Ultraprecision, 36 V, 2.8 nV/√Hz
Dual Rail-to-Rail Out
p
ut O
p
Am
p
Data Sheet AD8676
Rev. C
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
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Trademarks and registered trademarks are the property of their respective owners.
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 ©2006–2011 Analog Devices, Inc. All rights reserved.
FEATURES
Very low voltage noise 2.8 nV/√Hz @ 1 kHz
Rail-to-rail output swing
Low input bias current: 2 nA maximum
Very low offset voltage: 12 μV typical
Low input offset drift: 0.6 μV/°C maximum
Very high gain: 120 dB
Wide bandwidth: 10 MHz typical
±5 V to ±18 V operation
APPLICATIONS
Precision instrumentation
PLL filters
Laser diode control loops
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
PIN CONFIGURATIONS
OUT A 1
–IN A 2
+IN A 3
V– 4
V+8
OUT B
7
–IN B6
+IN B5
AD8676
TOP VIEW
(Not to Scale)
06487-001
Figure 1. 8-Lead SOIC_N (R-8)
OUT A
1
–IN A
2
+IN A
3
V–
4
V+
8
OUT B
7
–IN B
6
+IN B
5
AD8676
TOP VIEW
(Not to Scale)
06487-002
Figure 2. 8-Lead MSOP (RM-8)
GENERAL DESCRIPTION
The AD8676 precision operational amplifier offers ultralow
offset, drift, and voltage noise combined with very low input
bias currents over the full operating temperature range. The
AD8676 is a precision, wide bandwidth op amp featuring rail-
to-rail output swings and very low noise. Operation is fully
specified from ±5 V to ±15 V.
The AD8676 features a rail-to-rail output like that of the OP184,
but with wide bandwidth and even lower voltage noise, com-
bined with the precision and low power consumption like that
of the industry-standard OP07 amplifier. Unlike other low
noise, rail-to-rail op amps, the AD8676 has very low input bias
current and low input current noise.
With typical offset voltage of only 12 µV, offset drift of 0.2 µV/°C,
and noise of only 0.10 V p-p (0.1 Hz to 10 Hz), the AD8676 is
perfectly suited for applications where large error sources
cannot be tolerated. Precision instrumentation, PLL and other
precision filter circuits, position and pressure sensors, medical
instrumentation, and strain gage amplifiers benefit greatly from
the very low noise, low input bias current, and wide bandwidth.
Many systems can take advantage of the low noise, dc precision,
and rail-to-rail output swing provided by the AD8676 to maxi-
mize SNR and dynamic range.
The smaller packages and low power consumption afforded by
the AD8676 allow maximum channel density or minimum
board size for space-critical equipment.
The AD8676 is specified for the extended industrial temperature
range (−40°C to +125°C). The AD8676 is available in the 8-lead
MSOP, and the popular 8-lead, narrow SOIC; both of which are
lead-free packages. MSOP packaged devices are only available
in tape and reel format.
For the single version of this ultraprecision, rail-to-rail op amp,
see the AD8675 data sheet.
The AD8675 and AD8676 are members of a growing series of
low noise op amps offered by Analog Devices, Inc.
