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36 V Precision, 2.8 nV/Hz Rail-to-Rail Output Op Amp AD8675
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 V maximum Low input offset drift: 0.6 V/C maximum Very high gain: 120 dB Wide bandwidth: 10 MHz typical 5 V to 18 V operation
PIN CONFIGURATIONS
NULL 1 -IN 2 +IN 3
8
NULL V+
AD8675
7
NC = NO CONNECT
Figure 1. 8-Lead SOIC_N (R-8)
NULL 1 -IN 2 +IN 3 V- 4
8
APPLICATIONS
Precision instrumentation PLL filters Laser diode control loops Strain gage amplifiers Medical instrumentation Thermocouple amplifiers
AD8675
TOP VIEW (Not to Scale)
NULL V+ OUT
05564-002
7 6 5
NC
NC = NO CONNECT
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 V, offset drift of 0.2 V/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 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 (-40C to +125C). The AD8675 amplifier is available in the tiny 8-lead MSOP, and the popular 8-lead, narrow SOIC, RoHS compliant packages. MSOP packaged devices are only available in tape and reel format.
Rev. A
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 (c)2005-2007 Analog Devices, Inc. All rights reserved.
05564-001
6 OUT TOP VIEW (Not to Scale) V- 4 5 NC
AD8675 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
4/07--Rev. 0 to Rev. A Inserted Figure 7 and Figure 8; renumbered sequentially ................................................................. 6 10/05--Revision 0: Initial Version
Rev. A | Page 2 of 12
AD8675 SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
VS = 5.0 V, VCM = 0 V, VO = 0 V, TA = +25C, unless otherwise specified. Table 1.
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Open-Loop Gain Symbol VOS -40C TA +125C IB -40C TA +125C IOS -40C TA +125C CMRR AVO VCM = -3.5 V to +3.5 V -40C TA +125C RL = 2 k to ground, VO = -4.0 V to +4.0 V -40C TA +125C -40C TA +125C RL = 2 k to ground -40C TA +125C RL = 2 k to ground -40C TA +125C -2 -5.5 -1 -2.8 -3.5 105 105 1000 700 Conditions Min Typ 10 12 0.5 -2 0.1 0.1 130 130 2000 1250 0.2 4.90 4.85 -4.91 -4.91 40 20 140 140 2.3 2.7 2.5 10 0.1 2.8 0.3 Max 75 240 2 5.5 1 2.8 3.5 Unit V nA nA nA nA V dB dB V/mV V/mV V/C V V V V mA mA dB dB mA mA V/s MHz V p-p nV/Hz pA/Hz
Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Limit Output Current 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
VOS/T VOH VOL ISC IO PSRR ISY
0.6
4.86 4.82
-4.86 -4.82
VS = 5.0 V to 15.0 V -40C TA +125C VO = 0 V -40C TA +125C RL = 2 k
120 120
2.7 3.4
SR GBP en p-p en in
0.1 Hz to 10 Hz f = 1 kHz f = 10 Hz
Rev. A | Page 3 of 12
AD8675
VS = 15 V, VCM = 0 V, VO = 0 V, TA = +25C, unless otherwise specified. Table 2.
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Open-Loop Gain Symbol VOS -40C TA +125C IB -40C TA +125C IOS -40C TA +125C CMRR AVO VCM = -12.5 V to +12.5 V -40C TA +125C RL = 2 k to ground, VO = -14.0 V to +14.0 V -40C TA +125C -40C TA +125C SOIC RL: 2 k to ground MSOP RL: 2 k to ground SOIC -40C TA +125C MSOP -40C TA +125C RL = 2 k to ground -40C TA +125C -2 -4.5 -1 -2.8 -13.5 114 114 1500 700 Conditions Min Typ 10 12 0.5 1 0.1 0.1 130 130 4000 1700 0.2 14.8 14.78 14.75 14.66 -14.85 -14.78 40 20 140 140 2.5 2.9 2.5 10 0.1 2.8 0.3 Max 75 240 2 4.5 1 2.8 13.5 Units V nA nA nA nA V dB dB V/mV V/mV V/C V V V V V V mA mA dB dB mA mA V/s MHz V p-p nV/Hz pA/Hz
Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High
VOS/T VOH
0.6
14.75 14.67 14.69 14.3
Output Voltage Low Short-Circuit Limit Output Current 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
VOL ISC IO PSRR ISY
-14.75 -14.69
VS = 5.0 V to 15.0 V -40C TA +125C VO = 0 V -40C TA +125C RL =10 k
120 120
2.9 3.8
SR GBP en p-p en in
0.1 Hz to 10 Hz f = 1 kHz f = 10 Hz
Rev. A | Page 4 of 12
AD8675 ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Supply Voltage Input Voltage Differential Input Voltage Output Short-Circuit Duration to GND Storage Temperature Range RM-8, R-8 Packages Operating Temperature Range Junction Temperature Range RM-8, R-8 Packages Lead Temperature Range (Soldering, 10 sec) Rating 18 V V supply 0.7 V Indefinite -65C to +150C -40C to +125C -65C to +150C 300C
THERMAL RESISTANCE
Table 4. Thermal Resistance
Package Type 8-Lead MSOP (RM-8) 8-Lead SOIC_N (R-8) JA 210 158 JC 45 43 Unit C/W C/W
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.
