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OP181-OP181GP-OP281GRU-OP281GS-OP481GS
Ultralow Power, Rail-to-Rail Output Operational Amplifiers
REV.0
Ultralow Power, Rail-to-Rail Output
Operational Amplifiers
PIN CONFIGURATIONSFEATURES
Low Supply Current:4 mA/Amplifier max
Single-Supply Operation:2.7V to 12V
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
GENERAL DESCRIPTIONThe 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 +3V and +5V single supply as well as ±5V 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 250μs.
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 SO8-Lead Epoxy DIP
(S Suffix)(P Suffix)
8-Lead SO8-Lead Epoxy DIP
(S Suffix)(P Suffix)
14-Lead Epoxy DIP14-Lead
(P Suffix)Narrow-Body SO
(S Suffix)
(RU Suffix)
NOTE: PIN ORIENTATION IS EQUIVALENT FOR
EACH PACKAGE VARIATION
OP181/OP281/OP481–SPECIFICATIONS
ELECTRICAL SPECIFICATIONSPOWER SUPPLY
NOISE PERFORMANCE
NOTESVOS is tested under no load condition.
Specifications subject to change without notice.
(@ VS = +3.0V, VCM = 1.5V, TA = +258C unless otherwise noted)
OP181/OP281/OP481
ELECTRICAL SPECIFICATIONSPOWER SUPPLY
NOISE PERFORMANCE
NOTESVOS is tested under a no load condition.
Specifications subject to change without notice.
(@ VS = +5.0V, VCM = 2.5V, TA = +258C unless otherwise noted1)
OP181/OP281/OP481–SPECIFICATIONS
ELECTRICAL SPECIFICATIONSNOTESVOS is tested under no load condition.
Specifications subject to change without notice.
(@ VS = ±5V, TA = +258C unless otherwise noted)
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although
ABSOLUTE MAXIMUM RATINGSSupply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +16 V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . Gnd to VS + 10 V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ±3.5 V
Output Short-Circuit Duration to Gnd . . . . . . . . . . Indefinite
Storage Temperature Range
P, S, RU Package . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Operating Temperature Range
OP181/OP281/OP481G . . . . . . . . . . . . . . . –40°C to +85°C
Junction Temperature Range
P, S, RU Package . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering, 60 sec) . . . . . . . +300°C
*θJA is specified for the worst case conditions, i.e., θJA is specified for device in socket
for P-DIP packages; θJA is specified for device soldered in circuit board for TSSOP
and SOIC packages.
ORDERING GUIDE
INPUT OFFSET VOLTAGE – mV
QUANTITY – Amplifiers Figure 1.Input Offset Voltage
Distribution
TEMPERATURE – 8C
INPUT BIAS CURRENT – nA Figure 4.Input Bias Current vs.
Temperature
LOAD CURRENT – µA
OUTPUT VOLTAGE – mV
10,000
1,000
1.0Figure 7.Output Voltage to Supply
Rail vs. Load Current
OP181/OP281/OP481–Typical Characteristics
INPUT OFFSET VOLTAGE – mV
QUANTITY – AmplifiersFigure 2.Input Offset Voltage
Distribution
COMMON-MODE VOLTAGE – Volts
INPUT BIAS CURRENT – nA
4.55.0 Figure 5.Input Bias Current vs.
Common-Mode Voltage
LOAD CURRENT – µA
OUTPUT VOLTAGE – mV
1,000
1.0 Figure 8.Output Voltage to Supply
Rail vs. Load Current
TEMPERATURE – 8C
INPUT OFFSET VOLTAGE – µV
100120 Figure 3.Input Offset Voltage vs.
Temperature
TEMPERATURE – 8C
INPUT OFFSET CURRENT – nA
100120 Figure 6.Input Offset Current vs.
Temperature
LOAD CURRENT – µA
OUTPUT VOLTAGE – mV
1,000
1.0Figure 9.Output Voltage to Supply
Rail vs. Load Current
FREQUENCY – Hz
OPEN-LOOP GAIN – dB
–301001k1M10k100k
PHASE SHIFT – DegreesFigure 10.Open-Loop Gain and Phase
vs. Frequency
FREQUENCY – Hz
OPEN-LOOP GAIN – dB
–301001k1M10k100k
PHASE SHIFT – DegreesFigure 13.Open-Loop Gain and Phase
vs. Frequency
FREQUENCY – Hz
CMRR – dB10k10M100k1M
–10Figure 16.CMRR vs. Frequency
Figure 12.Open-Loop Gain and Phase
vs. Frequency
Figure 15.Voltage Noise Density vs.
Frequency
CAPACITANCE – pF
SMALL SIGNAL OVERSHOOT – %101001000Figure 18.Small Signal Overshoot vs.
Load Capacitance
FREQUENCY – Hz
OPEN-LOOP GAIN – dB
–301001k1M10k100k
PHASE SHIFT – DegreesFigure 11.Open-Loop Gain and Phase
vs. Frequency
FREQUENCY – Hz
CLOSED-LOOP GAIN – dB1001M1k10k100k
–30Figure 14.Closed-Loop Gain vs.
Frequency
FREQUENCY – Hz
PSRR – dB1001M1k10k100k
–20Figure 17.PSRR vs. Frequency
OP181/OP281/OP48110
MAXIMUM OUTPUT SWING – Vp-p Figure 19.Maximum Output Swing
vs. Frequency
TEMPERATURE – 8C
SUPPLY CURRENT/AMPLIFIER – µA
4.0 Figure 22.Supply Current/Amplifier
vs. Temperature
Figure 25.Small Signal Transient
Response
Figure 21.
vs. Temperature
Figure 27.Large Signal Transient
Response
FREQUENCY – Hz100100k1k10kFigure 20.Maximum Output Swing
vs. Frequency
SUPPLY CURRENT/AMPLIFIER – µA
1.25Figure 23.
vs. Supply Voltage
Figure 26.Large Signal Transient
Response
