What is comparator threshold voltage?

Discussion in 'Homework Help' started by exidez, Oct 30, 2008.

  1. exidez

    Thread Starter Member

    Aug 22, 2008
    26
    0
    Her is the question:
    the successive approximation ADC shown in Figure 6.1, the clock frequency is 1.0MHz; the comparator Threshold voltage VT = 0.1mV, the DAC has a Full Scale output of 10.23 V and a 10 bit input.. Determine:
    3.4.1 the digital equivalent obtained for VA = 3.728 V;


    Pic is attached

    i am new to this binary stuff and i have no idea how to do it.
    if the range is 10.23 V and is a 10 bit system
    2^10 - 1 = 1023 steps

    10.23 / 1023 = 0.01 V per step

    Thats as far as i got, i dont even understand the diagram!
     
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  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    In operation the counter goes from 0 to some number as it it clocked. With each clock, the output voltage increases by 10 mv. When the voltage out of the DAC matches the input voltage, the comparator stops the counting and sends the EOC. The value in the counter is the conversion.
     
  3. exidez

    Thread Starter Member

    Aug 22, 2008
    26
    0
    thanks for that, base on that information i can derived to an answer.
    Thanks
     
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