AD705AQ AD [Analog Devices], AD705AQ Datasheet

AD705AQ

Manufacturer Part Number

AD705AQ

Description

Picoampere Input Current Bipolar Op Amp

Manufacturer

AD [Analog Devices]

Datasheet

1.AD705AQ.pdf (8 pages)

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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

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

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

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.

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

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/ s 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

MIL-STD-883B Processing Available

Dual Version Available: AD706

Quad Version: AD704

APPLICATIONS

Low Frequency Active Filters

Precision Instrumentation

Precision Integrators

and Surface Mount (SOIC) Packages

drift over temperature. The AD705 offers many

Over MIL Temperature Range (AD705T)

than the

typi-

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

PRODUCT HIGHLIGHTS

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

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.

2. The combination of Analog Devices’ advanced superbeta

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

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

Tel: 617/329-4700

input bias currents, yet has the low I

fier. It upgrades the performance of circuits using op amps

such as the LT1012.

processing technology and factory trimming provides both

low drift and high dc precision.

plifier would normally be required but without the chopper’s

inherent noise and other problems.

Picoampere Input Current

OFFSET

CONNECTION DIAGRAM

Plastic SOIC (R) Packages

NULL

+IN

–IN

Plastic Mini-DIP (N)

V–

Cerdip (Q) and

TOP VIEW

AD705

Bipolar Op Amp

drift of a bipolar ampli-

OFFSET

NULL

V+

OUTPUT

OVER

COMP

AD705

Fax: 617/326-8703

Related parts for AD705AQ

AD705AQ Summary of contents

Page 1

FEATURES DC PERFORMANCE 25 V max Offset Voltage (AD705T) 0 max Drift (AD705K/T) 100 pA max Input Bias Current (AD705K) 600 pA max I Over MIL Temperature Range (AD705T) B 114 dB min CMRR (AD705K/T) 114 dB ...

Page 2

AD705–SPECIFICATIONS Parameter Conditions INPUT OFFSET VOLTAGE Initial Offset Offset MIN vs. Temp, Average TC vs. Supply (PSRR 2 MIN MAX ...

Page 3

... REV. B AD705J/A AD705K/B Min Typ Max Min Typ AD705AQ AD705BQ AD705JN AD705KN AD705JR AD705JCHIPS 45 45 ABSOLUTE MAXIMUM RATINGS Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 4

AD705–Typical Characteristics 100 SAMPLE SIZE: 610 – 80 –60 – 40 – +60 +80 INPUT OFFSET VOLTAGE – Microvolts Figure 1. Typical Distribution of Input Offset Voltage +V S ...

Page 5

FREQUENCY – Hz Figure 10. Input Noise Voltage Spectral Density 500 450 400 +125 C +25 C 350 +55 C 300 SUPPLY VOLTAGE – Volts Figure 13. ...

Page 6

AD705 1 GAIN BANDWIDTH 0.1 SLEW RATE 0.01 ADDING AN EXTERNAL CAPACITOR BETWEEN PIN 5 AND GROUND INCREASES THE AMPLIFIER'S COMPENSATION 0.001 1 10 100 1000 10,000 VALUE OF OVERCOMPENSATION CAPACITOR – pF Figure 19. Slew Rate & Gain Bandwidth ...

Page 7

Figure 22d. Unity Gain Inverter Small Signal Pulse Response C, = 1000 pF * 10pF 10k +V S 0.1µF SQUARE WAVE 7 INPUT 2 AD705 –V 0.1µF S ...

Page 8

AD705 A 1 Hz, 2-Pole, Active Filter Table II gives recommended component values for the 1 Hz fil- ter of Figure 26. An unusual characteristic of the AD705 is that both the input bias current and the input offset current ...

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