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Analog Multiplexer Using ADC

  1. Aug 28, 2008 #1
    Is it possible? Feasible?
     
  2. jcsd
  3. Aug 28, 2008 #2

    mgb_phys

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    So a bunch of separate ADCs, some network hardware and a bunch of DACs and output amps?
    Any reason to do this rather than just an analogue MUX?
     
  4. Aug 28, 2008 #3

    berkeman

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    The function of an Analog-to-Digital converter (ADC) is nothing like an analog MUX function. What are you trying to do?
     
  5. Aug 28, 2008 #4

    chroot

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    Using only ADCs? No, it's not possible.

    - Warren
     
  6. Aug 29, 2008 #5
    Oh wait, I'm sorry... I meant, multiplexing multiple analog signals then feeding it to an ADC...
     
  7. Aug 29, 2008 #6

    berkeman

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    Yes, that's done all the time. You use the MUX as the sample part of your sample and hold circuit, with the hold cap between the MUX and the ADC input. The sample time depends on the impedance of the MUX switches.
     
  8. Aug 29, 2008 #7

    rbj

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    but don't do that with a sigma-delta ADC, unless the MUX switching rate is far, far slower than the clock for the sigma-delta ADC.
     
  9. Aug 30, 2008 #8
    Thanks guys :)
     
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