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FEATURES
Enhanced Replacement for LF441 and TL061
DC Performance:
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
AC Performance:
1.8 V/ s Slew Rate
1 MHz Unity Gain Bandwidth
Available in Plastic 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
Precision, Low Power
BiFET Op Amp
AD548
CONNECTION DIAGRAMS
Plastic Mini-DIP (N) Package
and
SOIC (R)Package
OFFSET NULL 1
INVERTING 2
INPUT
NONINVERTING 3
INPUT
V– 4
8 NC
7 V+
6 OUTPUT
AD548
TOP VIEW
5 OFFSET
NULL
NOTE: PIN 4 CONNECTED TO CASE
NC = NO CONNECT
10k
1
5
4
–15V
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.
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.
The AD548 is recommended for any dual supply op amp applica-
tion 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 com-
bination of low input offset voltage and drift, low bias current,
and low 1/f noise reduces output errors. High common-mode
rejection (82 dB, min on the “B” 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 three performance grades. The AD548J and
AD548K are rated over the commercial temperature range of
0°C to 70°C. The AD548B is rated over the industrial tempera-
ture range of –40°C to +85°C.
The AD548 is available in an 8-lead plastic mini-DIP and
surface-mount (SOIC) packages.
REV. D
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
V
OS
TRIM
TOP VIEW
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002
AD548–SPECIFICATIONS
(@ 25 C and V =
S
15 V dc unless otherwise noted.)
Min
AD548K/B
Typ
0.3
Max
0.5
0.7/0.8
5
Unit
mV
mV
µV/°C
dB
dB
µV/Month
pA
nA
pA
pA
nA
Ω
pF
Ω
pF
V
V
dB
dB
dB
dB
µV
p-p
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
fA/√Hz
MHz
kHz
V/µs
µs
3V/mV
V/mV
V/mV
V/mV
V
V
mA
Parameter
INPUT OFFSET VOLTAGE
1
Initial Offset
T
MIN
to T
MAX
vs. Temperature
vs. Supply
vs. Supply, T
MIN
to T
MAX
Long-Term Offset Stability
INPUT BIAS CURRENT
Either Input
2
, V
CM
= 0
Either Input
2
at T
MAX
, V
CM
= 0
Max Input Bias Current Over
Common-Mode Voltage Range
Offset Current, V
CM
= 0
Offset Current at T
MAX
INPUT IMPEDANCE
Differential
Common Mode
INPUT VOLTAGE RANGE
Differential
3
Common Mode
Common-Mode Rejection
V
CM
=
±
10 V
T
MIN
to T
MAX
V
CM
=
±
11 V
T
MIN
to T
MAX
INPUT VOLTAGE NOISE
Voltage 0.1 Hz to 10 Hz
f = 10 Hz
f = 100 Hz
f = 1 kHz
f = 10 kHz
INPUT CURRENT NOISE
f = 1 kHz
FREQUENCY RESPONSE
Unity Gain, Small Signal
Full Power Response
Slew Rate, Unity Gain
Settling Time to
±
0.01%
OPEN LOOP GAIN
V
O
=
±
10 V, R
L
≥
10 kΩ
T
MIN
to T
MAX
, R
L
≥
10 kΩ
V
O
=
±
10 V, R
L
≥
5 kΩ
T
MIN
to T
MAX
, R
L
≥
5 kΩ
OUTPUT CHARACTERISTICS
Voltage @ R
L
≥
10 kΩ,
T
MIN
to T
MAX
Voltage @ R
L
≥
5 kΩ,
T
MIN
to T
MAX
Short Circuit Current
Min
AD548J
Typ
0.75
Max
2.0
3.0/3.0/3.0
20
80
76/76/76
15
5
20
0.45/1.3/20
30
10
0.25/0.65/10
86
80
15
3
10
0.25/0.65
15
5
0.15/0.35
5
2
1
×
10
12
3
3
×
10
12
3
±
11
76
76/76/76
70
70/70/70
±
20
±
12
90
90
84
84
2
80
40
30
30
1.8
0.8
1.0
1.0
30
1.8
8
1000
700
500
300
0.8
1.0
±
11
82
82
76
76
1
×
10
12
3
3
×
10
12
3
±
20
±
12
92
92
86
86
2
80
40
30
30
1.8
1.0
30
1.8
8
1000
700
500
300
±
13
±
12.3
15
300
300/300/300
150
150/150/150
300
300
150
150
±
12
±
12
±
11
±
11
±
12
±
13
±
12/± 12/± 12
±
11
±
12.3
±
11/± 11/± 11
15
–2–
REV. D
AD548
SPECIFICATIONS (continued)
Min
POWER SUPPLY
Rated Performance
Operating Range
Quiescent Current
TEMPERATURE RANGE
Operating, Rated Performance
Commercial (0°C to 70°C)
Industrial (–40°C to +85°C)
Military (–55°C to +125°C)
PACKAGE OPTIONS
SOIC (R-8)
Plastic (N-8)
Tape and Reel
AD548J
Typ
±
15
170
Max
Min
AD548K/B
Typ
±
15
170
Max
Unit
V
V
µA
±
4.5
±
18
200
±
4.5
±
18
200
AD548J
AD548A
AD548S
AD548JR
AD548JN
4
AD548JR-REEL
AD548K
AD548B
AD548KR
4
AD548KN
AD548KR-REEL
4
NOTES
1
Input Offset Voltage specifications are guaranteed after five minutes of operation at T
A
= 25°C.
2
Bias Current specifications are guaranteed maximum at either input after five minutes of operation at T
A
= 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.
4
Not recommended for new designs; obsolete April 2002.
Specifications subject to change without notice.
REV. D
–3–
AD548
ABSOLUTE MAXIMUM RATINGS
l
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Internal Power Dissipation
2
. . . . . . . . . . . . . . . . . . . . 500 mW
Input Voltage
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . +V
S
and –V
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
AD548B . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°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; 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:
θ
JA
= 160°C/W,
θ
JC
= 42°C/W;
8-Lead Plastic Package:
θ
JA
= 90°C/W.
3
For supply voltages less than
±
18 V, the absolute maximum input voltage is equal
to the 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.
WARNING!
ESD SENSITIVE DEVICE
–4–
REV. D
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