Micropower Single-Supply
Rail-to-Rail Input/Output Op Amps
a
OP191/OP291/OP491
FEATURES
O P 191/O P 291/O P 491 P IN CO NFIGURATIO NS
Single-Supply Operation: 2.7 V to 12 V
Wide Input Voltage Range
Rail-to-Rail Output Sw ing
Low Supply Current: 300 µA/ Am p
Wide Bandw idth: 3 MHz
Slew Rate: 0.5 V/ µs
8-Lead Narrow-Body SO
(S Suffix)
8-Lead Epoxy D IP
(P Suffix)
1
2
3
4
8
7
6
5
NC
1
2
3
4
8
7
6
5
NC
–INA
+INA
–V
OP191
OP191
V+
Low Offset Voltage: 700 µV
No Phase Reversal
OUTA
NC
APPLICATIONS
NC = NO CONNECT
Industrial Process Control
Battery Pow ered Instrum entation
Pow er Supply Control and Protection
Telecom
8-Lead Narrow-Body SO
(S Suffix)
8-Lead Epoxy D IP
(P Suffix)
Rem ote Sensors
Low Voltage Strain Gage Am plifiers
DAC Output Am plifier
1
2
3
4
8
7
6
5
+V
1
2
3
4
8
7
6
5
OUTA
–INA
+INA
–V
OP291
OP291
OUTB
–INB
+INB
GENERAL D ESCRIP TIO N
T he OP191, OP291 and OP491 are single, dual and quad
micropower, single-supply, 3 MHz bandwidth amplifiers fea-
turing rail-to-rail inputs and outputs. All are guaranteed to
operate from a 3 volt single supply as well as ±5 volt dual
supplies.
14-Lead Epoxy D IP
(P Suffix)
14-Lead SO
(S Suffix)
Fabricated on Analog Devices’ CBCMOS process, the OP191
family has a unique input stage that allows the input voltage to
safely extend 10 volts beyond either supply without any phase
inversion or latch-up. T he output voltage swings to within
millivolts of the supplies and continues to sink or source
current all the way to the supplies.
1
2
3
4
5
6
7
14
OUTD
OUTA
–INA
+INA
+V
1
2
3
4
5
6
7
14
13
12
OUTA
–INA
+INA
+V
OUTD
–IND
+IND
13 –IND
12 +IND
11 –V
OP491
10
9
+INC
–INC
OUTC
+INB
–INB
OUTB
11 –V
OP491
10 +INC
+INB
–INB
OUTB
8
9
8
–INC
Applications for these amplifiers include portable telecom
equipment, power supply control and protection, and interface
for transducers with wide output ranges. Sensors requiring a
rail-to-rail input amplifier include Hall effect, piezo electric,
and resistive transducers.
OUTC
T he ability to swing rail-to-rail at both the input and output
enables designers to build multistage filters in single-supply
systems and maintain high signal-to-noise ratios.
14-Lead
TSSO P
(RU Suffix)
T he OP191/OP291/OP491 are specified over the extended
industrial (–40°C to +125°C) temperature range. T he OP191
single and OP291 dual amplifiers are available in 8-pin plastic
DIPs and SO surface mount packages. T he OP491 quad is
available in 14-pin DIPs and narrow 14-pin SO packages.
Consult factory for OP491 T SSOP availability.
1
2
3
4
5
6
7
14
13
12
11
10
9
OP491
8
REV. 0
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood. MA 02062-9106, U.S.A.
Tel: 617/ 329-4700 Fax: 617/ 326-8703
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