Table 1. Voltage Noise
Package 0.9 nV 1.1 nV 1.8 nV 2.8 nV 3.8 nV
Single AD797 AD8597 ADA4004-1 AD8675 AD8671
Dual AD8599 ADA4004-2 AD8676 AD8672
Quad ADA4004-4 AD8674
AD8676 Data Sheet
Rev. C | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Specifications ............................................................... 3
Absolute Maximum Ratings ............................................................5
Thermal Resistance .......................................................................5
Power Sequencing .........................................................................5
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
REVISION HISTORY
8/11—Rev. B to Rev. C
Change to Y-Axis Label, Figure 9 ................................................... 7
11/09—Rev. A to Rev. B
Changes to General Description Section ...................................... 1
Added Table 1; Renumbered Sequentially .................................... 1
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 11
4/08—Rev. 0 to Rev. A
Changes to Table 1 ............................................................................. 3
Changes to Table 2 ............................................................................. 4
Changes to Figure 6, Figure 7, Figure 8 .......................................... 6
Changes to Figure 9 through Figure 12 .......................................... 7
Changes to Figure 21, Figure 22, and Figure 25 ............................ 9
Added Figure 26, Renumbered Sequentially ................................. 9
Changes to Figure 27 ...................................................................... 10
Added Figure 28, Renumbered Sequentially .............................. 10
10/06—Revision 0: Initial Version
Data Sheet AD8676
Rev. C | Page 3 of 12
SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
VS = ±5.0 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS
B Grade (SOIC) 12 50 μV
B Grade (MSOP) 60 μV
A Grade (SOIC, MSOP) 100 μV
Offset Voltage VOS −40°C ≤ TA ≤ +125°C
B Grade (SOIC, MSOP) 15 160 μV
A Grade (SOIC, MSOP) 250 μV
Input Bias Current IB −2 +2 nA
−40°C ≤ TA ≤ +125°C −5.5 +5.5 nA
Input Offset Current IOS −1 +1 nA
−40°C ≤ TA ≤ +125°C −2.8 +2.8 nA
Input Voltage Range −3.0 +3.0 V
Common-Mode Rejection Ratio CMRR VCM = −3.0 V to +3.0 V 105 130 dB
−40°C ≤ TA ≤ +125°C 105 dB
Open-Loop Gain AVO R
L = 2 kΩ to ground, 120 126 dB
V
O = −3.5 V to +3.5 V
−40°C ≤ TA ≤ +125°C 117 dB
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.2 0.6 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH R
L = 10 kΩ to ground +4.90 +4.95 V
−40°C ≤ TA ≤ +125°C +4.85 V
R
L = 2 kΩ to ground +4.80 +4.89 V
−40°C ≤ TA ≤ +125°C +4.75 V
Output Voltage Low VOL R
L = 10 kΩ to ground −4.98 −4.90 V
−40°C ≤ TA ≤ +125°C −4.85 V
R
L = 2 kΩ to ground −4.91 −4.86 V
−40°C ≤ TA ≤ +125°C −4.82 V
Short-Circuit Limit ISC +40 mA
Output Current IO ±20 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = ±5.0 V to ±15.0 V 106 120 dB
−40°C ≤ TA ≤ +125°C 106 120 dB
Supply Current/Amplifier ISY V
O = 0 V 2.5 3.2 mA
−40°C ≤ TA ≤ +125°C 3.8 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 2.5 V/μs
Gain Bandwidth Product GBP 10 MHz
NOISE PERFORMANCE
Voltage Noise en p-p 0.1 Hz to 10 Hz 0.1 μV p-p
Voltage Noise Density en f = 1 kHz 2.8 nV/√Hz
Current Noise Density in f = 10 Hz 0.3 pA/√Hz
AD8676 Data Sheet
Rev. C | Page 4 of 12
VS = ±15 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified.
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS
B Grade (SOIC) 12 50 μV
B Grade (MSOP) 60 μV
A Grade (SOIC, MSOP) 100 μV
Offset Voltage VOS −40°C ≤ TA ≤ +125°C
B Grade (SOIC, MSOP) 15 160 μV
A Grade (SOIC, MSOP) 250 μV
Input Bias Current IB −2 +2 nA
−40°C ≤ TA ≤ +125°C −4.5 +4.5 nA
Input Offset Current IOS −1 +1 nA
−40°C ≤ TA ≤ +125°C −2.8 +2.8 nA
Input Voltage Range −12.5 +12.5 V
Common-Mode Rejection Ratio CMRR VCM = −12.5 V to +12.5 V 111 130 dB
−40°C ≤ TA ≤ +125°C 107 130 dB
Open-Loop Gain AVO R
L = 2 kΩ to ground, 123 132 dB
V
O = −13.5 V to +13.5 V
−40°C ≤ TA ≤ +125°C 117 dB
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.2 0.6 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH R
L = 10 kΩ to ground +14.85 +14.92 V
−40°C ≤ TA ≤ +125°C +14.80 V
R
L = 2 kΩ to ground +14.60 +14.75 V
−40°C ≤ TA ≤ +125°C +14.40 V
Output Voltage Low VOL R
L = 10 kΩ to ground −14.96 −14.94 V
−40°C ≤ TA ≤ +125°C −14.90 V
R
L = 2 kΩ to ground −14.85 −14.75 V
−40°C ≤ TA ≤ +125°C −14.60 V
Short-Circuit Limit ISC +40 mA
Output Current IO ±20 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = ±5.0 V to ±15.0 V 106 120 dB
−40°C ≤ TA ≤ +125°C 106 dB
Supply Current/Amplifier ISY V
O = 0 V 2.7 3.4 mA
−40°C ≤ TA ≤ +125°C 4.2 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL =10 kΩ 2.5 V/μs
Gain Bandwidth Product GBP 10 MHz
NOISE PERFORMANCE
Voltage Noise en p-p 0.1 Hz to 10 Hz 0.1 μV p-p
Voltage Noise Density en f = 1 kHz 2.8 nV/√Hz
Current Noise Density in f = 10 Hz 0.3 pA/√Hz
Data Sheet AD8676
Rev. C | Page 5 of 12
ABSOLUTE MAXIMUM RATINGS
THERMAL RESISTANCE
Table 4.
