Analog and Digital Converts Questions and Answers

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Q1
Which of the following is a type of error associated with digital-to-analog converters (DACs)?
  • A nonmonotonic error
  • B incorrect output codes
  • C offset error
  • D nonmonotonic and offset error
Answer: Option D
Q2
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.
  • A 0.3125 V
  • B 3.125 V
  • C 0.78125 V
  • D –3.125 V
Answer: Option B
Q3
A binary-weighted digital-to-analog converter has an input resistor of 100 komega.gif. If the resistor is connected to a 5 V source, the current through the resistor is:
  • A 50 mu.gifA
  • B 5 mA
  • C 500 mu.gifA
  • D 50 mA
Answer: Option A
Q4
What is the resolution of a digital-to-analog converter (DAC)?
  • 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.
Answer: Option C
Q5
The practical use of binary-weighted digital-to-analog converters is limited to:
  • A R/2R ladder D/A converters
  • B 4-bit D/A converters
  • C 8-bit D/A converters
  • D op-amp comparators
Answer: Option B
Q6
The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:
  • A quantization
  • B accuracy
  • C resolution
  • D monotonicity
Answer: Option C
Q7
A binary-weighted digital-to-analog converter has a feedback resistor, Rf, of 12 komega.gif. If 50 mu.gifA of current is through the resistor, the voltage out of the circuit is:
  • A 0.6 V
  • B –0.6 V
  • C 0.1 V
  • D –0.1 V
Answer: Option A
Q8
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?
  • 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.
Answer: Option B
Q9
The resolution of a 0–5 V 6-bit digital-to-analog converter (DAC) is:
  • A 63%
  • B 64%
  • C 1.56%
  • D 15.6%
Answer: Option C
Q10
In a flash analog-to-digital converter, the output of each comparator is connected to an input of a:
  • A decoder
  • B priority encoder
  • C multiplexer
  • D demultiplexer
Answer: Option B

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