Book Analog Interfacing to Embedded Microprocessors
is typically specified in db.
The output offset is the voltage difference between the input and the output.
S/H datasheets typically show a hold mode offset and sample mode offset, in
millivolts.
Real Parts
Real ADC ICs come with a few real-world limitations and some added features.
Input Levels
The examples so far have concentrated on ADCs with a 0–5V input range.
This is a common range for real ADCs, but many of them operate over a wider
range of voltages. The Analog Devices AD570 has a 10v input range. The part
Digital-to-Analog Converters 29
can be configured so that this 10v range is either 0 to 10v or -5v to +5v, using
one pin. Of course, the device needs a negative voltage supply. Other common
input voltage ranges are ±2.5v and ±3v.
With the trend toward lower-powered devices and small consumer equip-
ment, the trend in ADC devices is to lower voltage, single-supply operation.
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