Rev. A | Page 5 of 12
AD8675 TYPICAL PERFORMANCE CHARACTERISTICS
15 V and 5 V, TA = 25C, unless otherwise specified.
10 9
150 100
VOLTAGE NOISE DENSITY (nV/ Hz)
8
OFFSET VOLTAGE (V)
1 10 100 1k 10k 100k
05564-011
7 6 5 4 3 2 1 0
50 0 -50 -100 -150 -200
-40
25 TEMPERATURE (C)
125
FREQUENCY (Hz)
Figure 3. Voltage Noise Density vs. Frequency
50 45 40
100 120
Figure 6. Offset Voltage vs. Temperature
VS = 15V TA = 25C
NUMBER OF AMPLIFIERS
35 30 25 20 15 10 5
NUMBER OF AMPLIFIERS
80
60
40
20
0.05
0.15
0.25
0.35
0.45
0.55
-0.65
-0.55
-0.45
-0.35
-0.25
-0.15
-0.05
0.65 0.65
0
0
0
-5
5
10
15
20
25
30
35
40
45
-30
-25
-20
-15
-10
50
OFFSET VOLTAGE (V)
05564-016
IB (nA)
Figure 4. Input Offset Voltage Distribution
25
160 140
Figure 7. Input Bias Current, VS = 15 V
VS = 5V TA = 25C
20
NUMBER OF AMPLIFIERS
NUMBER OF AMPLIFIERS
120 100 80 60 40 20
15
10
5
0.05
0.15
0.25
0.35
0.45
-0.65
-0.55
-0.45
-0.35
-0.25
-0.15
-0.05
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 0.65 0.70
0.75 0.80 0.85 0.90 0.95 1.00
0.55
0
05564-014
0
05564-008
TCVOS (V/C)
IB (nA)
Figure 5. TCVOS
Rev. A | Page 6 of 12
Figure 8. Input Bias Current, VS = 5 V
05564-006
05564-005
AD8675
5 4 3 2 1 VS = 5V
GAIN (dB)
120 100 80 60 40 20 0 -20 -40 -60 -80 -100 1k 10k 100k 1M 10M
05564-018
180 GAIN RL = 2k CL = 35pF M = 55.2
120
PHASE
60
0 -1 -2 -3 -4 -20 0 20 40 60 80 100 120
05564-007
0
VS = 15V
-60
-120
-120 100
-180 100M
-5 -40
FREQUENCY (Hz)
TEMPERATURE (C)
Figure 9. Input Bias Current vs. Temperature
3.0
60 50
Figure 12. Gain and Phase vs. Frequency
2.5
CLOSED-LOOP GAIN (dB)
40 G = 100 30 20 10 0 -10 -20 -30
05564-009
SUPPLY CURRENT (mA)
2.0
G = 10
1.5
1.0
G=1
0.5
5
10
15
20
25
30
35
10k
100k
1M
10M
100M
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
Figure 10. Supply Current vs. Total Supply Voltage
3.5 3.0 VS = 15V 2.5
ZOUT ()
70 60 50 40 30 20
Figure 13. Closed-Loop Gain vs. Frequency
ISY (mA)
2.0 1.5 1.0 0.5 0 -40
VS = 5V
AVO = 100
AVO = 10
AVO = 1 10 0 1k
-20
0
20
40
60
80
100
120
05564-019
10k
100k
1M
10M
100M
TEMPERATURE (C)
FREQUENCY (Hz)
Figure 11. Supply Current vs. Temperature
Figure 14. ZOUT vs. Frequency
Rev. A | Page 7 of 12
05564-015
05564-030
0
-40 1k
PHASE MARGIN (Degrees)
IB (nA)
AD8675
15
0.1 50 VIN 40 30 20 10 -0 VOUT -0.5 -0.6 -0.7 -4
05564-020
10
VIN = 11V RL = 2k AV = +1
0 -0.1
5
VOLTAGE (V)
-0.2 -0.3 -0.4
0
-5
-10 VIN = 200mV p-p AVO = -100 RL = 10k 1 6 11 16 TIME (s) 21 26 31 -20 -30 36
-10
OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V)
05564-029
05564-003 05564-004
-15 TIME (10s/DIV)
INPUT VOLTAGE (V)
Figure 15. Large Signal Transient Response, VSY = 15 V
4 3 2
0.3
Figure 18. Positive Overvoltage Recovery
50 VIN = 200mV p-p AVO = -100 40 RL = 10k 30 VIN 0 -0.1 -0.2 VOUT -0.3 -10 -20 -30 36 20 10 0
