Analog and Digital Converters

Q1: 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%

Q2: The primary disadvantage of the flash analog-to digital converter (ADC) is that:

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

Q3: 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

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.

Q5: 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

Q6: 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

Q7: 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

Q8: Sample-and-hold circuits in analog-to digital converters (ADCs) are designed to:

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

Q9: 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

Q10: Which is not an analog-to-digital (ADC) conversion error?

A
differential nonlinearity

B
missing code

C
incorrect code

D
offset

Q11: 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

Q12: 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

Q13: 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.


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