Gathering information from the external world
6.1 Analogue-to-digital converters
An analogue-to-digital converter outputs a binary code to represent a voltage which is as near as possible to the applied input analogue voltage. It is one of the fundamental devices which enables a computer to read analogue signals from the external world. There are mainly three types of A/D converters: flash, successive approximation and dual-slope integrating converters. The flash converters offer the highest conversion rate, while the dual-slope converters have the highest conversion accuracy but a slow conversion rate. A good compromise on speed and accuracy is given by the successive approximation converters. The I/O interface between converters and external ...
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