Interfacing to the Analog World Questions and Answers

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Q21
Which of the following characterizes an analog quantity?
  • A Discrete levels represent changes in a quantity.
  • B Its values follow a logarithmic curve.
  • C It can be described with a finite number of steps.
  • D It has a continuous set of values over a given range.
Answer: Option D
Q22
A 4-bit stairstep-ramp A/D converter has a clock frequency of 100 kHz and maximum input voltage of 10 V.
  • A The maximum number of samples per second will be 6250.
  • B The maximum sample rate will be 100,000 samples/second.
  • C The minimum sample rate will be 6250 samples/second.
  • D The minimum sample rate will be 100,000 samples/second.
Answer: Option C
Q23
What is the accuracy of a D/A converter?
  • A It is the reciprocal of the number of discrete steps in the D/A output.
  • B It is the comparison between the actual output of the converter and its expected output.
  • C It is the converter's ability to resolve between forward and reverse steps when sequenced over its entire range of inputs.
  • D It is the deviation between the ideal straight-line output and the actual output of the converter.
Answer: Option B
Q24
An analog quantity varies from 0–7 V and is input to a 6-bit A/D converter. What analog value is represented by each step on the digital output?
  • A 0.111 V
  • B 1.17 V
  • C 0.109 V
  • D 0.857 V
Answer: Option A
Q25
Inaccurate A/D conversion may be due to:
  • A constant analog input voltage
  • B linear ramp usage
  • C intermittent counter inputs
  • D faulty sample-and-hold circuitry
Answer: Option D
Q26
What is the resolution, in percent, of a 12-bit DAC?
  • A 8.33
  • B 0.049
  • C 0.000488
  • D 0.083
Answer: Option B
Q27
What circuitry is on an ADC0808 IC?
  • A A multiplexer
  • B An ADC
  • C A 3-bit select input code
  • D All of the above
Answer: Option D
Q28
What is the maximum conversion time for an 8-bit successive-approximation ADC with a clock frequency of 20 kHz?
  • A 12.8 ms
  • B 6.4 ms
  • C 0.05 ms
  • D 0.4 ms
Answer: Option D
Q29
What is one advantage to using a parallel-encoded (flash) ADC?
  • A less expensive
  • B very fast conversion
  • C less complicated circuit
Answer: Option B
Q30
If the same analog signal is to be converted to an 8-bit resolution using a counter-ramp ADC, how many comparator circuits would be used?
  • A 1
  • B 8
  • C 127
  • D 255
Answer: Option A

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