Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition

precision. On the other hand, what if we want to measure the same temperature

range with 0.1



C accuracy? Now we need 100/.1, or 1000 discrete values, and

that means a 10-bit ADC (which can produce 1024 discrete values).

Voltage Precision

The number of bits required to measure our example temperature range is

dependent on the range of what we are measuring (temperature, voltage, light

intensity, pressure, etc.) and not on a specific voltage range. In fact, our 0-to-

100



C range might be converted to a 0-to-5 volt swing or a 0-to-1 volt swing. In

either case, the dynamic range that we have to measure is the same. However, the

0-to-5 V range uses 19.5