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- Question
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
- Correct Answer
- 4-bit D/A converters
- 1. 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
- 2. 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 Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. Which is not an analog-to-digital (ADC) conversion error?
Options- A. differential nonlinearity
- B. missing code
- C. incorrect code
- D. offset Discuss
- 10. Sample-and-hold circuits in analog-to digital converters (ADCs) are designed to:
Options- A. sample and hold the output of the binary counter during the conversion process
- B. stabilize the comparator's threshold voltage during the conversion process
- C. stabilize the input analog signal during the conversion process
- D. sample and hold the D/A converter staircase waveform during the conversion process Discuss
Analog and Digital Converters problems
Search Results
Correct Answer: 3.125 V
Correct Answer: 50 µA
Correct Answer: ?0.6 V
Correct Answer: nonmonotonic and offset error
Correct Answer: a large number of comparators is required to represent a reasonable sized binary number
Correct Answer: resolution
Correct Answer: It is the smallest analog output change that can occur as a result of an increment in the digital input.
Correct Answer: It only uses two different resistor values.
Correct Answer: differential nonlinearity
Correct Answer: stabilize the input analog signal during the conversion process
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