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ADC
Posted Date: 27 Apr 2008 Resource Type: Articles/Knowledge Sharing Category: Education
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Posted By: C.Agnes Member Level: Silver
Rating:  Points: 6
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ADC:
Most of the information carrying signals such as voltage, current, charge, temperature, pressure and time are available in the analog form. However, for processing, transmission and storage purposes, it is often more convenient to express such signals in the digital form. When expressed in the digital form, they provide better accuracy and reduce noise.
Moreover, the development in the microcontroller technology has made it compulsory to process data in the digital form. Since digital systems such as microcontroller use a binary system of 1’s and 0’s, we have to convert signal from analog to digital form. The circuit that performs this conversion is called an analog to digital (A/D) converter.
Analog to digital converter are classified into two general groups based on the conversion techniques. One technique involves comparing a given analog signal with the internally generated reference voltages. This group includes successive approximation, flash, delta modulated (DM), adaptive delta modulated and flash type converters. Another technique involves changing an analog signal into time or frequency and comparing these new parameters against known values. This group includes integrator converters and voltage-to-frequency converters.
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