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Single Supply, Rail-to-Rail Low Power, FET-Input Op Amp AD824

a 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

PIN CONFIGURATIONS 14-Lead Epoxy DIP (N Suffix)

14-Lead Epoxy SO (R Suffix)

OUT A

1

14 OUT D

OUT A

1

14

OUT D

–IN A

2

13 –IN D

–IN A

2

13

–IN D

+IN A

3

12 +IN D

+IN A

3

12 +IN D

V+

4

V+

4

+IN B

5

10 +IN C

+INB

5

11 TOP VIEW (Not to Scale) 10

–IN B

6

9

–IN C

–INB

6

9

–IN C

OUT B

7

8

OUT C

OUTB

7

8

OUT C

AD824

11 V–

AD824

V– +IN C

TOP VIEW

16-Lead Epoxy SO (R Suffix)

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 volt dual supplies. 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 millivolts 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 300 µV. 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.

16 OUT D

OUT A 1 –IN A

15 –IN D

2

14 +IN D

+IN A 3 V+ 4

AD824

13 V–

+IN B 5

12 +IN C

–IN B

11 –IN C

6

OUT B 7 NC 8

10 OUT C 9

NC

NC = NO CONNECT

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 14-pin DIP and narrow 14-pin and 16-pin SO packages.

REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997


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