Computer Interfacing

Conversion between digital and analogue

circuit actually works (or by practical experiment of

course!). The role of the op-amp in this case is to act as

a unity gain buffer between the converter output and the

analogue controller.

It should be obvious that there is little in either of the

above circuits to limit their speeds. In fact, it is gener-

ally true that digital-to-analogue conversions are virtually

instantaneous and the limitations in the system lie in the

often slow speeds of the analogue-to-digital converters.

Analogue-to-digital converters

There is an interesting variety of circuits for the reverse

process of analogue-to-digital