What converts voltage to digital data?

• A. ADC
• B. DAC
• C. Photomultiplier
• D. Multimeter

Answer: (A)

Converting a voltage signal into digital data is done by an Analog-to-Digital Converter. It samples the continuous voltage at regular intervals and quantizes those samples into discrete digital values, producing binary data that a digital system can store and process. This is fundamental for turning real-world, varying signals into something a computer or microcontroller can work with. In contrast, a digital-to-analog converter does the opposite, turning digital values back into an analog voltage. A photomultiplier detects light and converts it into an electrical signal, often amplified, but not directly into digital data. A multimeter measures electrical quantities and displays a reading, but it doesn’t continuously convert the signal into digital data for processing. So the device that turns voltage into digital data is the Analog-to-Digital Converter.