Micropower Single-Supply
Rail-to-Rail Input/Output Op Amps
a
OP191/OP291/OP491
FEATURES
Single-Supply Operation: 2.7 V to 12 V
Wide Input Voltage Range
Rail-to-Rail Output Swing
Low Supply Current: 300 A/Amp
Wide Bandwidth: 3 MHz
Slew Rate: 0.5 V/s
PIN CONFIGURATIONS
8-Lead Narrow-Body SO
8-Lead Narrow-Body SO
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
Low Offset Voltage: 700 V
No Phase Reversal
OP191
OP291
APPLICATIONS
Industrial Process Control
Battery-Powered Instrumentation
Power Supply Control and Protection
Telecom
8-Lead Plastic DIP
14-Lead Plastic DIP
Remote Sensors
Low-Voltage Strain Gage Amplifiers
DAC Output Amplifier
+V
1
2
3
4
5
6
7
1
2
3
4
8
7
6
5
14
13
12
OUTA
–INA
+INA
–V
OUTA
–INA
+INA
+V
OUTD
–IND
+IND
OP291
OUTB
–INB
+INB
GENERAL DESCRIPTION
11 –V
OP491
The 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 V single supply as well as 5 V dual supplies.
10 +INC
+INB
–INB
OUTB
9
8
–INC
OUTC
Fabricated on Analog Devices’ CBCMOS process, the OP191
family has a unique input stage that allows the input voltage to
safely extend 10 V beyond either supply without any phase inver-
sion or latch-up. The output voltage swings to within millivolts
of the supplies and continues to sink or source current all the
way to the supplies.
14-Lead SO
14-Lead TSSOP
1
2
3
4
5
6
7
14
13
12
11
10
9
1
2
3
4
5
6
7
14
OUTD
OUTA
–INA
+INA
+V
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.
13 –IND
12 +IND
11 –V
OP491
OP491
10
9
+INC
–INC
OUTC
+INB
–INB
OUTB
8
8
The 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.
The OP191/OP291/OP491 are specified over the extended
industrial (–40°C to +125°C) temperature range. The OP191
single and OP291 dual amplifiers are available in 8-lead plastic
SO surface mount packages*. The OP491 quad is available in
14-lead DIPs and narrow 14-lead SO packages. Consult factory
for OP491 TSSOP availability.
*
The OP291 dual is also available in 8-lead Plastic Dip.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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Tel: 781/329-4700
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www.analog.com
© Analog Devices, Inc., 2002