AD AD8675ARMZ-R2 36 v precision, 2.8 nv/hz rail-to-rail output op amp Datasheet

36 V Precision, 2.8 nV/√Hz
Rail-to-Rail Output Op Amp
AD8675
APPLICATIONS
Precision instrumentation
PLL filters
Laser diode control loops
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
PIN CONFIGURATIONS
NULL 1
–IN 2
AD8675
8
NULL
7
V+
+IN 3
6 OUT
TOP VIEW
V– 4 (Not to Scale) 5 NC
NC = NO CONNECT
05564-001
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
Figure 1. 8-Lead SOIC_N (R-8)
NULL 1
–IN 2
AD8675
+IN 3
TOP VIEW
(Not to Scale)
V– 4
8
NULL
7
V+
6
OUT
5
NC
NC = NO CONNECT
05564-002
FEATURES
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, combined 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 μV 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 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 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, leadfree packages. MSOP packaged devices are only available in tape
and reel format.
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.
AD8675
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ............................................................5
Applications....................................................................................... 1
Thermal Resistance .......................................................................5
Pin Configurations ........................................................................... 1
ESD Caution...................................................................................5
General Description ......................................................................... 1
Typical Performance Characteristics ..............................................6
Revision History ............................................................................... 2
Outline Dimensions ....................................................................... 11
Specifications..................................................................................... 3
Ordering Guide .......................................................................... 11
Electrical Specifications............................................................... 3
REVISION HISTORY
10/05—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
AD8675
SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
VS = ±5.0 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Symbol
Conditions
Min
VOS
−40°C ≤ TA ≤ +125°C
Input Bias Current
IB
−40°C ≤ TA ≤ +125°C
Input Offset Current
IOS
−40°C ≤ TA ≤ +125°C
Input Voltage Range
Common-Mode Rejection Ratio
CMRR
Open Loop Gain
AVO
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
ΔVOS/ΔT
VCM = −3.5 V to +3.5 V
−40°C ≤ TA ≤ +125°C
RL = 2 kΩ to ground,
VO = −4.0 V to +4.0 V
−40°C ≤ TA ≤ +125°C
−40°C ≤ TA ≤ +125°C
−2
−5.5
−1
−2.8
−3.5
105
105
1000
700
Max
Unit
