help with adc tester

Discussion in 'The Projects Forum' started by hamed_azhar, Feb 24, 2015.

  1. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    hello guys,
    can anyone help me with an adc0804 tester circuit other than the basic one which is found in the datasheets?
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    What do you want to test?
     
  3. crutschow

    Expert

    Mar 14, 2008
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    The data sheet has a very large number of specified parameters.
    Mike is asking which of those do you want to test for?
    Testing all of them would require a bench full of expensive test gear and hours of test time.
     
  4. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    i just want to test the adc0804 ic since it cannot be tested using universal ic tester
     
  5. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    i just want to test the adc0804 ic since it can't be tested using universal ic tester
     
  6. crutschow

    Expert

    Mar 14, 2008
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    That doesn't answer out question.
    You are just repeating your original question.
    Do you just want to do just a basic functional test?
     
  7. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    Yes, I need to do a functional test so that I can use this ic without any problem.
     
  8. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    I also need to check its linearity as well as the full-scale properties.
     
  9. crutschow

    Expert

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    What "full-scale properties"?
     
  10. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    Sorry i meant checking the ic's total unadjusted error which should be within the range (+/- )1 LSB
     
  11. crutschow

    Expert

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    One way to do that test is to use a DAC that has more bits resolution and an error must less than 1 LSB of the ADC value (say 1/10th or less) to provide a test voltage.
    The output of the DAC goes to the input of the ADC.
    Then you digitally increase the output of the DAC from 0V to full-scale using a microprocessor while monitoring the digital output of the ADC.
    From that the microprocessor can calculate the deviation of each output bit's error from the ideal.
     
  12. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    Do you have the circuit diagram for this?
     
  13. MrChips

    Moderator

    Oct 2, 2009
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    This is a standard way of testing an ADC.
    This is a concept. No circuit diagram is required.
     
  14. crutschow

    Expert

    Mar 14, 2008
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    No. That would depend upon the ADC you want to test, the DAC you want to use, as well as which microprocessor will control the testing.
    Are you familiar with microprocessor programming?
     
  15. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    I want to test adc0804, but i dont know about which dac and microprocessor should be used. Also, I am not familiar with the programming too. Can i use microcontroller instead?
     
  16. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    Can i chat with u online?Because its a very urgent matter. My email id <snip>

    Edit: email address removed to prevent exploitation by spammers.
     
    Last edited by a moderator: Mar 2, 2015
  17. crutschow

    Expert

    Mar 14, 2008
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    It's best to continue in this thread so everyone can contribute and benefit from the discussion.

    A microcontroller requires the same programming expertise as a microprocessor.

    It likely would be easiest to use a USB acquisition module such as this, and do the calculations, measurement, and control using a PC.
     
  18. hamed_azhar

    Thread Starter New Member

    Feb 24, 2015
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    How to program PIC microcontroller to use it as DAC ? Given set of digital inputs, I have to convert each of them to analog voltages with some specific equal time periods?
     
  19. crutschow

    Expert

    Mar 14, 2008
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    "How to program PIC microcontroller" is a long tutorial that can't be done here.
    Suggest you Google "PIC tutorial" for more info.
     
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