IndiaBix - Analog and Digital Converters
b
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
b
A binary-weighted digital-to-analog converter has a feedback resistor, Rf, of 12 kΩ. If 50uA 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
a
A binary-weighted digital-to-analog converter has an input resistor of 100kΩ. If the resistor is connected to a 5 V source, the current through the resistor is: A. 50 uA B. 5 mA C. 500 uA D. 50 mA
b
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
c
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/Aconverter staircase waveformduring the conversion process
c
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
b
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
d
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
c
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%
a
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.
c
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.
a
Which is not an analog-to-digital (ADC) conversion error? A. differential nonlinearity B. missing code C. incorrect code D. offset
d
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