analog-to-digital conversion

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Related to analog-to-digital conversion: A/D converter, A/D conversion

analog-to-digital or A/D conversion,

the process of changing continuously varying data, such as voltage, current, or shaft rotation, into discrete digital quantities that represent the magnitude of the data compared to a standard or reference at the moment the conversion is made. There are two types of converters: electromechanical—also called shaft- or position-to-digital—and electronic. The most common use is to change analog signals into a form that can be manipulated by a digital computercomputer,
device capable of performing a series of arithmetic or logical operations. A computer is distinguished from a calculating machine, such as an electronic calculator, by being able to store a computer program (so that it can repeat its operations and make logical
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, as in data communications; a modemmodem
[modulator/demodulator], an external device or internal electronic circuitry used to transmit and receive digital data over a communications line normally used for analog signals.
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, or data set, is a device that converts the digital signals produced by computers and terminals into analog signals that telephone circuits are designed to carry and then back to digital signals at the other end of the communication link. Similarly, in digital sound recording, audio signals are transformed into digital data, which are then recorded on a magnetic or optical disk or tape; the digitized data on the recording medium then must be changed back into the analog sound signals that can be used by a stereophonic sound system. See also digital-to-analog conversiondigital-to-analog or D/A conversion,
the process of changing discrete digital data into a continuously varying signal in relation to a standard or reference.
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See M. J. Demler, High-Speed Analog-to-Digital Conversion (1991); K. M. Daugherty, Analog-to-Digital Conversion: A Practical Approach (1995).

References in periodicals archive ?
The analog-to-digital conversion is carried out by measuring the time-constant of the RC circuit.
All important functions, such as analog-to-digital conversion, communication, and an excitation source are integrated into a single chip.
The TSL2771 family incorporates an IR LED current-limited driver, analog-to-digital conversion (ADC), interrupt capability, multiple (I.
A chapter on advanced assembly language programming structured around computer arithmetic topics is followed by treatment of fundamental microcontroller interfacing topics such as parallel IO, asynchronous serial IO, synchronous serial IO, interrupt-driven IO, timers, analog-to-digital conversion, and digital-to-analog conversions.
Additionally, with the device's onboard PGA, users can select the gains of x1, x2, x4 or x8 before the analog-to-digital conversion takes place, enabling very high-resolution conversion of even small input signals.
Analog-to-digital conversion to 16-bit resolution takes place on the board itself, to minimize exposure to noise from other circuits in the system.
Up to eight 10-bit Analog-to-Digital Conversion channels
The new AD5933/AD5934 impedance-to-digital converters (IDC) put direct digital synthesis (DDS), analog-to-digital conversion, and DSP on a single chip.
PIC18F4523 Family Removes Cost and Complexity of External ADC in Advanced Sensor Designs That Require Higher-Resolution Analog-to-Digital Conversion