A to D and D to A conversions
2.5.1 Interfacing
Interfacing to a microcomputer is the process whereby the physical phenomenon to be measured is converted into an analog electrical signal by a transducer. The signal is then digitised by an analog to digital converter (ADC) and then stored in memory.
The ADC can be located either near the transducer, or, as is more common, on a special purpose interface card installed inside the microcomputer. The interface card interfaces directly to memory either by DMA or as a memory-mapped device.
When a digital number is to be displayed on some external device, it is converted into an analog electrical ...
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