Interfacing to the Analog World - General Questions (3)

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Interfacing to the Analog World - General Questions

17.

What is the acquisition time of the AD1154 sample-and-hold IC?

A.	1.5
B.	2.5
C.	3.5
D.	4.5

Answer: Option C

Explanation:

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18.

Referring to the given figure, what should the display on the scope look like if the A/D converter is working properly?

mcq11_1019_1

A.	It should be a circular Lissajous pattern resulting from the simultaneous application of ramps to the vertical and horizontal inputs of the oscilloscope.
B.	The pattern should be a straight line across the screen due to the equal but opposite voltages being applied to the scope inputs.
C.	A uniform stairstep pattern should be displayed.
D.	The scope should display a sequential binary count with the LSB on the left and the MSB on the right side of the display.

Answer: Option C

Explanation:

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19.

What is the linearity 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 D

Explanation:

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20.

What is the purpose of a sample-and-hold circuit?

A.	To keep temporary memory
B.	To hold a voltage constant so an ADC has time to produce an output
C.	To hold a voltage constant so a DAC has time to produce an output
D.	To hold data after a multiplexer has selected an output

Answer: Option B

Explanation:

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21.

What is the main disadvantage of the stairstep-ramp A/D converter?

A.	The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage.
B.	It requires a counter.
C.	It requires a precision clock in order for the conversion to be reliable.
D.	All of the above

Answer: Option A

Explanation:

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22.

What is the major advantage of the R/2R ladder D/A converter as compared to a binary-weighted D/A converter?

A.	It has fewer parts for the same number of inputs.
B.	It is much easier to analyze its operation.
C.	It uses only two different resistor values.
D.	The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.

Answer: Option C

Explanation:

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23.

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

Explanation:

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24.

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

Explanation:

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Interfacing to the Analog World - General Questions (3)

Interfacing to the Analog World - General Questions

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