36 V Precision, 2.8 nV/√Hz
Rail-to-Rail Output Op Amp
AD8675
Rev. 0
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.
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 © 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Very low voltage noise 2.8 nV/√Hz
Rail-to-rail output swing
Low input bias current: 2 nA maximum
Very low offset voltage: 75 μV maximum
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
NULL
1
–IN
2
+IN
3
V–
4
NULL
8
V+
7
OUT
6
NC
5
NC = NO CONNECT
AD8675
TOP VI EW
(Not to Scal e)
05564-001
Figure 1. 8-Lead SOIC_N (R-8)
NULL
1
–IN
2
+IN
3
V–
4
NULL
8
V+
7
OUT
6
NC
5
NC = NO CO NNE CT
AD8675
TOP VI EW
(No t t o S cale)
05564-002
Figure 2. 8-Lead MSOP (RM-8)
GENERAL DESCRIPTION
The AD8675 precision operational amplifier has ultralow offset,
drift, and voltage noise combined with very low input bias
currents over the full operating temperature range. The AD8675
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 AD8675 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 AD8675 has very low input bias
current and low input current noise.
With typical offset voltage of only 10 µV, offset drift of 0.2 µV/°C,
and noise of only 0.10 V p-p (0.1 Hz to 10 Hz), the AD8675 is
perfectly suited for applications where large error sources
cannot be tolerated. For applications with even lower offset
tolerances, the proprietary nulling capability allows a combination
of both device and system offset errors up to 3.5 mV (referred
to the input) to be compensated externally. Unlike previous
circuits, the AD8675 accommodates this adjustment without
adversely affecting the offset drift, CMRR, and PSRR of the
amplifier. Precision instrumentation, PLL, and other precision
filter circuits, position and pressure sensors, medical instru-
mentation, 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 AD8675 to
maximize SNR and dynamic range.
The smaller packages and low power consumption afforded by
the AD8675 allow maximum channel density or minimum
board size for space-critical equipment.
The AD8675 is specified for the extended industrial temperature
range (−40°C to +125°C). The AD8675 amplifier is available in
the tiny MSOP-8, and the popular 8-lead, narrow SOIC, lead-
free packages. MSOP packaged devices are only available in tape
and reel format.
AD8675
Rev. 0 | 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
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
REVISION HISTORY
10/05—Revision 0: Initial Version
AD8675
Rev. 0 | Page 3 of 12
SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
VS = ±5.0 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 10 75 μV
−40°C ≤ TA ≤ +125°C 12 240
Input Bias Current IB −2 0.5 2 nA
−40°C ≤ TA ≤ +125°C −5.5 −2 5.5 nA
Input Offset Current IOS −1 0.1 1 nA
−40°C ≤ TA ≤ +125°C −2.8 0.1 2.8 nA
Input Voltage Range −3.5 3.5 V
Common-Mode Rejection Ratio CMRR VCM = −3.5 V to +3.5 V 105 130 dB
−40°C ≤ TA ≤ +125°C 105 130 dB
Open Loop Gain AVO R
L = 2 kΩ to ground, 1000 2000 V/mV
V
O = −4.0 V to +4.0 V
−40°C ≤ TA ≤ +125°C 700 1250 V/mV
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.2 0.6 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH R
L = 2 kΩ to ground 4.86 4.90 V
−40°C ≤ TA ≤ +125°C 4.82 4.85 V
Output Voltage Low VOL R
L = 2 kΩ to ground −4.91 −4.86 V
−40°C ≤ TA ≤ +125°C −4.91 −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 120 140 dB
−40°C ≤ TA ≤ +125°C 120 140 dB
Supply Current/Amplifier ISY V
O = 0 V 2.3 2.7 mA
−40°C ≤ TA ≤ +125°C 2.7 3.4 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
AD8675
Rev. 0 | Page 4 of 12
VS = ±15 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified.
Table 2.
