Low Noise, Precision
Operational Amplifier
Data Sheet
OP27
Rev. H Document Feedback
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FEATURES
Low noise: 80 nV p-p (0.1 Hz to 10 Hz), 3 nV/√Hz
Low drift: 0.2 µV/°C
High speed: 2.8 V/µs slew rate, 8 MHz gain bandwidth
Low V
OS
: 10 µV
CMRR: 126 dB at VCM of ±11 V
High open-loop gain: 1.8 million
Available in die form
GENERAL DESCRIPTION
The OP27 precision operational amplifier combines the low
offset and drift of the
OP07 with both high speed and low noise.
Offsets down to 25 µV and maximum drift of 0.6 µV/°C make
the
OP27 ideal for precision instrumentation applications. Low
noise, e
n
= 3.5 nV/√Hz, at 10 Hz, a low 1/f noise corner
frequency of 2.7 Hz, and high gain (1.8 million), allow accurate
high-gain amplification of low-level signals. A gain bandwidth
product of 8 MHz and a 2.8 V/µs slew rate provide excellent
dynamic accuracy in high speed, data-acquisition systems.
A low input bias current of ±10 nA is achieved by use of a bias
current cancellation circuit. Over the military temperature
range, this circuit typically holds I
B
and IOS to ±20 nA and 15 nA,
respectively.
The output stage has good load driving capability. A guaranteed
swing of ±10 V into 600 Ω and low output distortion make the
OP27 an excellent choice for professional audio applications.
(Continued on Page 3)
PIN CONFIGURATIONS
V+
OUT
NC
4V– (CASE)
BAL
BAL 1
–IN 2
+IN 3
OP27
NC = NO CONNECT
00317-001
Figure 1. 8-Lead TO-99 (J-Suffix)
8
7
6
5
1
2
3
4
NC = NO CONNECT
V
OS
TRIM
–IN
+IN
V
OS
TRIM
V+
OUT
NCV–
OP27
00317-002
Figure 2. 8-Lead CERDIP – Glass Hermetic Seal (Z-Suffix),
8-Lead PDIP (P-Suffix), and 8-Lead SOIC (S-Suffix)
FUNCTIONAL BLOCK DIAGRAM
V
OS
ADJ.
NONINVERTING
INPUT (+)
INVERTING
INPUT (
–)
V–
V+
Q2B
R2
1
Q3
Q2A
Q1A Q1B
R4
R1
1
R3
1 8
.
R1 AND R2 ARE PERMANENTLY
ADJUSTED AT WAFER TEST FOR
MINIMUM OFFSET VOLTAGE
1
Q6
Q21
C2
R23 R24
Q23
Q24
Q22
R5
Q11 Q12
Q27 Q28
C1
R9
R12
C3 C4
Q26
Q20 Q19
Q46
Q45
OUTPUT
00317-003
Figure 3.
OP27* Product Page Quick Links
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Evaluation Kits
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Documentation
Application Notes
• AN-109: High Speed Precision Rectifier
• AN-111: Single-Supply Wien Bridge Oscillator
• AN-112: Single Resistor Controls Wien Bridge Oscillator
Frequency
• AN-117: OP-42 Advanced SPICE Macro-Model
• AN-138: SPICE-Compatible Op Amp Macro-Models
• AN-356: User's Guide to Applying and Measuring
Operational Amplifier Specifications
• AN-358: Noise and Operational Amplifier Circuits
• AN-649: Using the Analog Devices Active Filter Design
Tool
• AN-940: Low Noise Amplifier Selection Guide for Optimal
Noise Performance
Data Sheet
• OP27: Military Data Sheet
• OP27: Low Noise, Precision Operational Amplifier Data
Sheet
Software and Systems Requirements
• JAN to Generic Cross Reference
Last Content Update: 08/30/2016
Tools and Simulations
• Analog Filter Wizard
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Reference Materials
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• Ask The Applications Engineer - 25 Op Amps Driving
Capacitive Loads
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OP27 Data Sheet
Rev. H | Page 2 of 21
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 4
Electrical Characteristics ............................................................. 4
Typical Electrical Characteristics ............................................... 6
Absolute Maximum Ratings ............................................................ 7
Thermal Resistance ...................................................................... 7
ESD Caution .................................................................................. 7
Typical Performance Characteristics ..............................................8
Applications Information .............................................................. 14
Offset Voltage Adjustment ........................................................ 14
Noise Measurements .................................................................. 14
Unity-Gain Buffer Applications ............................................... 14
Comments On Noise ................................................................. 15
Audio Applications .................................................................... 16
References .................................................................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 21
REVISION HISTORY
10/15—Rev. G to Rev. H
Changes to Features Section and General Description Section ..... 1
Changes to Note 1, Ordering Guide ................................................. 21
3/15—Rev. F to Rev. G
Changes to General Description Section ...................................... 3
Changes to Figure 31 ...................................................................... 12
Changes to Applications Information Section and Output
Voltage Adjustment Section .......................................................... 14
