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FEATURES
Low offset voltage: 60 μV maximum
Very low offset voltage drift: 0.7 μV/°C maximum
Low input bias current: 2 nA maximum
Low noise: 8 nV/√Hz typical
CMRR, PSRR, and AVO > 120 dB minimum
Low supply current: 400 μA per amplifier
Dual supply operation: ±2.5 V to ±15 V
Unity-gain stable
No phase reversal
Inputs internally protected beyond supply voltage
APPLICATIONS
Wireless base station control circuits
Optical network control circuits
Instrumentation
Sensors and controls
Thermocouples
Resistor thermal detectors (RTDs)
Strain bridges
Shunt current measurements
Precision filters
Precision Low Noise, Low Input
Bias Current Operational Amplifiers
OP1177/OP2177/OP4177
PIN CONFIGURATIONS
NC 1
8 NC
–IN
+IN
OP1177
V+
OUT
V– 4
5 NC
NC = NO CONNECT
Figure 1. 8-Lead MSOP (RM Suffix)
NC 1
–IN 2
+IN 3
V– 4
OP1177
8 NC
7 V+
6 OUT
5 NC
NC = NO CONNECT
Figure 2. 8-Lead SOIC_N (R Suffix)
OUT A
–IN A
+IN A
V–
18
OP2177
45
V+
OUT B
–IN B
+IN B
Figure 3. 8-Lead MSOP (RM Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
OP2177
8 V+
7 OUT B
6 –IN B
5 +IN B
Figure 4. 8-Lead SOIC_N (R Suffix)
OUT A 1
–IN A 2
14 OUT D
13 –IN D
+IN A 3
12 +IN D
V+ 4 OP4177 11 V–
+IN B 5
10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
Figure 5. 14-Lead SOIC_N (R Suffix)
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
1 14
OP4177
78
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
Figure 6. 14-Lead TSSOP (RU Suffix)
GENERAL DESCRIPTION
The OPx177 family consists of very high precision, single, dual,
and quad amplifiers featuring extremely low offset voltage and
drift, low input bias current, low noise, and low power consump-
tion. Outputs are stable with capacitive loads of over 1000 pF
with no external compensation. Supply current is less than 500 μA
per amplifier at 30 V. Internal 500 Ω series resistors protect the
inputs, allowing input signal levels several volts beyond either
supply without phase reversal.
Unlike previous high voltage amplifiers with very low offset
voltages, the OP1177 (single) and OP2177 (dual) amplifiers
are available in tiny 8-lead surface-mount MSOP and 8-lead
narrow SOIC packages. The OP4177 (quad) is available in
TSSOP and 14-lead narrow SOIC packages. Moreover, specified
performance in the MSOP and the TSSOP is identical to
performance in the SOIC package. MSOP and TSSOP are
available in tape and reel only.
The OPx177 family offers the widest specified temperature
range of any high precision amplifier in surface-mount packaging.
All versions are fully specified for operation from −40°C to
+125°C for the most demanding operating environments.
Applications for these amplifiers include precision diode
power measurement, voltage and current level setting, and
level detection in optical and wireless transmission systems.
Additional applications include line-powered and portable
instrumentation and controls—thermocouple, RTD, strain-
bridge, and other sensor signal conditioning—and precision filters.
Rev. G
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2001–2009 Analog Devices, Inc. All rights reserved.