Parameter Symbol Conditions Min Typ Max Units
INPUT CHARACTERISTICS
Offset Voltage VOS 10 75 μV
−40°C ≤ TA ≤ +125°C 12 240
Input Bias Current IB −2 0.5 2 nA
−40°C ≤ TA ≤ +125°C −4.5 1 4.5 nA
Input Offset Current IOS −1 0.1 1 nA
−40°C ≤ TA ≤ +125°C −2.8 0.1 2.8 nA
Input Voltage Range −13.5 13.5 V
Common-Mode Rejection Ratio CMRR VCM = −12.5 V to 12.5 V 114 130 dB
−40°C ≤ TA ≤ +125°C 114 130 dB
Open Loop Gain AVO R
L = 2 kΩ to ground, 1500 4000 V/mV
V
O = −14.0 V to 14.0 V
−40°C ≤ TA ≤ +125°C 700 1700 V/mV
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.2 0.6 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH SOIC RL = 2 kΩ to ground 14.75 14.8 V
MSOP 14.67 14.78 V
SOIC −40°C ≤ TA ≤ +125°C 14.69 14.75 V
MSOP −40°C ≤ TA ≤ +125°C 14.3 14.66 V
Output Voltage Low VOL R
L = 2 kΩ to ground −14.85 −14.75 V
−40°C ≤ TA ≤ +125°C −14.78 −14.69 V
V
V
Short-Circuit Limit ISC 40 mA
mA
Output Current IO ±20 mA
mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = ±5.0 V to ±15.0 V 120 140 dB
−40°C ≤ TA ≤ +125°C 120 140 dB
Supply Current/Amplifier ISY V
O = 0 V 2.5 2.9 mA
−40°C ≤ TA ≤ +125°C 2.9 3.8 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 μVp-p
Voltage Noise Density en f = 1 kHz 2.8 nV/√Hz
Current Noise Density in f = 10 Hz 0.3 pA/√Hz
AD8675
Rev. 0 | Page 5 of 12
ABSOLUTE MAXIMUM RATINGS
Tab l e 3.
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
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.
THERMAL RESISTANCE
Table 4. 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
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
AD8675
Rev. 0 | 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
01 10 100 1k 10k 100k
05564-011
FRE QUENCY (Hz)
VOLTAGE NO ISE DE NSITY (n V/ Hz)
Figure 3. Voltage Noise Density vs. Frequency
50
45
40
25
30
35
20
15
10
5
0
–30
–25
–20
–15
–10
–5
0
5
10
15
20
25
30
35
40
45
50
05564-016
OFFSET VOLTAGE (μV)
NUMBER O F AMP LI F IERS
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
05564-014
T
C
V
OS
(μV/°C)
NUMBER O F AMP LI F IERS
Figure 5. TcVos
150
100
50
0
–100
–50
–150
–200 –40 25 125
05564-005
TEMPERATURE (°C)
OFFSET VOLTAGE (μV)
Figure 6. Offset Voltage vs. Temperature
120
100
80
60
40
20
0
–0.7
–0.6
–0.6
–0.5
–0.5
–0.4
–0.4
–0.3
–0.3
–0.2
–0.2
–0.1
–0.1
0
0.1
0.1
0.2
0.2
0.3
0.3
0.3
0.4
0.4
0.5
0.5
0.6
0.6
05564-008
I
B
(nA)
NUMBER O F AMP LI F IERS
Figure 7. Input Bias Current, VSY = ±15 V
160
120
140
100
80
60
40
20
0
–0.7
–0.6
–0.6
–0.5
–0.5
–0.4
–0.4
–0.3
–0.3
–0.2
–0.2
–0.1
–0.1
0
0.1
0.1
0.2
0.2
0.3
0.3
0.3
0.4
0.4
0.5
0.5
0.6
0.6
05564-027
I
B
(nA)
NUMBER O F AMP LI F IERS
Figure 8. Input Bias Current, VSY = ±5 V
AD8675
Rev. 0 | Page 7 of 12
5
4
3
2
1
0
–1
–2
–3
–4
–5
–40 –20 0 20 40 60 80 100 120
05564-007
TEMPERATURE (°C)
I
B
(nA)
V
SY
=±5V
V
SY
=±15V
Figure 9. Input Bias Current vs. Temperature
3.0
2.5
2.0
1.5
1.0
0.5
05 101520253035
05564-009
SUPPLY VOLTAG E (V)
SUPP LY CURRENT (mA)
Figure 10. Supply Current vs. Total Supply Voltage
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–40 –20 0 20 40 60 80 100 120
05564-019
TEMPERATURE (°C)
I
SY
(mA)
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
05564-018
FRE Q UENC Y ( Hz )
GAIN (dB)
R
L
= 2kΩ
C
L
= 35pF
θ
M
= 55.2
GAIN
PHASE
180
120
60
–60
0
–120
–180
PHASE M ARGI N ( Degrees)
Figure 12. Gain and Phase vs. Frequency
60
50
40
30
20
10
0
–10
–20
–30
–401k 10k 100k
G = 1
G = 10
G = 100
1M 10M 100M
05564-030
FRE QUENCY (Hz)
CLOSED-LOOP GAIN (dB)
