six channel A-D converter

7-94 — elektor july/august 1981 S. Traub six channel A/D converter to convert the input voltage level to a particular pulse duration (pulse width modulation). During the pulse period, a "count" routine in the computer pro- gram is enabled. Thus the binary result at the end of the pulse duration gives an indication of the voltage level being measured. The analogue data inputs to IC1 are represented by the symbols II . . . 16. Any one of these inputs can be selected by means of the logic levels presented to the select inputs (pins 1, 2 and 16). This infor- mation is passed on from the data bus of the micro- tem via the quad D-typ processor sys In their simplest form, electronic measuring instru- ments usually provide an analogue display. In other, words, temperature and pressure values, for instance are expressed as a DC voltage level. Before th information can be further processed, it needs to be translated into a language that a computer can 2 shows what happens to the voltage l...