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Need help with a multiplexer

Discussion in 'Electronics Homework Help' started by Stoneww, Feb 28, 2020.

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  1. Stoneww

    Stoneww

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    2
    Apr 18, 2017
    Hey,

    I have a project and I want to use a multiplexer to periodically switch between 5 different inputs (analog) to be output one by one, the output will be fed to a microcontroller. The same microcontroller is used to signal which input should be output.
    NOTE: the voltages read by the mux will be between 0 V and 5 V.

    I assumed that the multiplexer has to be one that is labelled as "analog" due to the type of inputs I am using.

    I wanted to use the DG408, however I have a 9 V power supply and the data sheet specifies that one of the pins needs to be connected to "V-". I'm wondering if it would be okay to leave that pin either not connected or grounded and only use "V+" and "GND" to power the component?

    If not, can someone suggest a multiplexer I can use to achieve this? I'm struggling to find one.

    King regards.

    DG408 Datasheet:
    https://www.renesas.com/us/en/www/doc/datasheet/dg408-09.pdf
     
    Last edited: Feb 28, 2020
  2. bertus

    bertus Moderator

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    Nov 8, 2019
  3. Stoneww

    Stoneww

    42
    2
    Apr 18, 2017
    TCRT 5000 sensors, they will output between 0 and 5 volts.
     
  4. Stoneww

    Stoneww

    42
    2
    Apr 18, 2017
    Also that one requires VDD, VEE and VCC. And with a battery powered I can't really provide negative voltage.
     
  5. bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    That should not be a problem.
    The datasheet shows these schematics:

    cd4051_bias.png

    Perhaps the same can be done with the DG408.

    Bertus
     
  6. Stoneww

    Stoneww

    42
    2
    Apr 18, 2017
    Ye looks good, you think this can also be the case for the MUX I used?
     
  7. bertus

    bertus Moderator

    1,864
    707
    Nov 8, 2019
    Hello,

    Reading the datasheet, the powersupply may be single ended:

    DG408_feature.png

    Bertus
     
    Stoneww likes this.
  8. Stoneww

    Stoneww

    42
    2
    Apr 18, 2017
    Okay thanks, I think Will switch to the one you first suggested
     
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