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Off State Leakage of ADG201A-EP



		

			

									
					    EVoyager
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 24, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I know from datasheet of ADG201A-EP that the maximum OFF state leakage of this IC with power supply =+/-15V and VD = ±14 V, VS = ∓14 V is 100nA. This leakage is too much for the circuit that I am designing. But the input signal range in my application is much less that that is given in the datasheet. Power supply to this IC is +/-15V. The input signal range will be +/- 2V. I would like to know what will be the maximum OFF state leakage for this IC over the operating temperature range of -55C to 125C for this input range? Will there be a reduction from the datasheet values?
    
 
    Thanks
    
 
    Shihab.
    
									
			        
		
    

				
						
        

    
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                on Feb 9, 2018 3:04 PM
            

            
					
        
	
        

		
		
        
					
        Hi,
        
 
        Thank you for the reply.
        
 
        I cannot provide the actual circuit I am working with. But following is my application,
        
 
        I have 4 sensor outputs. Each output is differential output. I have used resistor dividers in front of the Instrumentation Amplifier (INA )to attenuate the sensor signal. Each channel of Analog switch is connected across the INA inputs. During a fault condition an over voltage will occur across INA which will be seen at the output of INA and damage the ADC. So an over voltage detection circuit is used to short the INA inputs so that output will be zero and the ADC is protected during fault condition.
        
 
        I have selected ADG1212 for this application because of its lowest leakage (1nA over -55C to 125C). But when I simulated the circuit I got leakage current which is in the range of uA. Also I do not want inter channel interference to happen. But as per my simulation, I see leakage current in uA range in other channels when they are not being used. Why I am not getting off state leakage <1nA as per datasheet?
        
 
        Thanks,
        
 
        Shihab.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Feb 9, 2018 3:04 PM
            

            
					
          
	
          

		
		
          
					
          Hi,
          
 
          Thank you for the reply.
          
 
          I cannot provide the actual circuit I am working with. But following is my application,
          
 
          I have 4 sensor outputs. Each output is differential output. I have used resistor dividers in front of the Instrumentation Amplifier (INA )to attenuate the sensor signal. Each channel of Analog switch is connected across the INA inputs. During a fault condition an over voltage will occur across INA which will be seen at the output of INA and damage the ADC. So an over voltage detection circuit is used to short the INA inputs so that output will be zero and the ADC is protected during fault condition.
          
 
          I have selected ADG1212 for this application because of its lowest leakage (1nA over -55C to 125C). But when I simulated the circuit I got leakage current which is in the range of uA. Also I do not want inter channel interference to happen. But as per my simulation, I see leakage current in uA range in other channels when they are not being used. Why I am not getting off state leakage <1nA as per datasheet?
          
 
          Thanks,
          
 
          Shihab.
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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