40 TOP ANALOG and DIGITAL CONVERTERS Online Test – Questions and Answers 1. Which of the following is a type of error associated with digital-to-analog converters (DACs)? nonmonotonic and offset error incorrect output codes offset error nonmonotonic error 2. The resolution of a 0–5 V 6-bit digital-to-analog converter (DAC) is: 1.56% 63% 64% 15.6% 3. The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the: accuracy resolution monotonicity quantization 4. 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? The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot It has fewer parts for the same number of inputs It only uses two different resistor values Its operation is much easier to analyze 5. Sample-and-hold circuits in analog-to digital converters (ADCs) are designed to: sample and hold the D/A converter staircase waveform during the conversion process stabilize the comparator’s threshold voltage during the conversion process sample and hold the output of the binary counter during the conversion process stabilize the input analog signal during the conversion process 6. In a flash analog-to-digital converter, the output of each comparator is connected to an input of a: decoder demultiplexer priority encoder multiplexer 7. Which is not an analog-to-digital (ADC) conversion error? offset differential nonlinearity incorrect code missing code 8. 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 9. The primary disadvantage of the flash analog-to digital converter (ADC) is that: a long conversion time is required a large number of output lines is required to simultaneously decode the input voltage a large number of comparators is required to represent a reasonable sized binary number it requires the input voltage to be applied to the inputs simultaneously 10. 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 –3.125 V 0.78125 V 0.3125 V 3.125 V Loading … Question 1 of 10
