interfacing-to-the-analog-world digital-electronics question and answers -Page 4

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1. One major difference between a counter-ramp A/D converter and a successive-approximation converter is:
Options
A. the counter-ramp A/D converter is much faster than the successive-approximation converter
B. with the successive-approximation converter the final binary result is always slightly less than the equivalent analog input, whereas with the counter-ramp A/D converter it is slightly more
C. with the successive-approximation converter the final binary result is always slightly more than the equivalent analog input, whereas with the counter-ramp A/D converter it is slightly less
D. none of the above

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

3. One disadvantage of the tracking A/D converter is:
Options
A. that it requires two counters?one for up and one for down.
B. that the binary output will oscillate between two binary states when the analog input is constant.
C. the need for an accurate clock reference for the counter.
D. the need for a latch and its associated control circuit.

5. What is the main disadvantage of the counter-ramp A/D converter?
Options
A. It requires a counter.
B. 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.
C. It requires a precision clock in order for the conversion to be reliable.
D. 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. It requires a precision clock in order for the conversion to be reliable.

6. What is the accuracy of a D/A converter?
Options
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.

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

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