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LTC2497 off isolation



		

			

									
						phnguyen
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Dec 28, 2021 
				
			
			
		


				
		

		    		    
		    
		    	
			
Dear Sir,




This is Phat Nguyen from Ampere Computing Vietnam. I'm working in Hardware platform design for data center. I used the LTC2497 to read voltage ADC. I see in LTC2497's datasheet, when controller is off (VCC=0), the QIRR = 120dB. It means the input will be High-Z, is it correct?


I appreciate for your feedback. 




 


Thanks


Phat



								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			








	
	
	
	



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                                 Analog Employees 
                                
                            
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                on Jan 28, 2022 2:33 PM
            
            
					
    
	
    

		
		
    
					
    Hi Phat,
    

    When it says MUX Off, it does not mean VCC=0V. It means that the MUX switch is open. VCC should be in the normal input range for this spec to apply. Any voltage change on the MUX input will be reduced by 120dB on the MUX output if the input voltage frequency is less than or equal to 1.8MHz.
    

    IDC_LEAK(IN) (10nA max) is a better indicator of input impedance of the MUX inputs. This spec also only applies when VCC is in it's normal operating range.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on Jan 28, 2022 2:33 PM
            
            
					
    
	
    

		
		
    
					
    Hi Phat,
    

    When it says MUX Off, it does not mean VCC=0V. It means that the MUX switch is open. VCC should be in the normal input range for this spec to apply. Any voltage change on the MUX input will be reduced by 120dB on the MUX output if the input voltage frequency is less than or equal to 1.8MHz.
    

    IDC_LEAK(IN) (10nA max) is a better indicator of input impedance of the MUX inputs. This spec also only applies when VCC is in it's normal operating range.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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