PIN CONFIGURATIONS 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 NULL 1 –IN 2 +IN 3 V– 4 AD8675 8 NULL 7 V+ 6 OUT TOP VIEW (Not to Scale) 5 NC 05564-001 FEATURES NC = NO CONNECT Figure 1. 8-Lead SOIC_N (R-8) NULL 1 APPLICATIONS Precision instrumentation PLL filters Laser diode control loops Strain gage amplifiers Medical instrumentation Thermocouple amplifiers 8 NULL –IN 2 AD8675 7 V+ +IN 3 TOP VIEW (Not to Scale) 6 OUT 5 NC V– 4 NC = NO CONNECT 05564-002 Data Sheet 36 V Precision, 2.8 nV/√Hz Rail-to-Rail Output Op Amp AD8675 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. 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 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, railto-rail op amps, the AD8675 has very low input bias current and low input current noise. The AD8675 is specified for the extended industrial temperature range (−40°C to +125°C). 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. 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 The smaller packages and low power consumption afforded by the AD8675 allow maximum channel density or minimum board size for space-critical equipment. For the dual version of this ultraprecision, rail-to-rail op amp, see the AD8676 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 Single Dual Quad 0.9 nV AD797 1.1 nV AD8597 AD8599 1.8 nV ADA4004-1 ADA4004-2 ADA4004-4 2.8 nV AD8675 AD8676 3.8 nV AD8671 AD8672 AD8674 Rev. E 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 ©2005–2012 Analog Devices, Inc. All rights reserved. AD8675 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Thermal Resistance .......................................................................5 Applications ....................................................................................... 1 Power Sequencing .........................................................................5 Pin Configurations ........................................................................... 1 ESD Caution...................................................................................5 General Description ......................................................................... 1 Typical Performance Characteristics ..............................................6 Revision History ............................................................................... 2 Test Circuit ...................................................................................... 11 Specifications..................................................................................... 3 Outline Dimensions ....................................................................... 12 Electrical Specifications ............................................................... 3 Ordering Guide .......................................................................... 12 Absolute Maximum Ratings ............................................................ 5 REVISION HISTORY 7/12—Rev. D to Rev. E Added Power Sequencing Section .................................................. 5 Added Figure 28 and Figure 29; Renumbered Sequentially ..... 10 8/11—Rev. C to Rev. D Added Input Capacitance, Common Mode Parameter and Input Capacitance, Differential Mode Parameter, Table 3..................... 4 6/10—Rev. B to Rev. C Changes to Figure 10 ........................................................................ 7 5/10—Rev. A to Rev. B Changes to General Description Section ...................................... 1 Added Table 1; Renumbered Sequentially .................................... 1 Changes to Table 2 ............................................................................ 3 Changes to Table 3 ............................................................................ 4 Changes to Table 4 and Table 5 ....................................................... 5 Changes to Figure 4 and Figure 6 to Figure 8 ............................... 6 Changes to Figure 15 ........................................................................ 8 Changes to Figure 21 and Figure 24............................................... 9 Added Figure 27; Renumbered Sequentially .............................. 10 Updated Outline Dimensions ....................................................... 12 Changes to Ordering Guide .......................................................... 12 4/07—Rev. 0 to Rev. A Added Figure 7 and Figure 8; Renumbered Sequentially ........... 