AD548 Analog Devices, AD548 Datasheet

AD548

Manufacturer Part Number

AD548

Description

Precision/ Low Power BiFET Op Amp

Manufacturer

Analog Devices

Datasheet

1.AD548.pdf (8 pages)

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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.

PRODUCT DESCRIPTION

The AD548 is a low power, precision monolithic operational

amplifier. It offers both low bias current (10 pA max, warmed

up) and low quiescent current (200 A max) and is fabricated

with ion-implanted FET and laser wafer trimming technologies.

Input bias current is guaranteed over the AD548’s entire

common-mode voltage range.

The economical J grade has a maximum guaranteed input offset

voltage of less than 2 mV and an input offset voltage drift of less

than 20 V/ C. The C grade reduces input offset voltage to less

than 0.25 mV and offset voltage drift to less than 2 V/ C. This

level of dc precision is achieved utilizing Analog’s laser wafer

drift trimming process. The combination of low quiescent cur-

rent and low offset voltage drift minimizes changes in input off-

set voltage due to self-heating effects. Four additional grades are

offered over the commercial, industrial and military temperature

ranges.

The AD548 is recommended for any dual supply op amp appli-

cation requiring low power and excellent dc and ac perfor-

mance. In applications such as battery-powered, precision

instrument front ends and CMOS DAC buffers, the AD548’s

excellent combination of low input offset voltage and drift, low

bias current and low 1/f noise reduces output errors. High com-

mon-mode rejection (86 dB, min on the “C” grade) and high

open-loop gain ensures better than 12-bit linearity in high im-

pedance, buffer applications.

The AD548 is pinned out in a standard op amp configuration

and is available in six performance grades. The AD548J and

AD548K are rated over the commercial temperature range of

0 C to +70 C. The AD548A, AD548B and AD548C are rated

FEATURES

Enhanced Replacement for LF441 and TL061

DC Performance:

AC Performance:

Available in Plastic, Hermetic Cerdip and Hermetic

Available in Tape and Reel in Accordance with

MIL-STD-883B Parts Available

Dual Version Available: AD648

Surface Mount (SOIC) Package Available

200 A max Quiescent Current

10 pA max Bias Current, Warmed Up (AD548C)

250 V max Offset Voltage (AD548C)

2 V/ C max Drift (AD548C)

2 V p-p Noise, 0.1 Hz to 10 Hz

1.8 V/ s Slew Rate

1 MHz Unity Gain Bandwidth

Metal Can Packages and in Chip Form

EIA-481A Standard

over the industrial temperature range of –40 C to +85 C. The

AD548S is rated over the military temperature range of –55 C

to +125 C and is available processed to MIL-STD-883B, Rev. C.

The AD548 is available in an 8-pin plastic mini-DIP, cerdip,

TO-99 metal can, surface mount (SOIC), or in chip form.

PRODUCT HIGHLIGHTS

1. A combination of low supply current, excellent dc and ac

2. The AD548 is pin compatible with industry standard op

3. Guaranteed low input offset voltage (2 mV max) and drift

4. Analog Devices specifies each device in the warmed-up con-

5. A dual version, the AD648 is also available.

6. Enhanced replacement for LF441 and TL061.

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

Tel: 617/329-4700

NONINVERTING

OFFSET NULL

performance and low drift makes the AD548 the ideal op

amp for high performance, low power applications.

amps such as the LF441, TL061, and AD542, enabling de-

signers to improve performance while achieving a reduction

in power dissipation of up to 85%.

(20 V/ C max) for the AD548J are achieved utilizing

Analog Devices’ laser drift trimming technology, eliminating

the need for external trimming.

dition, insuring that the device will meet its published specifi-

cations in actual use.

NONINVERTING

OFFSET NULL

INVERTING

NOTE : PIN 4 CONNECTED TO CASE

NC = NO CONNECT

INPUT

V–

TO-99 (H) Package

Plastic Mini-DIP (N) Package,

CONNECTION DIAGRAMS

TOP VIEW

Cerdip (Q) Package and

AD548

Precision, Low Power

V–

SOIC (R)Package

V+

OFFSET

NULL

V+

OUTPUT

OFFSET

NULL

OUTPUT

BiFET Op Amp

TOP VIEW

AD548

10k

Fax: 617/326-8703

TRIM

–15V

Related parts for AD548

AD548 Summary of contents

Page 1

... The AD548 is pinned out in a standard op amp configuration and is available in six performance grades. The AD548J and AD548K are rated over the commercial temperature range +70 C. The AD548A, AD548B and AD548C are rated REV. B Information furnished by Analog Devices is believed to be accurate and reliable ...

Page 2

... AD548J AD548K AD548A AD548B AD548S AD548KR, AD548BR AD548KN AD548BH AD548KR-REEL, AD548BR-REEL = + +25 C. For higher temperature, the current doubles every –2– AD548C Max Min Typ Max 0.5 0.10 0.25 0.7/0.8 0 ...

Page 3

... V Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite Differential Input Voltage . . . . . . . . . . . . . . . . . . +V Storage Temperature Range ( – +150 C ( – +125 C Operating Temperature Range AD548J +70 C AD548A/B – +85 C AD548S . . . . . . . . . . . . . . . . . . . . . . . . . . . – +125 C Lead Temperature Range (Soldering 60 sec +300 C NOTES 1 Stresses above those listed under “ ...

Page 4

... AD548–Typical Characteristics –10 –6 – COMMON-MODE VOLTAGE – V Figure 7. Input Bias Current vs. Common-Mode Voltage 100 100 PHASE GAIN –20 –20 –40 –40 1k 10k 100k 1M 10M FREQUENCY – Hz Figure 10. Open Loop Frequency ...

Page 5

... The common-mode range of the AD548 extends from 3 V more positive than the negative supply more negative than the positive supply. Designed to cleanly drive and 100 pF loads, the AD548 will drive load with reduced open loop gain. OFFSET NULLING Unlike bipolar input amplifiers, zeroing the input offset voltage of a BiFET op amp will not minimize offset drift ...

Page 6

... The oscilloscope photos in Figures 25 and 26 show small and large signal outputs of the circuit in Figure 24. Upper traces show the input signal V . Lower traces are the resulting output IN voltage with the DAC’s digital input set to all 1s. The AD548 settles to 0.01% for input step 20V 100 ...

Page 7

... C noise gain “peaking” at the expense of bandwidth. INSTRUMENTATION AMPLIFIER The AD548C’s maximum input current makes it an excellent building block for the high input impedance instru- mentation amplifier shown in Figure 29. Total current drain for this circuit is under 600 A ...

Page 8

... This circuit ensures a 1% log conformance error over an input current range of 300 mA, with low level accuracy limited by the AD548’s input current. The low level input volt- age accuracy of this circuit is limited by the input offset voltage and drift of the AD548. ...

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