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GENERAL DESCRIPTION

The AD824 is a quad, FET input, single supply amplifier,

featuring rail-to-rail outputs. The combination of FET inputs

and rail-to-rail outputs makes the AD824 useful in a wide

variety of low voltage applications where low input current is

a primary consideration.

The AD824 is guaranteed to operate from a 3 V single supply

up to ±15 V dual supplies. AD824AR-3V parametric

performance at 3 V is fully guaranteed.

Fabricated on Analog Devices, Inc., complementary bipolar

process, the AD824 has a unique input stage that allows the

input voltage to safely extend beyond the negative supply and

to the positive supply without any phase inversion or latch-up.

The output voltage swings to within 15 mV of the supplies.

Capacitive loads to 350 pF can be handled without oscillation.

The FET input combined with laser trimming provides an input

that has extremely low bias currents with guaranteed offsets

below 1 mV. This enables high accuracy designs even with high

source impedances. Precision is combined with low noise,

making the AD824 ideal for use in battery powered medical

equipment.

Applications for the AD824 include portable medical

equipment, photo diode preamplifiers, and high impedance

transducer amplifiers.

The ability of the output to swing rail-to-rail enables designers

to build multistage filters in single supply systems and maintain

high signal-to-noise ratios.

The AD824 is specified over the extended industrial (?40°C to

+85°C) temperature range and is available in narrow 14-lead SOIC package.

FEATURES

Single supply operation: 3 V to 30 V

Very low input bias current: 2 pA

Wide input voltage range

Rail-to-rail output swing

Low supply current per amplifier: 500 μA

Wide bandwidth: 2 MHz

Slew rate: 2 V/μs

No phase reversal

APPLICATIONS

Photo diode preamplifier

Battery powered instrumentation

Power supply control and protection

Medical instrumentation

Remote sensors

Low voltage strain gage amplifiers

DAC output amplifier