6 10/05—Revision 0: Initial Version Rev. E | Page 2 of 12 Data Sheet AD8675 SPECIFICATIONS ELECTRICAL SPECIFICATIONS VS = ±5.0 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Symbol Test Conditions/Comments VOS ΔVOS/ΔT IB −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C Input Offset Current IOS Input Voltage Range Common-Mode Rejection Ratio IVR CMRR Open-Loop Gain AVO −40°C ≤ TA ≤ +125°C OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Limit 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 Min VOH VOL VCM = −3.0 V to +3.0 V −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground, VO = −3.5 V to +3.5 V −40°C ≤ TA ≤ +125°C RL = 10 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 10 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C −2 −5.5 −1 −2.8 −3.0 105 105 120 ISY Max Unit 10 12 0.2 +0.5 −2 +0.1 +0.1 75 240 0.6 +2 +5.5 +1 +2.8 +3.0 µV µV µV/°C nA nA nA nA V dB dB dB 130 126 117 4.90 4.85 4.80 4.75 dB 4.95 4.90 −4.98 −4.91 ISC PSRR Typ −4.90 −4.85 −4.86 −4.82 ±35 VS = ±5.0 V to ±15.0 V −40°C ≤ TA ≤ +125°C VO = 0 V −40°C ≤ TA ≤ +125°C 120 120 140 2.3 2.7 3.4 V V V V V V V V mA dB dB mA mA 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. E | Page 3 of 12 AD8675 Data Sheet VS = ±15 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified. Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Symbol Test Conditions/Comments VOS ΔVOS/ΔT IB −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C Input Offset Current IOS Input Voltage Range Common-Mode Rejection Ratio IVR CMRR Open-Loop Gain AVO −40°C ≤ TA ≤ +125°C Input Capacitance, Common Mode Input Capacitance, Differential Mode OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Limit 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 Min VCM = −12.5 V to +12.5 V −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground, VO = −13.5 V to +13.5 V −40°C ≤ TA ≤ +125°C −2 −4.5 −1 −2.8 −12.5 114 114 123 VOL RL = 10 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 10 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C 14.85 14.80 14.60 14.40 ISY Unit 10 12 0.2 +0.5 +1 +0.1 +0.1 75 240 0.6 +2 +4.5 +1 +2.8 +12.5 132 µV µV µV/°C nA nA nA nA V dB dB dB 3.8 9.6 dB pF pF 130 14.92 14.80 −14.96 −14.85 ISC PSRR Max 117 CINCM CINDM VOH Typ −14.94 −14.90 −14.75 −14.69 ±35 VS = ±5.0 V to ±15.0 V −40°C ≤ TA ≤ +125°C VO = 0 V −40°C ≤ TA ≤ +125°C 120 120 140 2.5 2.9 3.8 V V V V V V V V 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 µV p-p nV/√Hz pA/√Hz Rev. E | Page 4 of 12 Data Sheet AD8675 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 4. Parameter Supply Voltage Input Voltage Input Current 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) NULL Pins (Pin 1, Pin 8), Input Current Maximum θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages and measured using a standard 4-layer board, unless otherwise specified. Rating ±18 V ±V supply ±5 mA ±0.7 V Indefinite Table 5. Thermal Resistance −65°C to +150°C −40°C to +125°C −65°C to +150°C 300°C <50 µA, VS < V+ 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. Package Type 8-Lead MSOP (RM-8) 8-Lead SOIC_N (R-8) θJA 142 120 θJC 45 45 Unit °C/W °C/W POWER SEQUENCING Establish the op amp supplies 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 Rev. E | Page 5 of 12 AD8675 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS ±15 V and ±5 V, TA = 25°C, unless otherwise specified. 10 150 VS = ±15V VOLTAGE NOISE DENSITY (nV/ Hz) 9 100 8 7 50 VOS (µV) 6 5 4 TYPICAL 0 –50 3 –100 2 1 10 100 1k 10k 100k FREQUENCY (Hz) 05564-011 –150 –40 0 0 20 40 60 80 100 120 TEMPERATURE (°C) Figure 6. Offset Voltage vs. Temperature Figure 3. Voltage Noise Density vs. Frequency 90 350 80 300 70 NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS –20 05564-005 1 60 50 40 30 250 200 150 100 20 –40 –20 0 20 40 60 80 100 VOS (µV) 0 –2.0 –1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2 1.6 2.0 05564-006 –60 05564-016 0 –100 –80 2.0 05564-008 50 10 IB (nA) Figure 7. Input Bias Current, VS = ±15 V Figure 4. Input Offset Voltage Distribution 25 350 300 NUMBER OF AMPLIFIERS 15 10 5 250 200 150 100 50 0 –2.0 –1.6 –1.2 –0.8 –0.4 05564-014 TCVOS (µV/°C) 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 0 0.4 0.8 1.2 IB (nA) Figure 8. Input Bias Current, VS = ±5 V Figure 5. TCVOS Rev. E | Page 6 of 12 1.6 Data Sheet AD8675 120 100 4 180 RL = 2kΩ CL = 35pF θM = 55.2 GAIN 80 3 2 40 0 60 0 0 –20 VS = ±15V –1 PHASE 20 GAIN (dB) VS = ±5V 1 IB (nA) 120 60 –60 –40 –60 –2 –120 –80 –3 PHASE MARGIN (Degrees) 5 –120 