Parameter Rating
Supply Voltage ±18 V
Input Voltage ±V supply
Differential Input Voltage ±0.7 V
Output Short-Circuit Duration to GND Indefinite
Storage Temperature Range
RM, R Packages −65°C to +150°C
Operating Temperature Range −40°C to +125°C
Junction Temperature Range
RM, R Packages −65°C to +150°C
Lead Temperature Range (Soldering, 10 sec) 300°C
Table 5. Thermal Resistance
Package Type θJA θ
JC Unit
8-Lead MSOP (RM) 210 45 °C/W
8-Lead SOIC_N (R) 158 43 °C/W
POWER SEQUENCING
The op amp supplies must be established simultaneously with,
or before, any input signals are applied. If this is not possible,
the input current must be limited to 10 mA.
ESD CAUTION
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.
AD8676 Data Sheet
Rev. C | Page 6 of 12
TYPICAL PERFORMANCE CHARACTERISTICS
±15 V and ±5 V, TA = 25°C, unless otherwise specified.
10
9
8
7
6
5
4
3
2
1
0
1 10 100 1k 10k 100k
FREQUENCY (Hz)
VOLTAGE NOISE DENSITY (nV/ Hz)
06487-003
Figure 3. Voltage Noise Density vs. Frequency
90
0
–100 –80 –60 –40 –20 0 20 40 60 80 100
VOS (µV)
NUMBER OF AMPLIFIERS
80
70
60
50
40
30
20
10
06487-004
Figure 4. Input Offset Voltage Distribution
25
20
15
10
5
0
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
1.00
0.65
0.70
0.75
0.80
0.85
0.90
0.95
T
C
V
OS
(µV/°C)
NUMBER OF AMPLIFIERS
06487-005
Figure 5. TCVOS Distribution
150
–150
–40
TEMPERATURE (°C)
V
OS
(µV)
100
50
0
–50
–100
–20 120100806040200
06487-106
V
S
= ±15V
TYPICAL
Figure 6. Offset Voltage vs. Temperature
350
300
250
200
150
10
50
0
IB (nA)
NUMBER OF AMPLIFIERS
2.01.61.20.80.40–2.0 –1.6 –1.2 –0.8 –0.4
06487-107
Figure 7. Input Bias Current, VSY = ±15 V
2.01.61.20.80.40–2.0 –1.6 –1.2 –0.8 –0.4
350
300
250
200
150
10
50
0
IB (nA)
NUMBER OF AMPLIFIERS
06487-108
Figure 8. Input Bias Current, VSY = ±5 V
Data Sheet AD8676
Rev. C | Page 7 of 12
±15 V and ±5 V, TA = 25°C, unless otherwise specified.
