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  • Question
  • A binary-weighted digital-to-analog converter has an input resistor of 100 kΩ. If the resistor is connected to a 5 V source, the current through the resistor is:


  • Options
  • A. 50 µA
  • B. 5 mA
  • C. 500 µA
  • D. 50 mA

  • Correct Answer
  • 50 µA 


  • Analog and Digital Converters problems


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    • 1. A binary-weighted digital-to-analog converter has a feedback resistor, Rf, of 12 kΩ. If 50 µA of current is through the resistor, the voltage out of the circuit is:

    • Options
    • A. 0.6 V
    • B. ?0.6 V
    • C. 0.1 V
    • D. ?0.1 V
    • Discuss
    • 2. Which of the following is a type of error associated with digital-to-analog converters (DACs)?

    • Options
    • A. nonmonotonic error
    • B. incorrect output codes
    • C. offset error
    • D. nonmonotonic and offset error
    • Discuss
    • 3. The primary disadvantage of the flash analog-to digital converter (ADC) is that:

    • Options
    • A. it requires the input voltage to be applied to the inputs simultaneously
    • B. a long conversion time is required
    • C. a large number of output lines is required to simultaneously decode the input voltage
    • D. a large number of comparators is required to represent a reasonable sized binary number
    • Discuss
    • 4. The resolution of a 0?5 V 6-bit digital-to-analog converter (DAC) is:

    • Options
    • A. 63%
    • B. 64%
    • C. 1.56%
    • D. 15.6%
    • Discuss
    • 5. How many basic binary subtraction combinations are possible?

    • Options
    • A. 4
    • B. 3
    • C. 2
    • D. 1
    • Discuss
    • 6. A 4-bit R/2R digital-to-analog (DAC) converter has a reference of 5 volts. What is the analog output for the input code 0101.

    • Options
    • A. 0.3125 V
    • B. 3.125 V
    • C. 0.78125 V
    • D. ?3.125 V
    • Discuss
    • 7. The practical use of binary-weighted digital-to-analog converters is limited to:

    • Options
    • A. R/2R ladder D/A converters
    • B. 4-bit D/A converters
    • C. 8-bit D/A converters
    • D. op-amp comparators
    • Discuss
    • 8. The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:

    • Options
    • A. quantization
    • B. accuracy
    • C. resolution
    • D. monotonicity
    • Discuss
    • 9. What is the resolution of a digital-to-analog converter (DAC)?

    • Options
    • A. It is the comparison between the actual output of the converter and its expected output.
    • B. It is the deviation between the ideal straight-line output and the actual output of the converter.
    • C. It is the smallest analog output change that can occur as a result of an increment in the digital input.
    • D. It is its ability to resolve between forward and reverse steps when sequenced over its entire range.
    • Discuss
    • 10. What is the major advantage of the R/2R ladder digital-to-analog (DAC), as compared to a binary-weighted digital-to-analog DAC converter?

    • Options
    • A. It only uses two different resistor values.
    • B. It has fewer parts for the same number of inputs.
    • C. Its operation is much easier to analyze.
    • D. The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
    • Discuss


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