Ultralow Power, Rail-to-Rail Output
Operational Amplifiers
OP281/OP481
PIN CONFIGURATIONS
FEATURES
Low supply current: 4 μA/amplifier maximum
Single-supply operation: 2.7 V to 12 V
Wide input voltage range
V+
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
OP281
OUT B
–IN B
+IN B
TOP VIEW
(Not to Scale)
Rail-to-rail output swing
Low offset voltage: 1.5 mV
Figure 1. 8-Lead
Narrow-Body SOIC
(R Suffix)
No phase reversal
APPLICATIONS
Comparator
Battery-powered instrumentation
Safety monitoring
1
2
3
4
V+
OUT A
–IN A
+IN A
V–
8
OP281
7
6
5
OUT B
–IN B
+IN B
TOP VIEW
(Not to Scale)
Remote sensors
Low voltage strain gage amplifiers
Figure 2. 8-Lead TSSOP
(RU Suffix)
GENERAL DESCRIPTION
The OP281 and OP481 are dual and quad ultralow power
single-supply amplifiers featuring rail-to-rail outputs. Each
operates from supplies as low as 2.0 V and is specified at +3 V
and +5 V single supplies as well as 5 V dual supplies.
1
2
3
4
5
6
7
14 OUT D
OUT A
–IN A
+IN A
V+
13 –IN D
12 +IN D
OP481
V–
11
10
9
TOP VIEW
(Not to Scale)
+IN C
–IN C
OUT C
+IN B
–IN B
OUT B
Fabricated on Analog Devices’ CBCMOS process, the
8
OP281/OP481 feature a precision bipolar input and an output
that swings to within millivolts of the supplies, continuing to
sink or source current up to a voltage equal to the supply voltage.
Figure 3. 14-Lead
Narrow-Body SOIC
(R Suffix)
Applications for these amplifiers include safety monitoring,
portable equipment, battery and power supply control, and
signal conditioning and interfacing for transducers in very low
power systems.
1
14
13
OUT A
–IN A
+IN A
V+
OUT D
–IN D
+IN D
V–
2
3
4
5
6
7
12
OP481
TOP VIEW
11
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 OP281/OP481 to be used as comparators in very low power
systems. This is enhanced by their fast saturation recovery time.
Propagation delays are 250 μs.
(Not to Scale)
10
9
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
8
Figure 4. 14-Lead TSSOP
(RU Suffix)
The OP281/OP481 are specified over the extended industrial
temperature range (−40°C to +85°C). The OP281 dual amplifier
is available in 8-lead SOIC surface-mount and TSSOP packages.
The OP481 quad amplifier is available in narrow 14-lead SOIC
and TSSOP packages.
Rev. C
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