Precision Measurement Engineering, Inc.

Discussing the Hardware

A/D CONVERTER

The A/D converter is a 20K sample/second, 16 bit circuit block. It maps the analog voltage range of +/- 3.000 volts onto the integer range +32768 to -32767 according to the approximate equation

Nad = Vad/Vref * 32768

where

Nad - A/D digital output

Vad - A/D input analog voltage

Vref - reference voltage (+3.000 volts)