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HELP Muxed a/d

Discussion in 'Electronic Basics' started by Razzel, Oct 19, 2004.

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  1. Razzel

    Razzel Guest

    I have a program which reads an ADC0831 via the parallel port. I occurs
    to me that by using a CD4053 and sending it signals via the RS232 data
    lines that I might be able to selectively read an ADCs data out line.
    This would be accomplished by a minor mod to my existing program.

    My concern is in adding the load of 2 more ADCs to the port and the
    effect that will have RS232 lines 1, 3, & 4 are output from the
    computer. I can't see that connecting the 3 together would effect the
    ADC but I am not sure.

    Can someone with this experience satisfy my anxiety?

  2. Bob Masta

    Bob Masta Guest

    Why complicate things by adding a serial port?
    You don't describe how you are reading the ADC
    with the parallel port, but there are probably some
    lines available there. If you are using the Data
    address as input, you can use a couple of the
    Control lines to control the 4053. If you are using
    Status lines as input, you have 8 Data lines to
    choose from.

    I'm a little confused about your comment on
    the "load of 2 more ADCs". You will be
    connecting your 3 analog inputs to the 4053.
    The single ADC sees the output of the 4053 and is
    connected to the port as usual. The only
    change is 2 extra port outputs to switch the
    4053, a negligible load on the port.

    Best regards,

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
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