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ADG408 Production
The ADG408 is a monolithic CMOS analog multiplexer comprising 8 single channels. The ADG408 switches one of eight inputs to a common output as determined...
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ADG408 on Analog.com

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ADG408 and 409 multiplexer



		

			

									
					    Tom1966
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 22, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello, i want to replace the multiplexers in audio devices with these types. The old ones are CD4051 and 4052 CMOS. Yes, i know they are not pin compatible, but this won´t be a problem. The ADG type should have some advantages as low noise and the cut-off before switching. 
    

    Now, i want to know if i have to change the design for the following buffer stage or could it be used like for the CD types? I have not found any sample circuits or plans for audio usage...
    

    I would be glad if anyone has some tips or informations for me
    

    Thanks 
    

    Tom
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Feb 23, 2021 11:58 AM
            
            
					
      
	
      

		
		
      
					
      Hi, Tom.
      

      Could you share more details about this application? Information like voltage range, supply voltage, operating frequency and a schematic will help us better understand your question.
      

      Yours sincerely,
      

      Igor.
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Feb 23, 2021 6:04 PM
            
            
												
						in reply to ADIApproved
					
									
        
	
        

		
		
        
					
        System has thrown out my picture... once again.
        

        I´m working on a vintage amplifier made by dual (company originally doesn´t exist anymore). They have bought out in their last steps two amps with a complete multiplexer control (no potis inside). All inputs, volume control, bass treble and balance is switched by CD4051 multiplexers. For this age a revolution. They are working with +/-7.5V regulated; the buffer op-amps +/-15V and the max of this power source has +/-18V. The frequency is the normal audio range; at least 20-20000HZ with no deviation.
        

        Now. i want to replace this chips with the named types cause the they have no break before... and are not really low noise.
        

        I try to find a solution to upload the schematics, but in www you can find easily the plan of the DUAL RC440 amp.
        

        Regards
        

        Tom
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
			                            
                        
                on Feb 25, 2021 4:44 PM
            
            
												
						in reply to Tom1966
					
									
        
	
        

		
		
        
					
        Hi, Tom.
        

        Apologies for the late reply.
        

        If the voltage passing through the switch are withing the switch's rails, VDD and VSS (+/-7.5 V in your case), it should be okay for you to replace the CD4051 and CD4052 with the ADG408 and ADG409.
        

        Your frequency range should be within the -3dB bandwidth of these two switches as well.
        

        If you are looking at higher precision and low signal distortion, I recommend that you use the ADG1408 and ADG1409.
        

        Unfortunately, I did not find the schematics for the DUAL RC440/RC441 amp you suggested. Could you share these with me?
        

        Yours sincerely,
        

        Igor.
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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													+1
							
			
				
									
							        
			
			
			
        •  Analog Employees  
        
            
			                            
                        
                on Feb 25, 2021 4:44 PM
            
            
												
						in reply to Tom1966
					
									
        
	
        

		
		
        
					
        Hi, Tom.
        

        Apologies for the late reply.
        

        If the voltage passing through the switch are withing the switch's rails, VDD and VSS (+/-7.5 V in your case), it should be okay for you to replace the CD4051 and CD4052 with the ADG408 and ADG409.
        

        Your frequency range should be within the -3dB bandwidth of these two switches as well.
        

        If you are looking at higher precision and low signal distortion, I recommend that you use the ADG1408 and ADG1409.
        

        Unfortunately, I did not find the schematics for the DUAL RC440/RC441 amp you suggested. Could you share these with me?
        

        Yours sincerely,
        

        Igor.
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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