AD705BQ datasheet, PDF - EEWORLD Datasheet

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AD705BQ: DescriptionPicoampere Input Current Bipolar Op Amp; File Size367KB，8 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD705BQ Overview

Picoampere Input Current Bipolar Op Amp

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FEATURES

DC PERFORMANCE

25 V max Offset Voltage (AD705T)

0.6 V/ C max Drift (AD705K/T)

100 pA max Input Bias Current (AD705K)

600 pA max I

Over MIL Temperature Range (AD705T)

114 dB min CMRR (AD705K/T)

114 dB min PSRR (AD705T)

200 V/mV min Open Loop Gain

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

600 A max Supply Current

AC PERFORMANCE

0.15 V/µs Slew Rate

800 kHz Unity Gain Crossover Frequency

10,000 pF Capacitive Load Drive Capability

Low Cost

Available in 8-Pin Plastic Mini-DlP, Hermetic Cerdip

and Surface Mount (SOIC) Packages

MIL-STD-883B Processing Available

Dual Version Available: AD706

Quad Version: AD704

APPLICATIONS

Low Frequency Active Filters

Precision Instrumentation

Precision Integrators

Picoampere Input Current

Bipolar Op Amp

AD705

CONNECTION DIAGRAM

Plastic Mini-DIP (N)

Cerdip (Q) and

Plastic SOIC (R) Packages

OFFSET

NULL

–IN

+IN

V–

TOP VIEW

OFFSET

NULL

V+

OUTPUT

OVER

COMP

AD705

levels, the commonly used “balancing” resistor (connected be-

tween the noninverting input of a bipolar op amp and ground) is

not required.

The AD705 is an excellent choice for use in low frequency ac-

tive filters in 12- and 14-bit data acquisition systems, in preci-

sion instrumentation and as a high quality integrator.

The AD705 is internally compensated for unity gain and is

available in five performance grades. The AD705J and AD705K

are rated over the commercial temperature range of 0°C to

+70°C. The AD705A and AD705B are rated over the industrial

temperature range of –40°C to +85°C. The AD705T is rated

over the military temperature range of –55°C to +125°C and is

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

The AD705 is offered in three varieties of 8-pin package: plastic

DIP, hermetic cerdip and surface mount (SOIC). “J” grade

chips are also available.

PRODUCT HIGHLIGHTS

PRODUCT DESCRIPTION

The AD705 is a low power bipolar op amp that has the low in-

put bias current of a BiFET amplifier but which offers a signifi-

cantly lower I

drift over temperature. The AD705 offers many

of the advantages of BiFET and bipolar op amps without their

inherent disadvantages. It utilizes superbeta bipolar input tran-

sistors to achieve the picoampere input bias current levels of

FET input amplifiers (at room temperature), while its I

typi-

cally only increases 5 times vs. BiFET amplifiers which exhibit a

1000X increase over temperature. This means that, at room

temperature, while a typical BiFET may have less I

than the

AD705, the BiFET’s input current will increase to a level of

several nA at +125°C. Superbeta bipolar technology also per-

mits the AD705 to achieve the microvolt offset voltage and low

noise characteristics of a precision bipolar input amplifier.

The AD705 is a high quality replacement for the industry-

standard OP07 amplifier while drawing only one sixth of its

power supply current. Since it has only 1/20th the input bias

current of an OP07, the AD705 can be used with much higher

source impedances, while providing the same level of dc preci-

sion. In addition, since the input bias currents are at picoAmp

REV. B

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.

1. The AD705 is a low drift op amp that offers BiFET level

input bias currents, yet has the low I

drift of a bipolar ampli-

fier. It upgrades the performance of circuits using op amps

such as the LT1012.

2. The combination of Analog Devices’ advanced superbeta

processing technology and factory trimming provides both

low drift and high dc precision.

3. The AD705 can be used in applications where a chopper am-

plifier would normally be required but without the chopper’s

inherent noise and other problems.

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

Tel: 617/329-4700

Fax: 617/326-8703

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