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 21
5/06—Rev. E to Rev. F
Removed References to 745 .............................................. Universal
Updated 741 to AD741 ...................................................... Universal
Changes to Ordering Guide .......................................................... 20
12/05—Rev. D to Rev. E
Edits to Figure 2 ................................................................................ 1
9/05—Rev. C to Rev. D
Updated Format .................................................................. Universal
Changes to Table 1 ............................................................................ 4
Removed Die Characteristics Figure ............................................. 5
Removed Wafer Test Limits Table .................................................. 5
Changes to Table 5 ............................................................................ 7
Changes to Comments on Noise Section .................................... 15
Changes to Ordering Guide .......................................................... 24
1/03—Rev. B to Rev. C
Edits to Pin Connections .................................................................. 1
Edits to General Description ........................................................... 1
Edits to Die Characteristics .............................................................. 5
Edits to Absolute Maximum Ratings .............................................. 7
Updated Outline Dimensions ....................................................... 16
Edits to Figure 8 .............................................................................. 14
Edits to Outline Dimensions......................................................... 16
9/01—Rev. 0 to Rev. A
Edits to Ordering Information ........................................................ 1
Edits to Pin Connections .................................................................. 1
Edits to Absolute Maximum Ratings .............................................. 2
Edits to Package Type ....................................................................... 2
Edits to Electrical Characteristics .............................................. 2, 3
Edits to Wafer Test Limits ................................................................ 4
Deleted Typical Electrical Characteristics...................................... 4
Edits to Burn-In Circuit Figure ....................................................... 7
Edits to Application Information .................................................... 8
Data Sheet OP27
Rev. H | Page 3 of 21
GENERAL DESCRIPTION
(Continued from Page 1)
PSRR and CMRR exceed 120 dB. These characteristics, coupled
with long-term drift of 0.2 µV/month, allow the circuit designer
to achieve performance levels previously attained only by discrete
designs.
Low cost, high volume production of
OP27 is achieved by
using an on-chip Zener zap-trimming network. This reliable
and stable offset trimming scheme has proven its effectiveness
over many years of production history.
The
OP27 provides excellent performance in low noise,
high accuracy amplification of low level signals. Applications
include stable integrators, precision summing amplifiers,
precision voltage threshold detectors, comparators, and
professional audio circuits such as tape heads and microphone
preamplifiers.
OP27 Data Sheet
Rev. H | Page 4 of 21
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
VS = ±15 V, TA = 25°C, unless otherwise noted.
Table 1.
OP27A/OP27E OP27G
Parameter
Symbol
Test Conditions
Min
Typ
Max
Min
Typ
Max
Unit
INPUT OFFSET VOLTAGE1
VOS
10
25 30
100
µV
LONG-TERM VOS STABILITY2, 3 VOS/Time 0.2 1.0 0.4 2.0 µV/MO
INPUT OFFSET CURRENT IOS 7 35 12 75 nA
INPUT BIAS CURRENT IB ±10 ±40 ±15 ±80 nA
INPUT NOISE VOLTAGE
3, 4
e
n p-p
0.1 Hz to 10 Hz 0.08 0.18 0.09 0.25 µV p-p
INPUT NOISE en fO = 10 Hz 3.5 5.5 3.8 8.0 nV/√Hz
Voltage Density3 fO = 30 Hz 3.1 4.5 3.3 5.6 nV/√Hz
fO = 1000 Hz 3.0 3.8 3.2 4.5 nV/√Hz
INPUT NOISE in fO = 10 Hz 1.7 4.0 1.7 pA/√Hz
Current Density3 fO = 30 Hz 1.0 2.3 1.0 pA/√Hz
fO = 1000 Hz 0.4 0.6 0.4 0.6 pA/√Hz
INPUT RESISTANCE
Differential Mode5 RIN 1.3 6 0.7 4 MΩ
Common Mode R
INCM
3 2 GΩ
INPUT VOLTAGE RANGE IVR ±11.0 ±12.3 ±11.0 ±12.3 V
COMMON-MODE REJECTION RATIO CMRR VCM = ±11 V 114 126 100 120 dB
POWER SUPPLY REJECTION RATIO PSRR VS = ±4 V to ±18 V 1 10 2 20 µV/V
LARGE SIGNAL VOLTAGE GAIN AVO RL ≥ 2 kΩ, VO = ±10 V 1000 1800 700 1500 V/mV
RL ≥ 600 Ω, VO = ±10 V 800 1500 600 1500 V/mV
OUTPUT VOLTAGE SWING VO RL ≥ 2 kΩ ±12.0 ±13.8 ±11.5 ±13.5 V
RL ≥ 600 Ω ±10.0 ±11.5 ±10.0 ±11.5 V
SLEW RATE6 SR RL ≥ 2 kΩ 1.7 2.8 1.7 2.8 V/µs
GAIN BANDWIDTH PRODUCT6 GBW 5.0 8.0 5.0 8.0 MHz
OPEN-LOOP OUTPUT RESISTANCE RO VO = 0, IO = 0 70 70 Ω
POWER CONSUMPTION Pd VO 90 140 100 170 mW
OFFSET ADJUSTMENT RANGE RP = 10 kΩ ±4.0 ±4.0 mV
1
Input offset voltage measurements are performed approximately 0.5 seconds after application of power. A/E grades guaranteed fully warmed up.