10
12
0.5
−2
0.1
0.1
75
240
2
5.5
1
2.8
3.5
μV
130
130
2000
1250
0.2
0.6
V/mV
μV/°C
RL = 2 kΩ to ground
−40°C ≤ TA ≤ +125°C
Output Voltage Low
VOL
RL = 2 kΩ to ground
−40°C ≤ TA ≤ +125°C
Short-Circuit Limit
ISC
40
mA
Output Current
IO
±20
mA
140
140
2.3
2.7
dB
dB
mA
mA
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
PSRR
ISY
VS = ±5.0 V to ±15.0 V
−40°C ≤ TA ≤ +125°C
VO = 0 V
−40°C ≤ TA ≤ +125°C
4.90
4.85
nA
nA
nA
nA
V
dB
dB
V/mV
VOH
POWER SUPPLY
Power Supply Rejection Ratio
4.86
4.82
Typ
−4.91
−4.91
120
120
V
V
−4.86
−4.82
2.7
3.4
V
V
SR
GBP
RL = 2 kΩ
2.5
10
V/μs
MHz
en p-p
en
in
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 Hz
0.1
2.8
0.3
μV p-p
nV/√Hz
pA/√Hz
Rev. 0 | Page 3 of 12
AD8675
VS = ±15 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Symbol
Conditions
Min
VOS
−40°C ≤ TA ≤ +125°C
Input Bias Current
IB
−40°C ≤ TA ≤ +125°C
Input Offset Current
IOS
−40°C ≤ TA ≤ +125°C
Input Voltage Range
Common-Mode Rejection Ratio
CMRR
Open Loop Gain
AVO
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
ΔVOS/ΔT
VOH
VCM = −12.5 V to 12.5 V
−40°C ≤ TA ≤ +125°C
RL = 2 kΩ to ground,
VO = −14.0 V to 14.0 V
−40°C ≤ TA ≤ +125°C
−40°C ≤ TA ≤ +125°C
SOIC RL = 2 kΩ to ground
MSOP
SOIC −40°C ≤ TA ≤ +125°C
MSOP −40°C ≤ TA ≤ +125°C
RL = 2 kΩ to ground
−40°C ≤ TA ≤ +125°C
−2
−4.5
−1
−2.8
−13.5
114
114
1500
700
14.75
14.67
14.69
14.3
Typ
Max
Units
10
12
0.5
1
0.1
0.1
75
240
2
4.5
1
2.8
13.5
μV
130
130
4000
1700
0.2
14.8
14.78
14.75
14.66
−14.85
−14.78
Output Voltage Low
VOL
Short-Circuit Limit
ISC
40
Output Current
IO
±20
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
PSRR
ISY
VS = ±5.0 V to ±15.0 V
−40°C ≤ TA ≤ +125°C
VO = 0 V
−40°C ≤ TA ≤ +125°C
120
120
140
140
2.5
2.9
0.6
−14.75
−14.69
2.9
3.8
nA
nA
nA
nA
V
dB
dB
V/mV
V/mV
μV/°C
V
V
V
V
V
V
V
V
mA
mA
mA
mA
dB
dB
mA
mA
SR
GBP
RL =10 kΩ
2.5
10
V/μs
MHz
en p-p
en
in
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 Hz
0.1
2.8
0.3
μVp-p
nV/√Hz
pA/√Hz
Rev. 0 | Page 4 of 12
AD8675
ABSOLUTE MAXIMUM RATINGS
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.
Table 3.
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage
Output Short-Circuit Duration to GND
Storage Temperature Range
RM, R Packages
Operating Temperature Range
Junction Temperature Range
RM, R Packages
Lead Temperature Range (Soldering, 10 sec)
Rating
±18 V
±V supply
±0.7 V
Indefinite
−65°C to +150°C
−40°C to +125°C
THERMAL RESISTANCE
−65°C to +150°C
+300°C
Package Type
8-Lead MSOP (RM)
8-Lead SOIC_N (R)
Table 4. Thermal Resistance
θJA
210
158
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.
Rev. 0 | Page 5 of 12
θJC
45
43
Unit
°C/W
°C/W
AD8675
TYPICAL PERFORMANCE CHARACTERISTICS
±15 V and ±5 V, TA = 25°C, unless otherwise specified.
10
150
100
OFFSET VOLTAGE (μV)
8
7
6
5
4
3
50
0
–50
–100
2
1
0
1
10
100
1k
10k
05564-005
–150
05564-011