5
–5
–4
–3
–2
–1
0
1
2
3
4
–40
TEMPERATURE (°C)
I
B
(nA)
–20 120100806040200
06487-109
V
S
= ±15V
V
S
= ±5V
Figure 9. Input Bias Current vs. Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
353025201510
06487-110
Figure 10. Supply Current vs. Total Supply Voltage
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–40
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
–20 120100806040200
06487-111
V
S
= ±15V
V
S
= ±5V
Figure 11. Supply Current vs. Temperature
100
120
100
80
40
60
20
–40
–20
0
–80
–100
–60
–120
10k1k 100k 10M1M 100M
FREQUENCY (Hz)
GAIN (dB)
R
L
= 2kΩ
C
L
= 35pF
θ
M
= 55.2°
GAIN
PHASE
180
0
45
–45
–90
–135
90
135
–180
PHASE MARGIN (Degrees)
06487-012
Figure 12. Gain and Phase vs. Frequency
60
50
40
30
20
10
0
–10
–20
–30
–40
1k 10k 100k
G = 1
G = 10
G = 100
1M 10M 100M
FREQUENCY (Hz)
CLOSED-LOOP GAIN (dB)
06487-013
Figure 13. Closed-Loop Gain vs. Frequency
70
60
50
40
30
20
10
0
1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
Z
OUT
(Ω)
A
VO
= 100
A
VO
= 10
A
VO
= 1
06487-014
Figure 14. ZOUT vs. Frequency
AD8676 Data Sheet
Rev. C | Page 8 of 12
±15 V and ±5 V, TA = 25°C, unless otherwise specified.
15
10
5
0
–5
–10
–15
TIME (10µs/DIV)
VOLTAGE (V)
V
IN
= ±10V
R
L
= 2kΩ
A
V
= +1
06487-015
Figure 15. Large Signal Transient Response, VSY = ±15 V
4
3
2
1
0
–1
–3
–2
–4
TIME (10µs/DIV)
VOLTAGE (V)
V
IN
= ±3.5V
R
L
= 2kΩ
A
V
= +1
06487-016
Figure 16. Large Signal Transient Response, VSY = ±5 V
70
60
50
40
30
20
10
0
1 10 100 1k 10k 100k
CAPACITANCE (pF)
OVERSHOOT (%)
A
V
= +1
V
IN
= 100mV p-p
+OS
–OS
06487-017
Figure 17. Small Signal Overshoot vs. Load Capacitance
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–4 1 6 11 16 21 26 31 36
TIME (µs)
INPUT VOLTAGE (V)
50
40
30
20
10
0
–10
–30
–20
OUTPUT VOLTAGE (V)
V
IN
= 200mV p-p
A
VO
= –100
R
L
= 10kΩ
V
IN
V
OUT
06487-018
Figure 18. Positive Overvoltage Recovery
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–4 1 6 11 16 21 26 31 36
TIME (µs)
INPUT VOLTAGE (V)
50
40
30
20
10
0
–10
–20
–30
OUTPUT VOLTAGE (V)
V
IN
= 200mV p-p
A
VO
= –100
R
L
= 10kΩ
V
IN
V
OUT
06487-019
Figure 19. Negative Overvoltage Recovery
180
160
140
120
100
80
60
40
20
0
–20
10 100 10k1k 100k 10M1M 100M
FREQUENCY (Hz)
CMRR (dB)
06487-020
Figure 20. CMRR vs. Frequency
Data Sheet AD8676
Rev. C | Page 9 of 12
±15 V and ±5 V, TA = 25°C, unless otherwise specified.