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OP1177/OP2177/OP4177
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics............................................................. 4
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics ............................................. 6
Functional Description .................................................................. 14
Total Noise-Including Source Resistors................................... 14
Gain Linearity ............................................................................. 14
Input Overvoltage Protection ................................................... 15
Output Phase Reversal............................................................... 15
Settling Time ............................................................................... 15
REVISION HISTORY
11/09—Rev. F to Rev. G
Changes to Figure 64...................................................................... 19
Changes to Ordering Guide .......................................................... 24
Updated Outline Dimensions ....................................................... 22
5/09—Rev. E to Rev. F
Changes to Figure 64...................................................................... 19
Changes to Ordering Guide .......................................................... 24
10/07—Rev. D to Rev. E
Changes to General Description .................................................... 1
Changes to Table 4............................................................................ 5
Updated Outline Dimensions ....................................................... 22
7/06—Rev. C to Rev. D
Changes to Table 4............................................................................ 5
Changes to Figure 51...................................................................... 14
Changes to Figure 52...................................................................... 15
Changes to Figure 54...................................................................... 16
Changes to Figure 58 to Figure 61................................................ 17
Changes to Figure 62 and Figure 63............................................. 18
Changes to Figure 64...................................................................... 19
Changes to Figure 65 and Figure 66............................................. 20
Overload Recovery Time .......................................................... 15
THD + Noise............................................................................... 16
Capacitive Load Drive ............................................................... 16
Stray Input Capacitance Compensation.................................. 17
Reducing Electromagnetic Interference.................................. 17
Proper Board Layout.................................................................. 18
Difference Amplifiers ................................................................ 18
A High Accuracy Thermocouple Amplifier........................... 19
Low Power Linearized RTD...................................................... 19
Single Operational Amplifier Bridge ....................................... 20
Realization of Active Filters .......................................................... 21
Band-Pass KRC or Sallen-Key Filter........................................ 21
Channel Separation.................................................................... 21
References on Noise Dynamics and Flicker Noise ............... 21
Outline Dimensions ....................................................................... 22
Ordering Guide .......................................................................... 24
Changes to Figure 67 and Figure 68............................................. 21
Removed SPICE Model Section ................................................... 21
Updated Outline Dimensions....................................................... 22
Changes to Ordering Guide .......................................................... 24
4/04—Rev. B to Rev. C
Changes to Ordering Guide .............................................................4
Changes to TPC 6..............................................................................5
Changes to TPC 26............................................................................7
Updated Outline Dimensions....................................................... 17
4/02—Rev. A to Rev. B
Added OP4177.........................................................................Global
Edits to Specifications .......................................................................2
Edits to Electrical Characteristics Headings..................................4
Edits to Ordering Guide ...................................................................4
11/01—Rev. 0 to Rev. A
Edit to Features ..................................................................................1
Edits to TPC 6 ...................................................................................5
7/01—Revision 0: Initial Version
Rev. G | Page 2 of 24

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OP1177/OP2177/OP4177
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
VS = ±5.0 V, VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
OP1177
OP2177/OP4177
OP1177/OP2177
OP4177
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Symbol
VOS
VOS
VOS
VOS
IB
IOS
CMRR
Large Signal Voltage Gain
Offset Voltage Drift
OP1177/OP2177
OP4177
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
POWER SUPPLY
Power Supply Rejection Ratio
OP1177
AVO
ΔVOS/ΔT
ΔVOS/ΔT
VOH
VOL
IOUT
PSRR
OP2177/OP4177
PSRR
Supply Current per Amplifier
ISY
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
MULTIPLE AMPLIFIERS CHANNEL SEPARATION
SR
GBP
en p-p
en
in
CS
Conditions
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
VCM = −3.5 V to +3.5 V
−40°C < TA < +125°C
RL = 2 kΩ, VO = −3.5 V to +3.5 V
−40°C < TA < +125°C
−40°C < TA < +125°C
IL = 1 mA, −40°C < TA < +125°C
IL = 1 mA, −40°C < TA < +125°C
VDROPOUT < 1.2 V
VS = ±2.5 V to ±15 V
−40°C < TA < +125°C
VS = ±2.5 V to ±15 V
−40°C < TA < +125°C
VO = 0 V
−40°C < TA < +125°C
RL = 2 kΩ
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
DC
f = 100 kHz
Min Typ1 Max Unit
−2
−1
−3.5
120
118
1000
15
15
25
25
+0.5
+0.2
126
125
2000
60 μV
75 μV
100 μV
120 μV
+2 nA
+1 nA
+3.5 V
dB
dB
V/mV
0.2 0.7 μV/°C
0.3 0.9 μV/°C
+4 +4.1
V
−4.1 −4
V
±10 mA
120 130
dB
115 125
dB
118 121
dB
114 120
dB
400 500 μA
500 600 μA
0.7 V/μs
1.3 MHz
0.4
7.9
0.2
0.01
−120
8.5
μV p-p
nV/√Hz
pA/√Hz
μV/V
dB
1 Typical values cover all parts within one standard deviation of the average value. Average values given in many competitor data sheets as typical give unrealistically
low estimates for parameters that can have both positive and negative values.