VOLTAGE NOISE DENSITY (nV/ Hz)
9
–200
–40
100k
FREQUENCY (Hz)
25
125
TEMPERATURE (°C)
Figure 3. Voltage Noise Density vs. Frequency
Figure 6. Offset Voltage vs. Temperature
50
120
45
100
NUMBER OF AMPLIFIERS
35
30
25
20
15
10
80
60
40
05564-016
20
0
50
45
40
35
30
25
20
15
5
10
0
–5
–10
–15
–20
–25
–30
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
5
05564-008
NUMBER OF AMPLIFIERS
40
OFFSET VOLTAGE (μV)
IB (nA)
Figure 4. Input Offset Voltage Distribution
Figure 7. Input Bias Current, VSY = ±15 V
25
160
140
NUMBER OF AMPLIFIERS
15
10
120
100
80
60
40
5
05564-027
05564-014
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
0.75
0.80
0.85
0.90
0.95
1.00
0.50
0.55
0.60
0.65
0.70
0.40
0.45
0
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
NUMBER OF AMPLIFIERS
20
TCVOS (μV/°C)
IB (nA)
Figure 5. TcVos
Figure 8. Input Bias Current, VSY = ±5 V
Rev. 0 | Page 6 of 12
AD8675
120
4
100
180
RL = 2kΩ
CL = 35pF
θM = 55.2
GAIN
80
3
120
2
GAIN (dB)
VSY = ±5V
1
IB (nA)
PHASE
40
0
VSY = ±15V
–1
60
20
0
0
–20
–60
–40
–2
PHASE MARGIN (Degrees)
60
–60
–3
–120
05564-007
–80
–4
–5
–40
–20
0
20
40
60
80
100
–100
–120
100
120
1k
10k
TEMPERATURE (°C)
100k
1M
10M
–180
100M
FREQUENCY (Hz)
Figure 9. Input Bias Current vs. Temperature
Figure 12. Gain and Phase vs. Frequency
3.0
60
50
40
CLOSED-LOOP GAIN (dB)
2.0
1.5
1.0
G = 100
30
20
G = 10
10
0
G=1
–10
–20
05564-009
0.5
0
5
10
15
20
25
30
05564-030
SUPPLY CURRENT (mA)
2.5
–30
–40
1k
35
10k
SUPPLY VOLTAGE (V)
100k
1M
10M
100M
FREQUENCY (Hz)
Figure 10. Supply Current vs. Total Supply Voltage
Figure 13. Closed-Loop Gain vs. Frequency
3.5
70
60
3.0
VS = ±15V
50
ZOUT (Ω)
VS = ±5V
2.0
1.5
AVO = 100
40
30
1.0
20
0.5
10
AVO = 10
0
–40
–20
0
20
40
60
80
100
0
1k
120
TEMPERATURE (°C)
05564-015
AVO = 1
05564-019
ISY (mA)
2.5
10k
100k
1M
FREQUENCY (Hz)
Figure 11. Supply Current vs. Temperature
Figure 14. ZOUT vs. Frequency
Rev. 0 | Page 7 of 12
10M
100M
05564-018
5
AD8675
0.1
VIN = ±11V
RL = 2kΩ
AV = +1
0
–5
40
–0.1
30
–0.2
20
–0.3
10
–0
–0.4
VOUT
–0.5
–10
–0.6
VIN = 200mV p-p
–20
AVO = –100
RL = 10kΩ
05564-020
–10
–15
–0.7
–4
1
6
11
TIME (10μs/DIV)
21
26
31
–30
36
TIME (μs)
Figure 15. Large Signal Transient Response, VSY = ±15 V
Figure 18. Positive Overvoltage Recovery
0.3
VIN = ±3.5V
RL = 2kΩ
AV = +1
3
50
VIN = 200mV p-p
AVO = –100
40
RL = 10kΩ
0.2
2
INPUT VOLTAGE (V)
0.1
1
0
–1
30
VIN
0
20
–0.1
10
–0.2
0
VOUT
–0.3
–10
–3
–0.4
–20
05564-028
–2
–4
OUTPUT VOLTAGE (V)
4
VOLTAGE (V)
16
–0.5
–4
1
6
11
TIME (10μs/DIV)
16
21
26
31
05564-003
VOLTAGE (V)
5
0
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
10
50
VIN
05564-004
15
–30
36
TIME (μs)
Figure 16. Large Signal Transient Response, VSY = ±5 V
Figure 19. Negative Overvoltage Recovery
70
180
AV = +1
VIN = 100mV p-p
160
60
140
CMRR (dB)
120
40
+OS
30
100
80
60
–OS
40
20
0
1
10
100
1k
10k
05564-029
20
10
