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ADG721 Production
The ADG721, ADG722, and ADG723 are monolithic CMOS SPST switches. These switches are designed on an advanced submicron process that provides low power...
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ADG721 on Analog.com

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The misbehavior of the spice model of ADG721.cir

		
	
				

			

									
					    oyz
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on May 23, 2018 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user observed that the SPICE model of ADG721 behaves as a low-active switch, contrary to the datasheet. The support engineer confirmed the issue and will update the ADG721 and ADG722 SPICE models. The user has since switched to ADG442B, which works correctly.
                        	    

                
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I am working on the spice model of ADG721.cir.  The mux control input works as if it is low-active sw. But this is against what the datasheet says: logic 0 means sw off. Please confirm that spice model is corrent or not.

 
Many thanks. jo

			

			
									
		                             
                        

    

                                            
                 Single-Supply Analog Switches and Multiplexers
                
                                                    
                 Analog Switches Multiplexers
                
                                                    
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 19, 2018 2:00 PM
            
            
						
			            		
    
		
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    Hi Jo,
    
 
    I'm glad that you have found the ADG442 to better cater your quad input aplication.
    
 
    To verify your observations, I did try to check the model and had a quick simulation. I can confirm you are correct and thank you for bringing this to our attention. I will update both ADG721 and ADG722 spice models for correction.
    
 
    Let me know if there are other concerns.
    
 
    Best Regards,
    
 
    May
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 19, 2018 2:00 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi Jo,
    
 
    I'm glad that you have found the ADG442 to better cater your quad input aplication.
    
 
    To verify your observations, I did try to check the model and had a quick simulation. I can confirm you are correct and thank you for bringing this to our attention. I will update both ADG721 and ADG722 spice models for correction.
    
 
    Let me know if there are other concerns.
    
 
    Best Regards,
    
 
    May
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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