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adc0831 capture

Discussion in 'Electronic Design' started by Razzel, Sep 22, 2004.

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  1. Razzel

    Razzel Guest

    I have designed a data acquisition system using an adc0831 using the
    following pin configuration:
    adc0831
    1.......................DB25 (RS232) pin 4
    2.......................input thru 1k resistor and via 0.1uF to adc pin
    3
    3.......................to ground and to adc pin 2 via 0.1uF
    4.......................to ground
    5.......................to +5v (4.91v actually)
    6.......................DB25 (RS232) pin 12
    7.......................DB25 (RS232) pin 1
    8.......................to +5v (4.91v)

    The input will be muxed through CD4053 and controlled via the software.

    My initial plan was to measure values coming in between 0 and +5v. Now
    I want to measure values -2.5 to +2.5, which I gather removes the ground
    from pin 3. I learned that the values must be below 5 v but my source
    did not stipulate if this is total between pins 2 and 3 (i.e. +2.5 on 2
    and -2.5 on pin 3) or 0 to +/- 5 volts on either pin. I read the
    datasheet but am not well versed in many of the abbreviations used
    there. Could someone straighten me out on this?
    Ron
     
  2. Tim Mitchell

    Tim Mitchell Guest

    My datasheet says input range is 0V - VCC. Therefore if you want to
    measure negative voltages you will have to do some level shifting with
    an opamp.
     
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