100 –20 0 20 40 60 80 100 10k 120 TEMPERATURE (°C) 100k 1M 10M –180 100M FREQUENCY (Hz) 05564-007 –5 –40 1k Figure 9. Input Bias Current vs. Temperature 05564-018 –100 –4 Figure 12. Gain and Phase vs. Frequency 60 2.4 50 40 CLOSED-LOOP GAIN (dB) 1.6 1.2 0.8 TA = 25°C RL = ∞ 4 6 G = 10 10 0 G=1 –10 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 SUPPLY VOLTAGE (V) –30 –40 1k 10k 100k 1M 10M 100M 05564-030 2 20 –20 0 0 G = 100 30 100M 05564-015 0.4 05564-009 SUPPLY CURRENT (mA) 2.0 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 AVO = 1 0 –40 –20 0 20 40 60 80 TEMPERATURE (°C) 100 120 05564-019 ISY (mA) 2.5 0 1k 10k 100k 1M FREQUENCY (Hz) Figure 14. ZOUT vs. Frequency Figure 11. Supply Current vs. Temperature Rev. E | Page 7 of 12 10M AD8675 Data Sheet 0.1 VIN = ±10V RL = 2kΩ AV = +1 0 –5 40 –0.1 30 –0.2 20 –0.3 10 0 –0.4 VOUT –0.5 –10 –10 VIN = 200mV p-p AVO = –100 RL = 10kΩ –0.6 –0.7 –4 05564-020 –15 TIME (10µs/DIV) 1 11 16 21 26 31 –30 36 Figure 18. Positive Overvoltage Recovery 4 50 VIN = 200mV p-p AVO = –100 40 RL = 10kΩ 0.3 VIN = ±3.5V RL = 2kΩ AV = +1 0.2 30 0.1 INPUT VOLTAGE (V) 2 VOLTAGE (V) 6 –20 TIME (µs) Figure 15. Large-Signal Transient Response, VSY = ±15 V 3 OUTPUT VOLTAGE (V) VOLTAGE (V) 5 0 05564-004 INPUT VOLTAGE (V) 10 50 VIN 1 0 –1 VIN 0 20 –0.1 10 0 –0.2 VOUT –0.3 –10 –0.4 –20 OUTPUT VOLTAGE (V) 15 –2 –0.5 –4 1 6 11 05564-028 –4 TIME (10µs/DIV) 16 21 26 –30 36 31 TIME (µs) Figure 16. Large-Signal Transient Response, VSY = ±5 V 05564-003 –3 Figure 19. Negative Overvoltage Recovery 180 70 AV = +1 VIN = 100mV p-p 160 60 140 CMRR (dB) 120 40 +OS 30 100 80 60 –OS 40 20 20 10 0 1 10 100 1k 10k CAPACITANCE (pF) 100k Figure 17. Small-Signal Overshoot vs. Load Capacitance –20 10 100 1k 10k 100k 1M FREQUENCY (Hz) Figure 20. CMRR vs. Frequency Rev. E | Page 8 of 12 10M 100M 05564-029 0 05564-012 OVERSHOOT (%) 50 Data Sheet AD8675 10k 140 SINK SOURCE PSRR+ PSRR– 120 1k VS – VOUT (mV) PSRR (dB) 100 80 60 100 40 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 100M 1 0.001 05564-022 0 10 0.01 0.1 1 LOAD CURRENT (mA) 10 100 05564-010 20 Figure 24. Output Saturation Voltage vs. Output Current Figure 21. Power Supply Rejection Ratio vs. Frequency 148 14.86 147 14.84 146 14.82 145 14.80 VS = ±15V RL = 2kΩ 14.78 143 14.76 142 14.74 141 14.72 140 –40 –20 0 20 40 60 80 100 120 14.70 –40 TEMPERATURE (°C) –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 05564-032 +SWING (V) 144 05564-023 PSRR (dB) VOH Figure 25. Swing vs. Temperature, VOH Figure 22. Power Supply Rejection Ratio vs. Temperature –14.70 0.06 –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 TIME (s) 8 9 10 –15.00 –40 Figure 23. Voltage Noise (0.1 Hz to 10 Hz) –20 0 20 40 60 80 TEMPERATURE (°C) Figure 26. Swing vs. Temperature, VOL Rev. E | Page 9 of 12 100 120 05564-033 –SWING (V) 0.04 05564-021 NOISE (µV) VS = ±15V RL = 2kΩ AD8675 Data Sheet 0.01 12 VSY = ±15V AV = 1 10 0.001 OUTPUT STEP (V) VS = 5V 0.0001 1k FREQUENCY (Hz) 10k 100k 05564-024 100 Figure 27. Distortion vs. Frequency VIN 6 4 2 VS = 15V 0.00001 10 8 0 0 2 6 4 SETTLING TIME TO 0.01% (µs) Figure 29. Output Step vs. Settling Time to 0.01% VSY = ±15V AV = 1 05564-128 VOUT Figure 28. No Phase Reversal Rev. E | Page 10 of 12 8 05564-129 DISTORTION (%) RL = 2kΩ VIN = 1V rms AV = +1 BW = 80kHz Data Sheet AD8675 TEST CIRCUIT 100kΩ V+ 1 2 7 AD8675 INPUT + 8 3 4 6 OUTPUT VOS TRIM RANGE IS TYPICALLY ±3.5mV V– Figure 30. Optional Offset Nulling Circuit Rev. E | Page 11 of 12 05564-031 – AD8675 Data Sheet OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 8 4.00 (0.1574) 3.80 (0.1497) 5 1 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) COPLANARITY 0.10 SEATING PLANE 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 012407-A 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. Figure 31. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 3.20 3.00 2.80 8 3.20 3.00 2.80 1 5.15 4.90 4.65 5 4 PIN 1 IDENTIFIER 0.65 BSC 0.95 0.85 0.75 15° MAX 1.10 MAX 0.40 0.25 6° 0° 0.23 0.09 0.80 0.55 0.40 COMPLIANT TO JEDEC STANDARDS MO-187-AA 10-07-2009-B 0.15 0.05 COPLANARITY 0.10 Figure 32. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters ORDERING GUIDE Model 1 AD8675ARMZ AD8675ARMZ-REEL AD8675ARZ AD8675ARZ-REEL AD8675ARZ-REEL7 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 = RoHS Compliant Part. ©2005–2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05564-0-7/12(E) Rev. E | Page 12 of 12 Package Option RM-8 RM-8 R-8 R-8 R-8 Branding A08 A08