Analog Devices AD548 Datasheet

Precision, Low Power

a

FEATURES
Enhanced Replacement for LF441 and TL061
DC Performance:

200 mA max Quiescent Current
10 pA max Bias Current, Warmed Up (AD548C)
250 mV max Offset Voltage (AD548C)
2 mV/8C max Drift (AD548C)
2 mV p-p Noise, 0.1 Hz to 10 Hz

AC Performance:

1.8 V/ms Slew Rate
1 MHz Unity Gain Bandwidth

Available in Plastic, Hermetic Cerdip and Hermetic

Metal Can Packages and in Chip Form

Available in Tape and Reel in Accordance with

EIA-481A Standard
MIL-STD-883B Parts Available
Dual Version Available: AD648
Surface Mount (SOIC) Package Available

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 µA 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 µV/°C. The C grade reduces input offset voltage to less
than 0.25 mV and offset voltage drift to less than 2 µV/°C. This
level of dc precision is achieved utilizing Analog’s laser wafer
drift trimming process. The combination of low quiescent cur­rent and low offset voltage drift minimizes changes in input off­set 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 appli­cation requiring low power and excellent dc and ac perfor­mance. 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 com­mon-mode rejection (86 dB, min on the “C” grade) and high
open-loop gain ensures better than 12-bit linearity in high im­pedance, 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

BiFET Op Amp

AD548

CONNECTION DIAGRAMS

Plastic Mini-DIP (N) Package,

Cerdip (Q) Package and

SOIC (R)Package

OFFSET NULL

INVERTING

NONINVERTING

OFFSET NULL

INVERTING

INPUT

NONINVERTING

NOTE : PIN 4 CONNECTED TO CASE
NC = NO CONNECT

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
performance and low drift makes the AD548 the ideal op
amp for high performance, low power applications.

2. The AD548 is pin compatible with industry standard op
amps such as the LF441, TL061, and AD542, enabling de­signers to improve performance while achieving a reduction
in power dissipation of up to 85%.

3. Guaranteed low input offset voltage (2 mV max) and drift
(20 µV/°C max) for the AD548J are achieved utilizing
Analog Devices’ laser drift trimming technology, eliminating
the need for external trimming.

4. Analog Devices specifies each device in the warmed-up con­dition, insuring that the device will meet its published specifi­cations in actual use.

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

6. Enhanced replacement for LF441 and TL061.

1
2

INPUT

3

INPUT

4

V–

AD548

TOP VIEW

TO-99 (H) Package

NC

8

1

AD548

2

3

INPUT

4

V–

8
7
6

5

V+

7

6

5

OFFSET
NULL

NC
V+

OUTPUT
OFFSET

NULL

OUTPUT

1

10kΩ

VOS TRIM
TOP VIEW

5

–15V

4

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] Fax: [phone]

AD548–SPECIFICA TIONS

(@ +258C and VS = 615 V dc unless otherwise noted)

Model AD548J/A/S AD548K/B AD548C

Min Typ Max Min Typ Max Min Typ Max Units

INPUT OFFSET VOLTAGE

1

Initial Offset 0.75 2.0 0.3 0.5 0.10 0.25 mV
T

to T

MIN

vs. Temperature 20 5 2.0 µV/°C

MAX

3.0/3.0/3.0 0.7/0.8 0.4 mV

vs. Supply 80 86 86 dB

vs. Supply, T

Long-Term Offset Stability 15 15 15 µV/Month

MIN

to T

MAX

76/76/76 80 80 dB

INPUT BIAS CURRENT

Either Input2, VCM = 0 5 20 3 10 3 10 pA
Either Input2 at T
Max Input Bias Current Over

, VCM = 0 0.45/1.3/20 0.25/0.65 0.65 nA

MAX

Common-Mode Voltage Range 30 15 15 pA
Offset Current, VCM = 0 510 25 25pA
Offset Current at T

MAX

0.25/0.65/10 0.15/0.35 0.35 nA

INPUT IMPEDANCE

Differential 1 × 1012i31 × 1012i31 × 1012i3 ΩipF
Common Mode 3 × 1012i33 × 1012i33 × 1012i3 ΩipF

INPUT VOLTAGE RANGE

Differential

3

± 20 ± 20 ± 20 V
Common Mode ± 11 ± 12 ± 11 ±12 ± 11 ±12 V
Common-Mode Rejection

VCM = ±10 V 76 90 82 92 86 98 dB

T

to T

MIN

MIN

to T

MAX

MAX

VCM = ±11 V 70 84 76 86 76 90 dB

T

76/76/76 90 82 92 86 98 dB
70/70/70 84 76 86 76 90 dB

INPUT VOLTAGE NOISE

Voltage 0.1 Hz to 10 Hz 2 2 2 4.0 µV p-p

f = 10 Hz 80 80 80 nV/√Hz
f = 100 Hz 40 40 40 nV/√Hz
f = 1 kHz 30 30 30 nV/√Hz
f = 10 kHz 30 30 30 nV/√Hz

INPUT CURRENT NOISE

f = 1 kHz 1.8 1.8 1.8 fA/√Hz

FREQUENCY RESPONSE

Unity Gain, Small Signal 0.8 1.0 0.8 1.0 0.8 1.0 MHz
Full Power Response 30 30 30 kHz
Slew Rate, Unity Gain 1.0 1.8 1.0 1.8 1.0 1.8 V/µs
Settling Time to ±0.01% 8 8 8 µs

