Until not so long ago, only 8-bit analogue-to-digital
converters (ADC) offered an I²C™ interface.
Unfortunately, a resolution of 256 samples is
inadequate for a number of measurements. The
12-bit ADC described in this short article has a
resolution×16 or even ×64 as high. This makes
it a lot more convenient to read, say, the usual
temperature sensors, such as the LM335, which
output 10 mV °C–1. With a 12-bit ADC and an
internal reference voltage of 4.096 V, the resolution
is 1 mV, which means that the sensor reading
can be read in 0.1 °C. With an 8-bit converter,
the resolution would be only 1.6 °C.
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