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Thread: Analog to digital converter

  1. #1

    Default Analog to digital converter

    hey,i need an A to D, and then a D to A converter. Has anyone done that before? I need it for communication.
    What chip would be nice? I want the whole thing to be portable.

    Thankss

  2. #2
    Senior Member Android
    Join Date
    Nov 2004
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    144

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    Do you think information provided by you is sufficient for anybody to pick out a right converter for you? No clues.....nothing!!

  3. #3
    Senior Member T-1000
    Join Date
    Jun 2004
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    Bombay/Mumbai
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    I normally use TI's serial DACs and ADC's .
    They are very easy interface and require no extra components at all .
    You clock in 8 cycles and the IC responds by giving 8 bits out

    Ive interfaced the TLC549 8 bit ADC with a PIC16F84a to get voltage readings from a temperature sensor.
    The codes and schematics can be found here in my temperature controller project
    http://www.machinegrid.com/content/view/51/108/

    RI also mirrors it here
    http://www.roboticsindia.com/modules...rder=0&thold=0


    I just finished implementing the TLC1549 DAC .I'll put put the schema/codes when i get the time

  4. #4
    Senior Member Cyborg
    Join Date
    Sep 2004
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    ADC -
    For beginners I would reccomend
    ADC0809
    Rs 135 types i guess

    8 bit, and parallel output. just single pin control.
    simple to interface after you read the datasheet
    (search analog devices website) or also explained in Gaonkar i guess.
    a popular 8085 cpu book in engineering.

    DAC -
    it depends on how mouch you can spend and would like to work.
    Gerrys idea of using a TI dac is good.
    my suggested chips my cost rs 1000+ so i wont suggest an IC.

    low resolution dac can be made by a simple op-amp and some resistors.

    OR

    if you know how to generate PWM using the MCU you are plannig to use,
    you can feed the PWM to a simple RC low-Pass-filter (1 R and 1 C, Re 1)
    and the output would be analog voltage proportional to the duty-cycle of the PWM.
    the PWM frequency should be aleast 10 times the time constant of RC (R*C)
    this method requires only 1pin from your cpu, and almost not software.

    cheers!
    Vivek
    Vivek
    --
    " To get working ideas effectively, I try to fail as fast as I can. "
    Richard Feynman
    --
    http://www.youtube.com/watch?v=JqlawTD_9B0

  5. #5
    Senior Member Cyborg
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    Sep 2004
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    oops - search ADC0809 at national semiconductor

  6. #6
    Guest

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    Thanks vivek,ice! I appreciate your help

  7. #7

    Default

    Oops,i had forgotten to sign in last time.Thanks guys

  8. #8

    Default

    Hey jack, i guess you were right, but ice and vivek are just brilliant

  9. #9

    Default

    There are few people who like to share whatever they know.

    Thanks ice and vivek

  10. #10
    Senior Member T-1000 akshay66's Avatar
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    Dec 2008
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    New Delhi
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    Can you please tell me what are you trying to make??

    Regards Akshay,
    Redefine it your way!!!!

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