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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...
Datasheet
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

			

			
									
		                             
                        

    

                                            
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                on Jun 20, 2018 1:26 AM
            
            
						
			            		
    
		
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    Thank you for response.
    
 
    We are using LTspice. We wrapped up subcircuits of ADG721 series by LTspice
    
 
    feature.
    
 
    Meanwhile, we droped ADG721due to unclear behavior and our new requirement
    
 
    of quad inputs.
    
 
    Now we are using ADG442B... It works well.
    
 
    I am not allowed to share the files.
    
 
    Besides circuit files, we can point out the following:
    
 
    From the datasheet and the cir files, it is obvious that ADG721 and ADG722
    
 
    should be exchanged.
    
 
    Best regards,
    
 
    jo
    
 
    On Wed, Jun 20, 2018 at 9:56 AM, mayp <
    
			
    

		
			
	      

				
    
			
			
		
    
			
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jun 20, 2018 1:26 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Thank you for response.
    
 
    We are using LTspice. We wrapped up subcircuits of ADG721 series by LTspice
    
 
    feature.
    
 
    Meanwhile, we droped ADG721due to unclear behavior and our new requirement
    
 
    of quad inputs.
    
 
    Now we are using ADG442B... It works well.
    
 
    I am not allowed to share the files.
    
 
    Besides circuit files, we can point out the following:
    
 
    From the datasheet and the cir files, it is obvious that ADG721 and ADG722
    
 
    should be exchanged.
    
 
    Best regards,
    
 
    jo
    
 
    On Wed, Jun 20, 2018 at 9:56 AM, mayp <
    
			
    

		
			
	      

				
    
			
			
		
    
			
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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