Rev. G | Page 3 of 24

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OP1177/OP2177/OP4177
ELECTRICAL CHARACTERISTICS
VS = ±15 V, VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
OP1177
OP2177/OP4177
OP1177/OP2177
OP4177
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Offset Voltage Drift
OP1177/OP2177
OP4177
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
Short-Circuit Current
POWER SUPPLY
Power Supply Rejection Ratio
OP1177
OP2177/OP4177
Supply Current per Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
MULTIPLE AMPLIFIERS CHANNEL SEPARATION
Symbol
VOS
VOS
VOS
VOS
IB
IOS
CMRR
AVO
ΔVOS/ΔT
ΔVOS/ΔT
VOH
VOL
IOUT
ISC
PSRR
PSRR
ISY
SR
GBP
en p-p
en
in
CS
Conditions
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
VCM = −13.5 V to +13.5 V,
−40°C < TA < +125°C
RL = 2 kΩ, VO = –13.5 V to +13.5 V
−40°C < TA < +125°C
−40°C < TA < +125°C
IL = 1 mA, −40°C < TA < +125°C
IL = 1 mA, −40°C < TA < +125°C
VDROPOUT < 1.2 V
VS = ±2.5 V to ±15 V
−40°C < TA < +125°C
VS = ±2.5 V to ±15 V
−40°C < TA < +125°C
VO = 0 V
−40°C < TA < +125°C
RL = 2 kΩ
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
DC
f = 100 kHz
Min Typ1 Max Unit
−2
−1
−13.5
15
15
25
25
+0.5
+0.2
60
75
100
120
+2
+1
+13.5
μV
μV
μV
μV
nA
nA
V
120
1000
125
3000
dB
V/mV
0.2 0.7 μV/°C
0.3 0.9 μV/°C
+14 +14.1
V
−14.1 −14 V
±10 mA
±25 mA
120 130
dB
115 125
dB
118 121
dB
114 120
dB
400 500 μA
500 600 μA
0.7 V/μs
1.3 MHz
0.4
7.9
0.2
0.01
−120
8.5
μV p-p
nV/√Hz
pA/√Hz
μV/V
dB
1 Typical values cover all parts within one standard deviation of the average value. Average values given in many competitor data sheets as typical give unrealistically
low estimates for parameters that can have both positive and negative values.
Rev. G | Page 4 of 24

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ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage
Storage Temperature Range
R, RM, and RU Packages
Operating Temperature Range
OP1177/OP2177/OP4177
Junction Temperature Range
R, RM, and RU Packages
Lead Temperature, Soldering (10 sec)
Rating
36 V
VS− to VS+
±Supply Voltage
−65°C to +150°C
−40°C to +125°C
−65°C to +150°C
300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
OP1177/OP2177/OP4177
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 4. Thermal Resistance
Package Type
8-Lead MSOP (RM-8)1
8-Lead SOIC_N (R-8)
14-Lead SOIC_N (R-14)
14-Lead TSSOP (RU-14)
θJA
190
158
120
240
1 MSOP is available in tape and reel only.
θJC
44
43
36
43
Unit
°C/W
°C/W
°C/W
°C/W
ESD CAUTION
Rev. G | Page 5 of 24