05564-012
OVERSHOOT (%)
50
0
–20
10
100k
CAPACITANCE (pF)
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 17. Small Signal Overshoot vs. Load Capacitance
Figure 20. CMRR vs. Frequency
Rev. 0 | Page 8 of 12
10M
100M
AD8675
160
1000
TA = 25°C
140
120
SOURCE
–PSRR
VS – VOUT (mV)
PSRR (dB)
100
80
60
+PSRR
100
10
40
SINK
0
–20
10
100
1k
10k
100k
1M
10M
05564-010
05564-022
20
1
0.001
100M
0.01
0.1
FREQUENCY (Hz)
1
10
100
LOAD CURRENT (mA)
Figure 21. PSRR vs. Frequency
Figure 24. Output Saturation Voltage vs. Output Current
148
14.86
147
14.84
146
14.82
145
14.80
VSY = ±15V
RL = 2kΩ
144
143
14.78
14.76
14.74
141
14.72
140
–40
05564-023
142
–20
0
20
40
60
80
100
14.70
–40
120
05564-032
+SWING (V)
PSRR (dB)
VOH
–20
0
TEMPERATURE (°C)
20
40
60
80
100
120
TEMPERATURE (°C)
Figure 22. Power Supply Rejection Ratio vs. Temperature
Figure 25. Swing vs. Temperature, VOH
0.06
–14.70
–14.75
0.02
–14.80
0
VOL
–14.85
–0.02
–14.90
–0.04
–14.95
–0.06
0
1
2
3
4
5
6
7
8
9
–15.00
–40
10
TIME (s)
05564-033
–SWING (V)
0.04
05564-021
NOISE (µV)
VSY = ±15V
RL = 2kΩ
–20
0
20
40
60
80
TEMPERATURE (°C)
Figure 23. Voltage Noise (0.1 Hz to 10 Hz)
Figure 26. Swing vs. Temperature, VOL
Rev. 0 | Page 9 of 12
100
120
AD8675
100kΩ
V+
1
2
7
AD8675
INPUT
+
8
3
4
6
OUTPUT
VOS TRIM RANGE IS
TYPICALLY ±3.5mV
V–
Figure 27. Optional Offset Nulling Circuit
Rev. 0 | Page 10 of 12
05564-031
–
AD8675
OUTLINE DIMENSIONS
3.20
3.00
2.80
5.00 (0.1968)
4.80 (0.1890)
8
4.00 (0.1574)
3.80 (0.1497) 1
5
6.20 (0.2440)
4 5.80 (0.2284)
1.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0040)
8
3.20
3.00
2.80
1.75 (0.0688)
1.35 (0.0532)
1
0.50 (0.0196)
× 45°
0.25 (0.0099)
5.15
4.90
4.65
5
4
PIN 1
0.65 BSC
0.51 (0.0201)
COPLANARITY
SEATING 0.31 (0.0122)
0.10
PLANE
0.95
0.85
0.75
8°
0.25 (0.0098) 0° 1.27 (0.0500)
0.40 (0.0157)
0.17 (0.0067)
COMPLIANT TO JEDEC STANDARDS MS-012-AA
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
1.10 MAX
0.15
0.00
0.38
0.22
COPLANARITY
0.10
0.23
0.08
0.80
0.60
0.40
8°
0°
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MO-187-AA
Figure 28. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters and (inches)
Figure 29. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
ORDERING GUIDE
Model
AD8675ARMZ-R2 1
AD8675ARMZ-REEL1
AD8675ARZ1
AD8675ARZ-REEL1
AD8675ARZ-REEL71
1
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
8-Lead Mini Small Outline Package [MSOP]
8-Lead Mini Small Outline Package [MSOP]
8-Lead Standard Small Outline Package [SOIC_N]
8-Lead Standard Small Outline Package [SOIC_N]
8-Lead Standard Small Outline Package [SOIC_N]
Z = Pb-free part.
Rev. 0 | Page 11 of 12
Package Option
RM-8
RM-8
R-8
R-8
R-8
Branding
A08
A08
AD8675
NOTES
© 2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05564-0-10/05(0)
Rev. 0 | Page 12 of 12
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