160
140
120
100
60
80
20
40
0
–20
10 100 10k1k 100k 10M1M 100M
FREQUENCY (Hz)
POWER SUPPLY REJECTION RATIO (dB)
–PSRR
+PSRR
06487-021
Figure 21. Power Supply Rejection Ratio vs. Frequency
126
112
114
116
118
120
122
124
–40
TEMPERATURE (°C)
POWER SUPPLY REJECTION RATIO (dB)
–20 120100806040200
06487-122
Figure 22. Power Supply Rejection Ratio vs. Temperature
0.06
0.04
0.02
0
–0.02
–0.04
–0.06
012 4376589
TIME (s)
NOISE (µV)
10
0
6487-023
Figure 23. Voltage Noise (0.1 Hz to 10 Hz)
1000
100
10
1
0.001 0.01 0.1 1 10 100
LOAD CURRENT (mA)
V
S
– V
OUT
(mV)
SOURCE
SINK
06487-024
Figure 24. Output Saturation Voltage vs. Output Load Current
15.0
14.9
14.8
14.7
14.6
14.5
14.4
–40
TEMPERATURE (°C)
HIGH OUTPUT VOLTAGE (V)
–20 120100806040200
06487-125
R
L
= 2kΩ
V
S
= ±15V
Figure 25. High Output Voltage, VOH vs. Temperature, VS = ±15 V
5.00
4.95
4.90
4.85
4.80
4.75
–40
TEMPERATURE (°C)
HIGH OUTPUT VOLTAGE (V)
–20 120100806040200
06487-225
R
L
= 2kΩ
V
S
= ±5V
Figure 26. High Output Voltage, VOH vs. Temperature, VS = ±5 V
AD8676 Data Sheet
Rev. C | Page 10 of 12
±15 V and ±5 V, TA = 25°C, unless otherwise specified.
–
14.70
–15.00
–14.95
–14.90
–14.85
–14.80
–14.75
–40
TEMPERATURE (°C)
LOW OUTPUT VOLTAGE (V)
–20 120100806040200
06487-126
RL = 2kΩ
VS = ±15V
Figure 27. Low Output Voltage, VOL vs. Temperature, VS = ±15 V
–
4.93
–4.94
–4.95
–4.96
–4.97
–4.98
–4.99
–5.00
–40
TEMPERATURE (°C)
LOW OUTPUT VOLTAGE (V)
–20 120100806040200
06487-226
RL = 2kΩ
VS = ±5V
Figure 28. Low Output Voltage, VOL vs. Temperature, VS = ±5 V
Data Sheet AD8676
Rev. C | Page 11 of 12
OUTLINE DIMENSIONS
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COMPLIANT TO JEDEC STANDARDS MS-012-A A
012407-A
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
0.50 (0.0196)
0.25 (0.0099) 45°
8°
0°
1.75 (0.0688)
1.35 (0.0532)
SEATING
PLANE
0.25 (0.0098)
0.10 (0.0040)
4
1
85
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
6.20 (0.2441)
5.80 (0.2284)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
Figure 29. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters and (inches)
COMPLIANT TO JEDEC STANDARDS MO-187-AA
100709-B
6°
0°
0.80
0.55
0.40
4
8
1
5
0.65 BSC
0.40
0.25
1.10 MAX
3.20
3.00
2.80
COPLANARITY
0.10
0.23
0.09
3.20
3.00
2.80
5.15
4.90
4.65
PIN 1
IDENTIFIER
15° MAX
0.95
0.85
0.75
0.15
0.05
Figure 30. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
ORDERING GUIDE
Model1 Temperature Range Package Description Package Option Branding
AD8676ARMZ −40°C to +125°C 8-Lead Mini Small Outline Package [MSOP] RM-8 A13
AD8676ARMZ-REEL −40°C to +125°C 8-Lead Mini Small Outline Package [MSOP] RM-8 A13
AD8676ARZ −40°C to +125°C 8-Lead Standard Small Outline Package [SOIC_N] R-8
AD8676ARZ-REEL −40°C to +125°C 8-Lead Standard Small Outline Package [SOIC_N] R-8
AD8676ARZ-REEL7 −40°C to +125°C 8-Lead Standard Small Outline Package [SOIC_N] R-8
AD8676BRMZ −40°C to +125°C 8-Lead Mini Small Outline Package [MSOP] RM-8 A1L
AD8676BRMZ-REEL −40°C to +125°C 8-Lead Mini Small Outline Package [MSOP] RM-8 A1L
AD8676BRZ −40°C to +125°C 8-Lead Standard Small Outline Package [SOIC_N] R-8
AD8676BRZ-REEL −40°C to +125°C 8-Lead Standard Small Outline Package [SOIC_N] R-8
AD8676BRZ-REEL7 −40°C to +125°C 8-Lead Standard Small Outline Package [SOIC_N] R-8
1 Z = RoHs Compliant Part.
