Multiplexers

Discussion in 'General Electronics Chat' started by Siyom, Oct 12, 2012.

  1. Siyom

    Thread Starter Member

    Aug 9, 2012
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    Which multiplexers can i use to switch between two voltages,5 and -9V.I've tried using an analog switch but am supplying it with 5 volts so it cannot switch higher voltages.
    I've tried scaling down the voltages but i cannot get the switch to switch negative voltages.
    Any help with this regard will be highly appreciated
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    We might be able to help if you tell us why you want to do this.
     
  3. Siyom

    Thread Starter Member

    Aug 9, 2012
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    Am using them as reference voltages for an A/DC
     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    What is the part number of your ADC?
     
  5. crutschow

    Expert

    Mar 14, 2008
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    Why not use the -9V to power the negative voltage on the mux (CMOS muxes take only microamps of operating current). That would allow you to switch both the +5V and -9V. For example you can power the CD4051/52/53 with Vdd= +5V, Vss = 0V, and Vee= -9V, and then the mux will switch +5V to -9V with a 0-5V logic signal.

    What type of ADC takes a negative reference voltage?
     
  6. Siyom

    Thread Starter Member

    Aug 9, 2012
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    Dual slope integrating ADC
     
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