OPEN LOOP GAIN

VO = ±10 V, RL ≥ 10 kΩ 300 1000 300 1000 300 1000 V/mV
T

to T

MIN

VO = ±10 V, RL ≥ 5 kΩ 150 500 150 500 150 500 V/mV
T

MIN

, RL ≥ 10 kΩ 300/300/300 700 300 700 300 700 V/mV

MAX

to T

, RL ≥ 5 kΩ 150/150/150 300 150 300 150 300 V/mV

MAX

OUTPUT CHARACTERISTICS

Voltage @ RL ≥ 10 kΩ, ±12 ±13 ±12 ±13 ±12 ± 13 V

T

to T

MIN

MIN

to T

MAX

MAX

Voltage @ RL ≥ 5 kΩ, ±11 ± 12.3 ±11 ±12.3 ±11 ± 12.3 V

T

Short Circuit Current 15 15 15 mA

±12/±12/±12 ±12 ± 12
±11/±11/±11 ±11 ± 11

POWER SUPPLY

Rated Performance ± 15 ± 15 ±15 V
Operating Range ± 4.5 ±18 ± 4.5 ±18 ± 4.5 ± 18 V
Quiescent Current 170 200 170 200 170 200 µA

TEMPERATURE RANGE

Operating, Rated Performance

Commercial (0°C to +70°C) AD548J AD548K
Industrial (–40°C to +85°C) AD548A AD548B AD548C
Military (–55°C to +125°C) AD548S

PACKAGE OPTIONS

SOIC (R-8) AD548JR AD548KR, AD548BR
Plastic (N-8) AD548JN AD548KN
Cerdip (Q-8) AD548AQ
Metal Can (H-08A) AD548AH AD548BH

AD548CQ

Tape and Reel AD548JR-REEL AD548KR-REEL, AD548BR-REEL
Chips Available AD548JCHIPS

NOTES

1

Input Offset Voltage specifications are guaranteed after 5 minutes of operation at TA = +25°C.

2

Bias Current specifications are guaranteed maximum at either input after 5 minutes of operation at TA = +25°C. For higher temperature, the current doubles every 10°C.

3

Defined as voltages between inputs, such that neither exceeds ±10 V from ground.

Specifications subject to change without notice.

–2–

REV. C

AD548

WARNING!

ESD SENSITIVE DEVICE

LOAD RESISTANCE – Ω

30

25

20

10

0

10 100 1k 10k

5

15

OUTPUT VOLTAGE SWING – Volts p-p

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V

Internal Power Dissipation
Input Voltage

3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V

2

. . . . . . . . . . . . . . . . . . . .500 mW

l

Output Short Circuit Duration . . . . . . . . . . . . . . . . .Indefinite

Differential Input Voltage . . . . . . . . . . . . . . . . . . +V

and –V

S

S

Storage Temperature Range (Q, H) . . . . . . . .–65°C to +150°C

(N, R) . . . . . . . .–65°C to +125°C

Operating Temperature Range

AD548J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . .0°C to +70°C

AD548A/B/C . . . . . . . . . . . . . . . . . . . . . . . .–40°C to +85°C

AD548S . . . . . . . . . . . . . . . . . . . . . . . . . . .–55°C to +125°C

Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C

NOTES

1

Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the
operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.

2

Thermal Characteristics: 8-Pin SOIC Package: θJA = 160°C/W, θ
8-Pin Plastic Package: θJA = 90°C/W; 8-Pin Cerdip Package: θJC = 22°C/W, θJA =
110°C/W; 8-Pin Metal Can Package: θJC = 65°C/W, θJA = 150°C/W.

3

For supply voltages less than ±18 V, the absolute maximum input voltage is equal
to the supply voltage.

20

15

+V

IN

10

–V

IN

INPUT VOLTAGE – ±V

5

= 42°C/W;

JC

20

15

10

5

OUTPUT VOLTAGE SWING – ±V

METALIZATION PHOTOGRAPH

Dimensions shown in inches and (mm).

Contact factory for latest dimensions

Typical Characteristics

+V

OUT

–V

OUT

25°C
R

= 10k

L

0

0 5 10 15 20

SUPPLY VOLTAGE – ±V

Figure 1. Input Voltage Range
vs. Supply Voltage

200

180

160

140

QUIESCENT CURRENT – µA

120

0 5 10 15 20

SUPPLY VOLTAGE – ±V

Figure 4. Quiescent Current vs.
Supply Voltage

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD548 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

REV. C

0

0 5 10 15 20

SUPPLY VOLTAGE – ±V

Figure 2. Output Voltage Swing
vs. Supply Voltage

10

8

6

4

INPUT BIAS CURRENT – pA

2

0

0 4 8 12 16 20

SUPPLY VOLTAGE – ±V

Figure 5. Input Bias Current
vs. Supply Voltage

–3–

Figure 3. Output Voltage Swing
vs. Load Resistance

100nA

10nA

1nA

100pA

10pA

1pA

INPUT BIAS CURRENT

100fA

10fA

–55 –25 5 35 65 95 125

TEMPERATURE – °C

Figure 6. Input Bias Current vs.
Temperature