AD704J Analog Devices, AD704J Datasheet

AD704J

Manufacturer Part Number

AD704J

Description

Manufacturer

Analog Devices

Datasheet

1.AD704J.pdf (8 pages)

Specifications of AD704J

Case

SOP

98+

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PRODUCT DESCRIPTION

The AD704 is a quad, low power bipolar op amp that has the

low input bias current of a BiFET amplifier but which offers a

significantly lower I

beta bipolar input transistors to achieve picoampere input bias

current levels (similar to FET input amplifiers at room tempera-

ture), while its I

(unlike a BiFET amp, for which I

in a 1000 increase at +125 C). Furthermore the AD704

achieves 75 V offset voltage and low noise characteristics of a

precision bipolar input op amp.

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.

FEATURES

High DC Precision

Low Noise

Low Power

Chips & MIL-STD-883B Processing Available

Available in Tape and Reel in Accordance

Single Version: AD705, Dual Version: AD706

PRIMARY APPLICATIONS

Industrial/Process Controls

Weigh Scales

ECG/EKG Instrumentation

Low Frequency Active Filters

with EIA-481A Standard

75 V max Offset Voltage

1 V/ C max Offset Voltage Drift

150 pA max Input Bias Current

0.2 pA/ C typical I

0.5 V p-p typical Noise, 0.1 Hz to 10 Hz

600 A max Supply Current per Amplifier

Figure 1. Input Bias Current Over Temperature

0.01

100

0.1

–55

typically only increases by 5 at +125 C

drift over temperature. It utilizes Super-

TEMPERATURE – C

Drift

+25

TYPICAL JFET AMP

doubles every 10 C resulting

AD704T

+125

OUTPUT

14-Pin Cerdip (Q) Packages

Since it has only 1/20 the input bias current of an AD OP07, the

AD704 does not require the commonly used “balancing”

resistor. Furthermore, the current noise is 1/5 that of the

AD OP07 which makes the AD704 usable with much higher

source impedances. At 1/6 the supply current (per amplifier) of

the AD OP07, the AD704 is better suited for today’s higher

density circuit boards and battery powered applications.

The AD704 is an excellent choice for use in low frequency

active filters in 12- and 14-bit data acquisition systems, in

precision instrumentation, and as a high quality integrator. The

AD704 is internally compensated for unity gain and is available

in five performance grades. The AD704J and AD704K are rated

over the commercial temperature range of 0 C to +70 C. The

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

Tel: 617/329-4700

Quad Picoampere Input Current

AD704A and AD704B are rated over the industrial temperature

of –40 C to +85 C. The AD704T is rated over the military

temperature range of –55 C to +125 C and is available

processed to MIL-STD-883B, Rev. C.

–IN

14-Pin Plastic DIP (N)

AD704

(TOP VIEW)

+IN2

+IN1

CONNECTION DIAGRAMS

AMP 2

AMP 1

OUTPUT

–IN

–V

–IN

OUTPUT

(E) Package

AD704

AMP 4

AMP 3

OUTPUT

Bipolar Op Amp

–IN

20-Terminal LCC

NC = NO CONNECT

16-Pin SOIC

(R) Package

+IN3

+IN4

–V

AD704

(TOP VIEW)

AD704

Fax: 617/326-8703

OUTPUT

–V

–IN

OUTPUT

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