AD/DA conversion

Which is a characteristic of a resistor-string DAC, which connects many resistors in series?

  1. AIts output is structurally guaranteed to change monotonically with the input code
  2. BIt is always the fastest
  3. CIt uses only two resistor values
Show answer and explanation

Answer: A. Its output is structurally guaranteed to change monotonically with the input code

A resistor-string DAC selects, with switches, the tap of the series resistor chain that corresponds to the input code. When the code increases by 1, the next higher tap is always selected, so the output always increases monotonically. As bits increase, the number of resistors and switches grows to 2ⁿ.

Practice this topic Back to topic

More AD/DA conversion questions

  1. Which AD converter architecture is classified as oversampling?
  2. What does an AD converter (ADC) do?
  3. Which is the most appropriate example of where a DA converter (DAC) is used?
  4. For AD converters with the same input range, what happens when the resolution (number of bits) is increased?
  5. Which correctly describes "sampling" in AD conversion?