Multiplexing analog signal

Discussion in 'General Electronics Chat' started by adrian.dmc, Feb 5, 2008.

  1. adrian.dmc

    Thread Starter Active Member

    Feb 22, 2007
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    I'm using a Picaxe PIC for a project and I want to have 4 analog signals connected to the same input (before you ask it's just my way of learning new stuff) I'm an expert in digital circuits so my idea is to create a analog multiplexer (4:1). Is this possible? If yes: how?

    Thx...
     
  2. thingmaker3

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  3. Ron H

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  4. nomurphy

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    For wider voltage ranges, try the DG409 or older ADG509.

    For an 8:1, I believe its the DG508.
     
  5. Ron H

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    I suggested the 74HC parts because he said he was interfacing with a PIC. It's true that they can only handle about 0-5V.
     
  6. adrian.dmc

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    Feb 22, 2007
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    Thank for your answers... I'll use the 74HC farts for its easy interfacing and because the 0 to 5V limit is not a worry.
     
  7. nomurphy

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    Just to be clear, the switching/addressing logic is all relative to +5V.

    But if your switched I/O signals are greater than +/-5Vpk, then you can't/shouldn't use the HC/HCT parts.
     
  8. Papabravo

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    Feb 24, 2006
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    The old CD4066 has 4 individual switches which can be configured as a 4:1 mux and lots of other things as well.
     
  9. adrian.dmc

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    Feb 22, 2007
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    The purpose of the signals will be to carry sensors data (temperature, light, ...). When I design the sensors I'll make their output between 0 and 5V. Is this possible? My doubt comes from the Vee voltage can someone explain it to me?

    EDIT: and what Vcc has to do with Vee?
     
  10. Papabravo

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  11. Ron H

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    It's possible. If you need help, you'll need to post what kind of sensors you have, with datasheets if possible.

    EDIT: You should be able to do it without a negative supply.
     
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