ADG408 and 409 multiplexer

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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  • 0
    •  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.

  • 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

  • +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.

Reply
  • +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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