VIN = 3.5V RL = 2k AV = +1
0.2 0.1
INPUT VOLTAGE (V)
VOLTAGE (V)
1 0 -1 -2
-0.4
-3 -4 TIME (10s/DIV)
-0.5 -4
05564-028
1
6
11
16 TIME (s)
21
26
31
Figure 16. Large Signal Transient Response, VSY = 5 V
70 60 50 AV = +1 VIN = 100mV p-p 180 160 140 120
Figure 19. Negative Overvoltage Recovery
OVERSHOOT (%)
40 +OS 30 -OS 20 10 0
CMRR (dB)
05564-012
100 80 60 40 20 0
1
10
100
1k
10k
100k
-20 10
100
1k
10k
100k
1M
10M
100M
CAPACITANCE (pF)
FREQUENCY (Hz)
Figure 17. Small Signal Overshoot vs. Load Capacitance
Figure 20. CMRR vs. Frequency
Rev. A | Page 8 of 12
AD8675
160 140 120
1000 TA = 25C
SOURCE
VS - VOUT (mV)
100 -PSRR
100
PSRR (dB)
80 60 +PSRR 40 20 0 100 1k 10k 100k 1M 10M 100M
05564-022
10
SINK
0.01
0.1
1
10
100
FREQUENCY (Hz)
LOAD CURRENT (mA)
Figure 21. PSRR vs. Frequency
148 147 146 145 144 143 142 141 140 -40
14.86 14.84 14.82
Figure 24. Output Saturation Voltage vs. Output Current
VS = 15V RL = 2k
VOH
+SWING (V)
PSRR (dB)
14.80 14.78 14.76 14.74 14.72 14.70 -40
05564-023
-20
0
20
40
60
80
100
120
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
TEMPERATURE (C)
Figure 22. Power Supply Rejection Ratio vs. Temperature
0.06
-14.70
Figure 25. Swing vs. Temperature, VOH
VS = 15V RL = 2k
0.04
-14.75
0.02
-14.80
-SWING (V)
NOISE (V)
VOL -14.85
0
-0.02
-14.90
-0.04
-14.95
0
1
2
3
4
5 TIME (s)
6
7
8
9
10
05564-021
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
Figure 23. Voltage Noise (0.1 Hz to 10 Hz)
Figure 26. Swing vs. Temperature, VOL
Rev. A | Page 9 of 12
05564-033
-0.06
-15.00 -40
05564-032
05564-010
-20 10
1 0.001
AD8675
100k
1
V+
- INPUT +
2
8
AD8675
3 4
7 6
OUTPUT
V-
Figure 27. Optional Offset Nulling Circuit
Rev. A | Page 10 of 12
05564-031
VOS TRIM RANGE IS TYPICALLY 3.5mV
AD8675 OUTLINE DIMENSIONS
5.00 (0.1968) 4.80 (0.1890)
3.20 3.00 2.80
6.20 (0.2441) 5.80 (0.2284)
4.00 (0.1574) 3.80 (0.1497)
8 1
5 4
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) 0.25 (0.0099) 8 0 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157)
3.20 3.00 2.80
45
8
5
1
5.15 4.90 4.65
4
PIN 1 0.65 BSC 0.95 0.85 0.75 0.15 0.00
012407-A
0.51 (0.0201) 0.31 (0.0122)
1.10 MAX 8 0 0.80 0.60 0.40
COMPLIANT TO JEDEC STANDARDS MS-012-A A 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.
0.38 0.22 SEATING PLANE
0.23 0.08
COPLANARITY 0.10
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 -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
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]
Package Option RM-8 RM-8 R-8 R-8 R-8
Branding A08 A08
Z = RoHS Compliant Part.
Rev. A | Page 11 of 12
AD8675 NOTES
(c)2005-2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05564-0-4/07(A)
Rev. A | Page 12 of 12

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