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ADG5404F Recommended for New Designs
The ADG5404F is an analog multiplexer composed of four single channels with fault protected inputs. The ADG5404F switches one of the four inputs to a common...
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ADG5404F on Analog.com

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ADG5404F switch noise

		
	
				

			

									
					    KXBY
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 10, 2019 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user experiences a 5V, 400ns pulse at the D port of the ADG5404F when switching address lines A1 and A0, likely due to charge coupling or charge injection. Adding a 1nF capacitor in parallel with the pull-down resistor eliminates the pulse but reduces the bandwidth. The support engineer suggests considering the ADG5209F, which has lower capacitance and charge injection, and requests scope plots for further analysis.
                        	    

                
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I'm using the ADG5404F. When I switch the addree A1 and A0, A 5V pulse of approximately 400ns long appears at the D port. This has a serious impact on my system. Is there any solution to remove it? The VDD is 8V. The VSS is -8V. There is 32 adg5404F In my design. The toggle of address line is slow. 

			

			
									
		                             
                        

    

                                            
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                 Latch-Up Immune and High ESD Switches and Multiplexers
                
                                                    
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 11, 2019 8:52 AM
            
            
						
			            		
    
		
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    Hi,
    

    This sounds like it could be caused by charge coupling or charge injection.
    

    See MT-088 for explanation of these effects.
    

    

    Have you looked at the ADG52xxF family. depending on your application you may be able to use an ADG5209F (this is a Dual 4:1 Mux). these devices have lower capacitance and charge injection which could help with your issue. Can I ask what the drain pin is connected to? 
    

    

    Do you have any scope plots that you could share with me?
    

    

    Regards,
    

    David
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jun 16, 2019 9:38 PM
            
            
												
						in reply to Davidforde
					
										
			            		
    
		
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    The drain is connect to a pull-down resistor. When I connect a 1nF capacitor In parallel with the resistor, the pulse disappears. However, The bandwidth of ADG5404F significantly reduces. The figure below shows the measured switch noise.   
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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