ANALOG TO DIGITAL CONVERTERS

May 14th, 2015
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The heart of the computer-based data acquisition is usually the analog to digital converter (ADC). Basically this device is a voltmeter. Its input is voltage and its output is a digital number (a collection of 0's and 1's) proportional to the input voltage.

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ADCSANALOG TO DIGITAL CONVERTERSThe heart ofADCSANALOG TO DIGITAL CONVERTERSThe heart of the computer-based data acquisition is usually the analog to digital converter (ADC). Basically this device is a voltmeter. Its input is voltage and its output is a digital number (a collection of 0's and 1's) proportional to the input voltage. The computer is usually programmed to convert this outputted digital number into a number that is represents the measured voltage. Consider, for example, ADC designed to measure between 0 and 10 volts and convert this measurement into an 8-bit digital number. Then a 0 volt input is associated with the digital output of 0 (in binary 0000 0000) and a 9.999 volt input is associated with the digital output of 255 ( in binary 1111 1111). In general the digital output of the ADC is related to the input voltage by the algorithm:In this example if the input voltage was 4.78231415 volts then the ADC would produce the number 122 as its output. The computer program would then take this number and relate it with a voltage using the equation:For this example this final conversion yields 4.78. Note that because the input was converted to an 8-bit integer

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