Electronics-Analog and Digital Converts
Electronics-Analog and Digital Converts
1. Which of the following is a type of error associated with digital-to-analog converters (DACs)?
- nonmonotonic error
- incorrect output codes
- offset error
- nonmonotonic and offset error
2. 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.
- 0.3125 V
- 3.125 V
- 0.78125 V
- –3.125 V
3. 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:
- 50 mu.gifA
- 5 mA
- 500 mu.gifA
- 50 mA
4. What is the resolution of a digital-to-analog converter (DAC)?
- It is the comparison between the actual output of the converter and its expected output.
- It is the deviation between the ideal straight-line output and the actual output of the converter.
- It is the smallest analog output change that can occur as a result of an increment in the digital input.
- It is its ability to resolve between forward and reverse steps when sequenced over its entire range.
5. The practical use of binary-weighted digital-to-analog converters is limited to:
- R/2R ladder D/A converters
- 4-bit D/A converters
- 8-bit D/A converters
- op-amp comparators
6. The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:
- quantization
- accuracy
- resolution
- monotonicity
7. 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:
- 0.6 V
- –0.6 V
- 0.1 V
- –0.1 V
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?
- It only uses two different resistor values.
- It has fewer parts for the same number of inputs.
- Its operation is much easier to analyze.
- The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
9. The resolution of a 0–5 V 6-bit digital-to-analog converter (DAC) is:
- 63%
- 64%
- 1.56%
- 15.6%
10. In a flash analog-to-digital converter, the output of each comparator is connected to an input of a:
- decoder
- priority encoder
- multiplexer
- demultiplexer