AD824

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REV. C

Single Supply, Rail-to-Rail

Low Power, FET-Input Op Amp

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: 500

A/Amp

Wide Bandwidth: 2 MHz

Slew Rate: 2 V/ s

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

GENERAL DESCRIPTION

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

turing 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 Perfor-

mance at 3 V is fully guaranteed.

Fabricated on ADI’s 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 latchup. The output voltage

swings to within 15 mV of the supplies. Capacitive loads to

350 pF can be handled without oscillation.

PIN CONFIGURATIONS

14-Lead Epoxy SOIC

(R Suffix)

1

2

14

13

5

6

7

10

9

8

3

4

12

11

TOP VIEW

(Not to Scale)

AD824

OUT A

–IN A

+IN A

V+

+IN B

–IN B

OUT B

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

16-Lead Epoxy SOIC

(R Suffix)

1

2

3

4

5

6

7

8

14

13

12

11

10

9

15

16

OUT A

–IN A

+IN A

V+

+IN B

–IN B

OUT B

–IN D

+IN D

V–

+IN C

–IN C

OUT C

OUT D

NC

NC

NC = NO CONNECT

AD824

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

and 16-lead SOIC packages.