Figure 13. Closed-Loop Gain vs. Frequency
70
60
50
40
30
20
10
01k 10k 100k 1M 10M 100M
05564-015
FRE QUENCY (Hz)
Z
OUT
(
Ω
)
A
VO
= 100
A
VO
= 10
A
VO
= 1
Figure 14. ZOUT vs. Frequency
AD8675
Rev. 0 | Page 8 of 12
15
10
5
0
–5
–10
–15
05564-020
TIME (10μs/DIV)
VOLTAGE (V)
V
IN
= ±11V
R
L
= 2kΩ
A
V
= +1
Figure 15. Large Signal Transient Response, VSY = ±15 V
4
3
2
1
0
–1
–3
–2
–4
05564-028
TIME (10μs/DIV)
VOLTAGE (V)
V
IN
= ±3.5V
R
L
= 2kΩ
A
V
= +1
Figure 16. Large Signal Transient Response, VSY = ±5 V
70
60
50
40
30
20
10
01 10 100 1k 10k 100k
05564-012
CAPACITANCE (pF )
OVERSHOOT (%)
A
V
= +1
V
IN
= 100mV p - p
+OS
–OS
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
05564-004
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
= 10k Ω
V
IN
V
OUT
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
05564-003
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
= 10k Ω
V
IN
V
OUT
Figure 19. Negative Overvoltage Recovery
180
160
140
120
100
80
60
40
20
0
–2010 100 10k1k 100k 10M1M 100M
05564-029
FRE QUENCY (Hz)
CMRR (d B)
Figure 20. CMRR vs. Frequency
AD8675
Rev. 0 | Page 9 of 12
160
140
120
100
60
80
20
40
0
–2010 100 10k1k 100k 10M1M 100M
05564-022
FRE QUENCY (Hz)
PSRR (dB)
–PSRR
+PSRR
Figure 21. PSRR vs. Frequency
148
147
146
145
144
143
142
141
140
–40 –20 0 20 40 60 80 100 120
05564-023
TEMPERATURE (°C)
PSRR (dB)
Figure 22. Power Supply Rejection Ratio vs. Temperature
0.06
0.04
0.02
0
–0.02
–0.04
–0.06 012 4376589
10
05564-021
TIME (s)
NOISE (µV)
Figure 23. Voltage Noise (0.1 Hz to 10 Hz)
1000
100
10
1
0.001 0.01 0.1 1 10 100
05564-010
LOAD CURRENT ( mA)
V
S
– V
OUT
(mV)
T
A
= 25°C
SOURCE
SINK
Figure 24. Output Saturation Voltage vs. Output Current
14.86
14.84
14.82
14.80
14.78
14.76
14.74
14.72
14.70
–40 –20 0 20 40 60 80 100 120
05564-032
TEM P ERATURE (°C)
+SWI NG (V )
V
OH
V
SY
= ±15V
R
L
= 2kΩ
Figure 25. Swing vs. Temperature, VOH
–
14.70
–14.75
–14.80
–14.85
–14.90
–14.95
–15.00
–40 –20 0 20 40 60 80 100 120
05564-033
TEMPERATURE (°C)
–SWI NG ( V)
VSY = ±15V
RL =2kΩ
VOL
Figure 26. Swing vs. Temperature, VOL
AD8675
Rev. 0 | Page 10 of 12
18
4
7
3
6
2AD8675
INPU
T
OUTPUT
V+
V
OS
TRIM RANGE IS
TYPICALLY ±3. 5mV
100k
Ω
V–
–
+
05564-031
Figure 27. Optional Offset Nulling Circuit
AD8675
Rev. 0 | Page 11 of 12
OUTLINE DIMENSIONS
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)
41
85
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
6.20 (0.2440)
5.80 (0.2284)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
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-AA
Figure 28. 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
0.80
0.60
0.40
8°
0°
4
8
1
5
PIN 1 0.65 BSC
SEATING
PLANE
0.38
0.22
1.10 MAX
3.20
3.00
2.80
COPLANARITY
0.10
0.23
0.08
3.20
3.00
2.80
5.15
4.90
4.65
0.15
0.00
0.95
0.85
0.75
Figure 29. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
ORDERING GUIDE
Model Temperature Range Package Description Package Option Branding
AD8675ARMZ-R21−40°C to +125°C 8-Lead Mini Small Outline Package [MSOP] RM-8 A08
AD8675ARMZ-REEL1−40°C to +125°C 8-Lead Mini Small Outline Package [MSOP] RM-8 A08
AD8675ARZ1−40°C to +125°C 8-Lead Standard Small Outline Package [SOIC_N] R-8
AD8675ARZ-REEL1−40°C to +125°C 8-Lead Standard Small Outline Package [SOIC_N] R-8
AD8675ARZ-REEL71−40°C to +125°C 8-Lead Standard Small Outline Package [SOIC_N] R-8
1 Z = Pb-free part.
AD8675
Rev. 0 | Page 12 of 12
NOTES
© 2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05564-0-10/05(0)
