a
FEATURES
Low Supply Current: 4 A/Amplifier max
Single-Supply Operation: 2.7 V to 12 V
Wide Input Voltage Range
Rail-to-Rail Output Swing
Low Offset Voltage: 1.5 mV
No Phase Reversal
APPLICATIONS
Comparator
Battery Powered Instrumentation
Safety Monitoring
Remote Sensors
Low Voltage Strain Gage Amplifiers
Ultralow Power, Rail-to-Rail Output
Operational Amplifiers
OP181/OP281/OP481
PIN CONFIGURATIONS
8-Lead SO
(S Suffix)
NULL
–IN A
+IN A
V–
1
8
NC
V+
OUT A
NULL
8-Lead Epoxy DIP
(P Suffix)
NULL 1
–IN A 2
+IN A 3
V– 4
8 NC
OP181
4
5
OP181
7 V+
6 OUT A
5 NULL
NC = NO CONNECT
NC = NO CONNECT
8-Lead SO
(S Suffix)
OUT A
–IN A
+IN A
V–
1
8
V+
OUT B
–IN B
+IN B
8-Lead Epoxy DIP
(P Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
OP281
8 V+
7 OUT B
6 –IN B
5 +IN B
OP281
4
5
GENERAL DESCRIPTION
The OP181, OP281 and OP481 are single, dual and quad
ultralow power, single-supply amplifiers featuring rail-to-rail
outputs. All operate from supplies as low as 2.0 V and are
specified at +3 V and +5 V single supply as well as
±
5 V dual
supplies.
Fabricated on Analog Devices’ CBCMOS process, the OP181
family features a precision bipolar input and an output that
swings to within millivolts of the supplies and continues to sink
or source current all the way to the supplies.
Applications for these amplifiers include safety monitoring,
portable equipment, battery and power supply control, and
signal conditioning and interface for transducers in very low
power systems.
The output’s ability to swing rail-to-rail and not increase supply
current, when the output is driven to a supply voltage, enables
the OP181 family to be used as comparators in very low power
systems. This is enhanced by their fast saturation recovery time.
Propagation delays are 250
µs.
The OP181/OP281/OP481 are specified over the extended
industrial (–40°C to +85°C) temperature range. The OP181,
single, and OP281, dual, amplifiers are available in 8-pin plastic
DIPs and SO surface mount packages. The OP281 is also
available in 8-lead TSSOP. The OP481 quad is available in 14-
pin DIPs, narrow 14-pin SO and TSSOP packages.
8-Lead TSSOP
(RU Suffix)
1
4
8
5
OP281
14-Lead Epoxy DIP
(P Suffix)
14-Lead
Narrow-Body SO
(S Suffix)
1
14
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
14 OUT D
13 –IN D
12 +IN D
OP481
OP481
11 V–
10 +IN C
9 –IN C
8 OUT C
7
8
14-Lead TSSOP
(RU Suffix)
1
14
OP481
NOTE: PIN ORIENTATION IS EQUIVALENT FOR
EACH PACKAGE VARIATION
7
8
REV. 0
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: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1996
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