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a
OP191/OP291/OP491
GE NE RAL DE SCRIPT ION
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
operatefrom a 3 volt singlesupply as well as
±
5 volt dual
supplies.
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.
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.
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.
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.
Mcropower Single-Supply
Rail-to-Rail Input/Output Op Amps
OP191/OP291/OP491 PIN CONFIGURAT IONS
8-Lead Narrow-Body SO 8-Lead E poxy DIP
(S Suffix) (P Suffix)
NC = NO CONNECT
1
2
3
4
8
7
6
5
OP191
OUTA
V+
NC
NC
NC
–INA
+INA
–V
1
2
3
4
8
7
6
5
OP191
8-Lead Narrow-Body SO
(S Suffix)
8-Lead E poxy DIP
(P Suffix)
1
2
3
4
8
7
6
5
OP291
OUTB
–INB
+INB
+V
OUTA
–INA
+INA
–V
1
2
3
4
8
7
6
5
OP291
14-Lead E poxy DIP
(P Suffix)
14-Lead SO
(S Suffix)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OP491
OUTD
–IND
+IND
–V
+INC
–INC
OUTC
OUTA
–INA
+INA
+V
+INB
–INB
OUTB
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OP491
OUTD
–IND
+IND
–V
+INC
–INC
OUTC
OUTA
–INA
+INA
+V
+INB
–INB
OUTB
14-Lead
T SSOP
(RU Suffix)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OP491
FEATURES
Single-Supply Operation: 2.7 V to 12 V
Wide Input Voltage Range
Rail-to-Rail Output Swing
Low Supply Current: 300
μ
A/Amp
Wide Bandwidth: 3 MHz
Slew Rate: 0.5 V/
μ
s
Low Offset Voltage: 700
μ
V
No Phase Reversal
APPLICATIONS
Industrial Process Control
Battery Powered Instrumentation
Power Supply Control and Protection
Telecom
Remote Sensors
Low Voltage Strain Gage Amplifiers
DAC Output Amplifier