The AD780 is an ultrahigh precision band gap reference voltage
that provides a 2.5 V or 3.0 V output from inputs between 4.0 V
and 36 V. Low initial error and temperature drift combined with
low output noise and the ability to drive any value of capacitance
make the AD780 the ideal choice for enhancing the performance
of high resolution analog-to-digital converters (ADCs) and
digital-to-analog converters (DACs), and for any general-purpose
precision reference application. A unique low headroom design
facilitates a 3.0 V output from a 5.0 V 10% input, providing a
20% boost to the dynamic range of an ADC over performance
with existing 2.5 V references.
The AD780 can be used to source or sink up to 10 mA, and can
be used in series or shunt mode, thus allowing positive or negative
output voltages without external components. This makes it
suitable for virtually any high performance reference application.
Unlike some competing references, the AD780 has no region of
possible instability. The part is stable under all load conditions
when a 1 μF bypass capacitor is used on the supply.
A temperature output pin on the AD780 provides an output
voltage that varies linearly with temperature, allowing the part
to be configured as a temperature transducer while providing a
stable 2.5 V or 3.0 V output.
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