2
Long-term input offset voltage stability refers to the average trend line of VOS vs. time over extended periods after the first 30 days of operation. Excluding the initial
hour of operation, changes in VOS during the first 30 days are typically 2.5 µV. Refer to the Typical Performance Characteristics section.
3
Sample tested.
4
See voltage noise test circuit (Figure 31).
5
Guaranteed by input bias current.
6
Guaranteed by design.
Data Sheet OP27
Rev. H | Page 5 of 21
VS = ±15 V, −55°C ≤ TA ≤ 125°C, unless otherwise noted.
Table 2.
OP27A
Parameter Symbol Test Conditions Min Typ Max Unit
INPUT OFFSET VOLTAGE1 VOS 30 60 µV
AVERAGE INPUT OFFSET DRIFT TCV
OS
2
TCV
OSn
3
0.2 0.6 µV/°C
INPUT OFFSET CURRENT IOS 15 50 nA
INPUT BIAS CURRENT IB ±20 ±60 nA
INPUT VOLTAGE RANGE IVR ±10.3 ±11.5 V
COMMON-MODE REJECTION RATIO CMRR VCM = ±10 V 108 122 dB
POWER SUPPLY REJECTION RATIO PSRR VS = ±4.5 V to ±18 V 2 16 µV/V
LARGE SIGNAL VOLTAGE GAIN AVO RL ≥ 2 kΩ, VO = ±10 V 600 1200 V/mV
OUTPUT VOLTAGE SWING VO RL ≥ 2 kΩ ±11.5 ±13.5 V
1
Input offset voltage measurements are performed by automated test equipment approximately 0.5 seconds after application of power. A/E grades guaranteed fully
warmed up.
2
The TCVOS performance is within the specifications unnulled or when nulled with RP = 8 kΩ to 20 kΩ. TCVOS is 100% tested for A/E grades, sample tested for G grades.
3
Guaranteed by design.
VS = ±15 V, −25°C ≤ TA ≤ 85°C for OP27J and OP27Z and −40°C ≤ TA ≤ 85°C for OP27GS, unless otherwise noted.
Table 3.
OP27E OP27G
Parameter Symbol Test Conditions Min Typ Max Min Typ Max Unit
INPUT ONSET VOLTAGE VOS 20 50 55 220 µV
AVERAGE INPUT OFFSET DRIFT TCV
OS
1
0.2 0.6 0 4 1.8 µV/°C
TCV
OSn
2
0.2 0.6 0 4 1.8 µV/°C
INPUT OFFSET CURRENT IOS 10 50 20 135 nA
INPUT BIAS CURRENT IB ±14 ±60 ±25 ±150 nA
INPUT VOLTAGE RANGE IVR ±10.5 ±11.8 ±10.5 ±11.8 V
COMMON-MODE REJECTION RATIO
CMRR
VCM = ±10 V
110
124 96
118 dB
POWER SUPPLY REJECTION RATIO PSRR VS = ±4.5 V to ±18 V 2 15 2 32 µV/V
LARGE SIGNAL VOLTAGE GAIN AVO RL ≥ 2 kΩ, VO = ±10 V 750 1500 450 1000 V/mV
OUTPUT VOLTAGE SWING
VO
RL ≥ 2 kΩ
±11.7
±13.6
±11.0
±13.3
V
1
The TCVOS performance is within the specifications unnulled or when nulled with RP = 8 kΩ to 20 kΩ. TCVOS is 100% tested for A/E grades, sample tested for C/G grades.
2
Guaranteed by design.
OP27 Data Sheet
Rev. H | Page 6 of 21
TYPICAL ELECTRICAL CHARACTERISTICS
VS = ±15 V, TA = 25°C unless otherwise noted.
Table 4.
Parameter Symbol Test Conditions OP27N Typical Unit
AVERAGE INPUT OFFSET VOLTAGE DRIFT1 TCVOS or TCV
OSn
Nulled or unnulled, RP = 8 kΩ to 20 kΩ 0.2 µV/°C
AVERAGE INPUT OFFSET CURRENT DRIFT TCIOS 80 pA/°C
AVERAGE INPUT BIAS CURRENT DRIFT TCIB 100 pA/°C
INPUT NOISE VOLTAGE DENSITY en fO = 10 Hz 3.5 nV/√Hz
fO = 30 Hz 3.1 nV/√Hz
fO = 1000 Hz 3.0 nV/√Hz
INPUT NOISE CURRENT DENSITY in fO = 10 Hz 1.7 pA/√Hz
fO = 30 Hz 1.0 pA/√Hz
fO = 1000 Hz 0.4 pA/√Hz
INPUT NOISE VOLTAGE SLEW RATE e
np-p
0.1 Hz to 10 Hz 0.08 µV p-p
SR RL ≥ 2 kΩ 2.8 V/µs
GAIN BANDWIDTH PRODUCT GBW 8 MHz
1
Input offset voltage measurements are performed by automated test equipment approximately 0.5 seconds after application of power.
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