What does it mean to measure DAC's INL and DNL at a high frequency

Discussion in 'The Projects Forum' started by shantanu, Dec 27, 2008.

  1. shantanu

    Thread Starter Member

    May 26, 2008
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    Hi All,

    I am working on Digital to Analog converter Project , I went through several text but can't convince myself. I want to know what is the meaning of testing a DAC for INL and DNL at high frequencies, not at dc. This is for practical DAC chip.

    I can do static testing by applying the inputs one by one and measure the DAC's out put to test INL and DNL but what does it mean when I put continuously changing digital input code at the inputs of a 6bit or 12bit DAC pin and then test for INL and DNL and also how I can do that in practical circuit.

    " very steep learning curve ....:("
     
  2. mik3

    Senior Member

    Feb 4, 2008
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  3. shantanu

    Thread Starter Member

    May 26, 2008
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    thanks for the reply. I am going through the text.
     
  4. shantanu

    Thread Starter Member

    May 26, 2008
    25
    0
    hi, the link you have posted in the message is not for DAC its for ADC's.
     
  5. mik3

    Senior Member

    Feb 4, 2008
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  6. shantanu

    Thread Starter Member

    May 26, 2008
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    0
    sorry @ mik3 , I think I should have told your earlier or mentioned it , I want to test the chip in school setting.Only equipments I have in lab is a mixed signal scope, a function generator and bunch of DC power supply. For an ADC or precisely for digital outputs I just have few counters ( TTL chips).

    I don't have spectrum analyzer in my lab and have to learn to use one ( which is not a problem), I want to know with stuff mentioned, at my disposal, how can I go ahead and test my DAC chip for INL and DNL.

    Any ideas by any users are appreciated.

    regards
    S
     
  7. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Some scopes have a built-in spectrum analyzer, check it.
     
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