AD548AH Analog Devices Inc, AD548AH Datasheet

AD548AH

Manufacturer Part Number

AD548AH

Description

Manufacturer

Analog Devices Inc

Datasheet

1.AD548AH.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 AD548AH

AD548AH Summary of contents

Page 1

... 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. 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 ...

Page 2

... Military (– +125 C) PACKAGE OPTIONS SOIC (R-8) AD548JR Plastic (N-8) AD548JN Cerdip (Q-8) AD548AQ Metal Can (H-08A) AD548AH Tape and Reel AD548JR-REEL Chips Available AD548JCHIPS NOTES 1 Input Offset Voltage specifications are guaranteed after 5 minutes of operation Bias Current specifications are guaranteed maximum at either input after 5 minutes of operation Defined as voltages between inputs, such that neither exceeds 10 V from ground ...

Page 3

ABSOLUTE MAXIMUM RATINGS Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 ...

Page 4

AD548–Typical Characteristics –10 –6 – COMMON-MODE VOLTAGE – V Figure 7. Input Bias Current vs. Common-Mode Voltage 100 100 PHASE GAIN ...

Page 5

Figure 19a. Unity Gain Follower Figure 20a. Utility Gain Inverter APPLICATION NOTES The AD548 is a JFET-input op amp with a guaranteed maxi- mum I of less than 10 pA, and offset and drift laser-trimmed to B 0.25 mV and ...

Page 6

AD548 Figure 22. Board Layout for Guarding Inputs INPUT PROTECTION The AD548 is guaranteed to withstand input voltages equal to the power supply potential. Exceeding the negative supply volt- age on either input will forward bias the substrate junction of ...

Page 7

PHOTODIODE PREAMP The performance of the photodiode preamp shown in Figure 27 is enhanced by the AD548’s low input current, input voltage offset and offset voltage drift. The photodiode sources a current proportional to the incident light power on its ...

Page 8

AD548 Figure 30. Log Ratio Amplifier compensation is provided by resistors R8 and R15, which have a positive 3500 ppm/ C temperature coefficient. The transfer function for the output voltage is log (I OUT 10 2 Frequency compensation ...

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