REV. C

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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.

a

AD825

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1999

Low Cost, General Purpose

High Speed JFET Amplifier

CONNECTION DIAGRAM

8-Lead Plastic SOIC (R) Package

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

NC = NO CONNECT

AD825

NC

NC

OUTPUT

NC

–IN

+IN

FEATURES

High Speed

41 MHz, –3 dB Bandwidth

125 V/ s Slew Rate

80 ns Settling Time

Input Bias Current of 20 pA and Noise Current of

10 fA/

√Hz

Input Voltage Noise of 12 nV/

√Hz

Fully Specified Power Supplies:

5 V to

15 V

Low Distortion: –76 dB at 1 MHz

High Output Drive Capability

Drives Unlimited Capacitance Load

50 mA Min Output Current

No Phase Reversal When Input Is at Rail

Available in 8-Lead SOIC

APPLICATIONS

CCD

Low Distortion Filters

Mixed Gain Stages

Audio Amplifier

Photo Detector Interface

ADC Input Buffer

DAC Output Buffer

PRODUCT DESCRIPTION

The AD825 is a superbly optimized operational amplifier for

high speed, low cost and dc parameters, making it ideally suited

for a broad range of signal conditioning and data acquisition

applications. The ac performance, gain, bandwidth, slew rate

and drive capability are all very stable over temperature. The

AD825 also maintains stable gain under varying load conditions.

The unique input stage has ultralow input bias current and

ultralow input current noise. Signals that go to either rail on this

high performance input do not cause phase reversals at the output.

These features make the AD825 a good choice as a buffer for

MUX outputs, creating minimal offset and gain errors.

The AD825 is fully specified for operation with dual

±5 V and

±15 V supplies. This power supply flexibility, and the low sup-

ply current of 6.5 mA with excellent ac characteristics under all

supply conditions, makes the AD825 well suited for many

demanding applications.

Figure 1. Performance with Rail-to-Rail Input Signals