The output voltage or current of a digital-to-analog converter is truly an analog signal.

More Questions from Interfacing to the Analog World

• The amount of deviation of the measured step size from the ideal step size is a measure of linearity.
• In a digital storage scope, when memory is full, the next data point is lost.
• The current across the MSB "rung" of a 4-bit R/2R ladder DAC if the reference voltage is 5 v and R is 8 Ω is 625 µA.
• A sample-and-hold circuit is used in D/A conversion.
• When the inputs of a four-bit D/A converter are connected to a binary up-counter, the output looks like an upward sloping line.
• A data acquisition system may communicate via two common buses: the data bus and the control bus.
• The output of an analog-to-digital converter is a voltage level.
• When the analog input to a tracking A/D converter is at a constant level, the digital output will oscillate.
• A DAC is monotonic if its output increases as its binary input is incremented from one value to the next.
• To be useful, A/D or D/A converters must have meaningful representation of the analog quantity and a digital representation and the digital quantity as an analog representation.

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