't see any issues with it.
      Though, your resistor network at the input side is blurred and I'm not sure if this configuration will give you the expected trip points. Can you give a clear picture with it?
      Because on the application stand point, this sets the trip points you want to have (1V to 10V).
      Have you tried playing around with LT1715 in LTSpice? the model is available and you can configure it to see the expected behavior of your schematic design.
      

      For the rest of the questions, VCC = 12V and VEE = 0.0V is valid based on the datasheet, and I don't see any problems directly connecting it with the AD5764's voltage output.
      

      Hope this helps DSJang.
      

      Best Regards,
      Dann
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on May 2, 2023 9:44 AM
            
            
					
      
	
      

		
		
      
					
      Hi DSJang,
      

      Having a quick look on your circuit, I don't see any issues with it.
      Though, your resistor network at the input side is blurred and I'm not sure if this configuration will give you the expected trip points. Can you give a clear picture with it?
      Because on the application stand point, this sets the trip points you want to have (1V to 10V).
      Have you tried playing around with LT1715 in LTSpice? the model is available and you can configure it to see the expected behavior of your schematic design.
      

      For the rest of the questions, VCC = 12V and VEE = 0.0V is valid based on the datasheet, and I don't see any problems directly connecting it with the AD5764's voltage output.
      

      Hope this helps DSJang.
      

      Best Regards,
      Dann
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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