Dual/Quad Rail-to-Rail
Operational Amplifiers
OP295/OP495
FEATURES
Rail-to-rail output swing
Single-supply operation: 3 V to 36 V
Low offset voltage: 300 μV
Gain bandwidth product: 75 kHz
High open-loop gain: 1000 V/mV
Unity-gain stable
Low supply current/per amplifier: 150 μA maximum
PIN CONFIGURATIONS
OUT A
–IN A
+IN A
V–
1
2
3
4
8
V+
OUT B
00331-001
00331-004
TOP VIEW
(Not to Scale)
OP295
7
6
5
–IN B
+IN B
Figure 1. 8-Lead Narrow-Body SOIC_N
(S Suffix)
APPLICATIONS
Battery-operated instrumentation
Servo amplifiers
Actuator drives
Sensor conditioners
Power supply control
OUT A
–IN A
+IN A
V–
1
2
3
4
OP295
8
7
6
5
V+
OUT B
00331-002
00331-003
–IN B
+IN B
Figure 2. 8-Lead PDIP
(P Suffix)
GENERAL DESCRIPTION
Rail-to-rail output swing combined with dc accuracy are the
key features of the OP495 quad and OP295 dual CBCMOS
operational amplifiers. By using a bipolar front end, lower noise
and higher accuracy than those of CMOS designs have been
achieved. Both input and output ranges include the negative
supply, providing the user with zero-in/zero-out capability. For
users of 3.3 V systems such as lithium batteries, the OP295/OP495
are specified for 3 V operation.
Maximum offset voltage is specified at 300 μV for 5 V operation,
and the open-loop gain is a minimum of 1000 V/mV. This yields
performance that can be used to implement high accuracy systems,
even in single-supply designs.
The ability to swing rail-to-rail and supply 15 mA to the load
makes the OP295/OP495 ideal drivers for power transistors and
H bridges. This allows designs to achieve higher efficiencies and
to transfer more power to the load than previously possible
without the use of discrete components.
For applications such as transformers that require driving
inductive loads, increases in efficiency are also possible.
Stability while driving capacitive loads is another benefit of this
design over CMOS rail-to-rail amplifiers. This is useful for
driving coax cable or large FET transistors. The OP295/OP495
are stable with loads in excess of 300 pF.
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
1
2
3
4
5
6
7
14
13
12
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
OP495
11
10
9
8
Figure 3. 14-Lead PDIP
(P Suffix)
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
NC
1
2
3
4
5
6
7
8
16
15
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
NC
TOP VIEW
(Not to Scale)
OP495
14
13
12
11
10
9
NC = NO CONNECT
Figure 4. 16-Lead SOIC_W
(S Suffix)
The OP295 and OP495 are specified over the extended indus-
trial (−40°C to +125°C) temperature range. The OP295 is
available in 8-lead PDIP and 8-lead SOIC_N surface-mount
packages. The OP495 is available in 14-lead PDIP and 16-lead
SOIC_W surface-mount packages.
Rev. E
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
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©2006 Analog Devices, Inc. All rights reserved.
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