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Analogtodigital converter
An analogtodigital converter (abbreviated ADC, A/D or A to D) is an electronic integrated circuit that converts a continuous quantity to a discrete time digital number. An ADC may also provide an isolated measurement. The reverse operation is performed by a digitaltoanalog converter (DAC).
Typically, an ADC is an electronic device that converts an input analog voltage or current to a digital number. The size of the number grows with an increase in the input voltage or current. However, some nonelectronic or only partially electronic devices, such as rotary encoders, can also be considered ADCs.
References
 Allen, Phillip E.; Holberg, Douglas R., CMOS Analog Circuit Design,
 Kester, Walt, ed. (2005), The Data Conversion Handbook, Elsevier: Newnes,
, http://www.analog.com/library/analogDialogue/archives/3906/data_conversion_handbook.html
 Johns, David; Martin, Ken, Analog Integrated Circuit Design,
 Knoll, Glenn F. (1989), Radiation Detection and Measurement (2nd ed.), New York: John Wiley & Sons, pp. 665–666
 Liu, Mingliang, Demystifying SwitchedCapacitor Circuits,
 Nicholson, P. W. (1974), Nuclear Electronics, New York: John Wiley & Sons, pp. 315–316
 Norsworthy, Steven R.; Schreier, Richard; Temes, Gabor C. (1997), DeltaSigma Data Converters, IEEE Press,
 Razavi, Behzad (1995), Principles of Data Conversion System Design, New York, NY: IEEE Press,
 Staller, Len (February 24, 2005), "Understanding analog to digital converter specifications", Embedded Systems Design, http://www.embedded.com/showArticle.jhtml?articleID=60403334
 Walden, R. H. (1999), "Analogtodigital converter survey and analysis", IEEE Journal on Selected Areas in Communications 17 (4): 539–550,
, , http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=761034
More websites
The English Wikibooks has more information on: 
 Counting Type ADC A simple tutorial showing how to build your first ADC.
 An Introduction to Delta Sigma Converters A very nice overview of DeltaSigma converter theory.
 Digital Dynamic Analysis of A/D Conversion Systems through Evaluation Software based on FFT/DFT Analysis RF Expo East, 1987
 Which ADC Architecture Is Right for Your Application? article by Walt Kester
 AN71  The Care and Feeding of High Performance ADCs Real world circuit and layout advice
 ADC and DAC Glossary Defines commonly used technical terms.
 Signal processing and system aspects of timeinterleaved ADCs.
 Introduction to ADC in AVR  Analog to digital conversion with Atmel microcontrollers
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[[Category:Electronic circuits

