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ADCMP567 应用

		
	
				

			

									
					    clinton
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 10, 2023 
				
			
			
		
    
		
		                    	    
    
        	    
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                The user inquires about the correct configuration of LE and LEB pins for the ADCMP567 high-speed comparator to achieve hysteresis without latch. The final answer confirms that Figure 10 in the datasheet can be used, with LE grounded and LEB connected to the hysteresis voltage, to implement the desired hysteresis functionality.
                        	    
    
                
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       新的产品选用ADCMP567 高速比较器，设计中有个疑问，比较器不需要latch功能，始终处于比较状态，并且需要使用hysiersi功能。按照规格书说明，如果不需要latch，将LE接VDD，LEB接VDD-2.0 即可，若使用hystersis,需要保持LE- LEB 是个负电压，LE和LEB该如何接法，目前使用规格书给出的典型应用电路，LE接地，LEB接hystersis电压，这个电路能正常使用比较功能吗？
    

     
    
			
    
			
									
		                             
                        

    
    
                                            
                 Analog Functions
                
                                                    
                 adcmp567
                
                                                    
                 High Speed Comparators (<100ns Propagation Delay)
                
                                                    
                 comparators
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 15, 2023 8:33 PM
            
            
						
			            		
      
		
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      For the LATCH to be enabled and disabled, the inputs of LE and LEB should be complementary.
       In figure 10, LE is GND but LEB is not VDD and therefore the inputs are not complementary.
       Now as Figure 10 in the datasheet, this configuration will implement hysteresis depending on the differential voltage between LE and LEB.
      

      所以Figure10 可以实现比较功能，用LEB脚来设置迟滞电压。
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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                on Feb 3, 2026 10:08 PM
            
            
												
						in reply to guorock
					
										
			            		
        
		
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        你好！这个hysis功能是否要求输入信号是零偏置，输入+端是信号，-端接地。我们现在的应用是+端信号，-端接一个触发电平信号，信号和这个触发电平进行比较，这种应用情况下，还能用这个hysis功能吗？这种应用是否需要按照Figure 7来设计，谢谢！！
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Feb 3, 2026 10:08 PM
            
            
												
						in reply to guorock
					
										
			            		
          
		
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          你好！这个hysis功能是否要求输入信号是零偏置，输入+端是信号，-端接地。我们现在的应用是+端信号，-端接一个触发电平信号，信号和这个触发电平进行比较，这种应用情况下，还能用这个hysis功能吗？这种应用是否需要按照Figure 7来设计，谢谢！！
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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