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PDF OP181 Data sheet ( Hoja de datos )
| Número de pieza | OP181 | |
| Descripción | Ultralow Power / Rail-to-Rail Output Operational Amplifiers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Ultralow Power, Rail-to-Rail Output
Operational Amplifiers
OP181/OP281/OP481
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
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.
PIN CONFIGURATIONS
8-Lead SO
(S Suffix)
8-Lead Epoxy DIP
(P Suffix)
NULL
–IN A
+IN A
V–
18
OP181
45
NC
V+
OUT A
NULL
NC = NO CONNECT
NULL 1
–IN A 2
+IN A 3
V– 4
OP181
8 NC
7 V+
6 OUT A
5 NULL
NC = NO CONNECT
8-Lead SO
(S Suffix)
OUT A
–IN A
+IN A
V–
18
OP281
45
V+
OUT B
–IN B
+IN B
8-Lead TSSOP
(RU Suffix)
18
OP281
45
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
14-Lead Epoxy DIP
(P Suffix)
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
OP481
14 OUT D
13 –IN D
12 +IN D
11 V–
10 +IN C
9 –IN C
8 OUT C
NOTE: PIN ORIENTATION IS EQUIVALENT FOR
EACH PACKAGE VARIATION
14-Lead
Narrow-Body SO
(S Suffix)
1 14
OP481
78
14-Lead TSSOP
(RU Suffix)
1 14
OP481
78
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
1 page  
OP181/OP281/OP481
ABSOLUTE MAXIMUM RATINGS
Supply 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
Package Type
8-Pin Plastic DIP (P)
8-Pin SOIC (S)
8-Pin TSSOP (RU)
14-Pin Plastic DIP (P)
14-Pin SOIC (S)
14-Pin TSSOP (RU)
JA*
103
158
240
76
120
240
JC Units
43 °C/W
43 °C/W
43 °C/W
33 °C/W
36 °C/W
43 °C/W
*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
Model
Temperature
Range
Package
Description
Package
Option
OP181GP –40°C to +85°C
OP181GS –40°C to +85°C
OP281GP –40°C to +85°C
OP281GS –40°C to +85°C
OP281GRU –40°C to +85°C
OP481GP –40°C to +85°C
OP481GS –40°C to +85°C
OP481GRU –40°C to +85°C
8-Pin Plastic DIP
8-Pin SOIC
8-Pin Plastic DIP
8-Pin SOIC
8-Pin TSSOP
14-Pin Plastic DIP
14-Pin SOIC
14-Pin TSSOP
N-8
SO-8
N-8
SO-8
RU-8
N-14
SO-14
RU-14
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 OP181/OP281/OP481 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precau-
tions are recommended to avoid performance degradation or loss of functionality.
REV. 0
–5–
WARNING!
ESD SENSITIVE DEVICE
5 Page 
OP181/OP281/OP481
100
VOUT 90
VIN
10
0%
0.1V
0.2ms
0V
100
90
10
0%
Figure 35. Input and Output Signals with VCM < 0 V
Overdrive Recovery Time
The amount of time it takes for an amplifier to recover from
saturation can be an important consideration when using an
amplifier as a comparator or when outputs can be driven to the
supplies. The overdrive recovery time for the OP181 is 50 µs
with the amplifier running from a 3 volt supply and increases
to 100 µs with a 10 volt supply. Figure 36 shows the result of
the OP181 running from a 3 V supply with its output being
overdriven.
VIN 100
SCALE 0.1V 90
0V
VOUT
SCALE 1V
0V
10
0%
0.1V
0.2ms
VS = +3V
AV = +100
Figure 36. Output of the Op Amp Recovering from
Saturation
Capacitive Loading
Most low supply current amplifiers have difficulty driving
capacitive loads due to the higher currents required from the
output stage for such loads. Higher capacitance at the output
will increase the amount of overshoot and ringing in the
amplifier’s step response and could even affect the stability of
the device. However, through careful design of the output stage
and its high phase margin, the OPx81 family can tolerate some
degree of capacitive loading. Figure 37 shows the step response
of an OP181 with a 10 nF capacitor connected at the output.
Notice that the overshoot of the output does not exceed more
than 10% with such a load, even with a supply voltage of only
+3 V.
Figure 37. Ringing and Overshoot of the Output of the
Amplifier
A Micropower Reference Voltage Generator
Many single supply circuits are configured with the circuit
biased to 1/2 of the supply voltage. In these cases, a false-
ground reference can be created by using a voltage divider
buffered by an amplifier. Figure 38 shows the schematic for
such a circuit.
The two 1 MΩ resistors generate the reference voltage while
drawing only 1.5 µA of current from a 3 V supply. A capacitor
connected from the inverting terminal to the output of the op
amp provides compensation to allow for a bypass capacitor to be
connected at the reference output. This bypass capacitor helps
establish an ac ground for the reference output. The entire
reference generator draws less than 5 µA from a 3 V supply
source.
+3V TO +12V
10kΩ
0.022µF
1MΩ
1MΩ
27
OP181
34
6
1µF
100Ω
1µF
VREF
+1.5V TO +6V
Figure 38. A Micropower Bias Voltage Generator
A Window Comparator
The extremely low power supply current demands of the OPx81
family make it ideal for use in long life battery powered applica-
tions such as a monitoring system. Figure 39 shows a circuit
that uses the OP281 as a window comparator.
REV. 0
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet OP181.PDF ] | |
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