Ultra Precision, 36 V, 2.8 nV/√Hz Dual Rail-to-Rail Output Op Amp AD8676 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 AD8676 8 V+ 7 OUT B 6 –IN B TOP VIEW (Not to Scale) 5 +IN B 06487-001 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 Figure 1. 8-Lead SOIC_N (R-8) OUT A 1 8 V+ –IN A 2 AD8676 7 OUT B +IN A 3 6 –IN B V– 4 TOP VIEW (Not to Scale) 5 +IN B 06487-002 FEATURES 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-torail 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, 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 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 μV 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 maximize 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. 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 ©2006 Analog Devices, Inc. All rights reserved. AD8676 TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................5 Applications....................................................................................... 1 Thermal Resistance .......................................................................5 Pin Configurations ........................................................................... 1 Power Sequencing .........................................................................5 General Description ......................................................................... 1 ESD Caution...................................................................................5 Revision History ............................................................................... 2 Typical Performance Characteristics ..............................................6 Specifications..................................................................................... 3 Outline Dimensions ....................................................................... 10 Electrical Specifications............................................................... 3 Ordering Guide .......................................................................... 10 REVISION HISTORY 10/06—Revision 0: Initial Version Rev. 0 | Page 2 of 12 AD8676 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 B Grade (SOIC) B Grade (MSOP) A Grade (SOIC, MSOP) Offset Voltage B Grade (SOIC, MSOP) A Grade (SOIC, MSOP) Input Bias Current Symbol Conditions VOS IOS −40°C ≤ TA ≤ +125°C CMRR Open-Loop Gain AVO ΔVOS/ΔT 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 −40°C ≤ TA ≤ +125°C VOH 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 Output Current ISC IO 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 Max Unit 12 50 60 100 μV μV μV 15 160 250 +2 +5.5 +1 +2.8 +3.5 μV μV nA nA nA nA V dB dB V/mV −40°C ≤ TA ≤ +125°C IB Input Voltage Range Common-Mode Rejection Ratio Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High Typ VOS −40°C ≤ TA ≤ +125°C Input Offset Current Min PSRR ISY VS = ±5.0 V to ±15.0 V −40°C ≤ TA ≤ +125°C VO = 0 V −40°C ≤ TA ≤ +125°C −2 −5.5 −1 −2.8 −3.5 105 105 1000 +0.5 +1 +0.1 +0.1 700 1250 0.2 +4.84 +4.78 130 130 2000 +4.86 +4.82 −4.95 −4.93 106 106 0.6 V/mV μV/°C V V −4.86 −4.82 V V +40 ±20 mA mA 120 120 2.3 2.7 dB dB mA mA 2.7 3.4 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 AD8676 VS = ±15 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage B Grade (SOIC) B Grade (MSOP) A Grade (SOIC, MSOP) Offset Voltage B Grade (SOIC, MSOP) A Grade (SOIC, MSOP) Input Bias Current Symbol Conditions VOS IOS −40°C ≤ TA ≤ +125°C CMRR Open-Loop Gain AVO ΔVOS/ΔT VOH Output Voltage Low VOL Short-Circuit Limit Output Current ISC IO 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 Max Unit 12 50 60 100 μV μV μV 15 160 250 +2 +4.5 +1 +2.8 +13.5 μV μV nA nA nA nA V dB dB V/mV −40°C ≤ TA ≤ +125°C IB Input Voltage Range Common-Mode Rejection Ratio Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High Typ VOS −40°C ≤ TA ≤ +125°C Input Offset Current Min PSRR ISY 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 −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C VS = ±5.0 V to ±15.0 V −40°C ≤ TA ≤ +125°C VO = 0 V −40°C ≤ TA ≤ +125°C −2 −4.5 −1 −2.8 −13.5 111 107 1500 −0.5 −1 −0.1 −0.1 700 1700 0.2 +14.65 +14.49 106 106 130 130 4000 +14.7 +14.59 −14.88 −14.83 0.6 V/mV μV/°C −14.75 −14.69 V V V V +40 ±20 mA mA 120 120 2.5 2.9 dB dB mA mA 2.9 3.8 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. 0 | Page 4 of 12 AD8676 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE 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 − 1.5 V ±0.7 V Indefinite Table 4. Thermal Resistance −65°C to +150°C −40°C to +125°C POWER SEQUENCING −65°C to +150°C 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. Package Type 8-Lead MSOP (RM) 8-Lead SOIC_N (R) θJA 210 158 θJC 45 43 Unit °C/W °C/W 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 Rev. 0 | Page 5 of 12 AD8676 TYPICAL PERFORMANCE CHARACTERISTICS ±15 V and ±5 V, TA = 25°C, unless otherwise specified. 10 150 100 8 7 50 6 VOS (µV) VOLTAGE NOISE DENSITY (nV/ Hz) 9 5 4 0 –50 3 2 –100 1 10 100 1k 10k 100k FREQUENCY (Hz) –150 –45 –30 –15 0 15 30 45 60 75 90 105 120 135 TEMPERATURE (°C) Figure 3. Voltage Noise Density vs. Frequency 06487-006 0 06487-003 1 Figure 6. Offset Voltage vs. Temperature 90 120 TA = 25°C 80 NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS 100 70 60 50 40 30 20 80 60 40 20 –60 –40 –20 0 20 40 60 80 100 VOS (µV) 0 06487-004 0 –100 –80 –0.65 –0.55 –0.45 –0.35 –0.25 –0.15 –0.05 0.05 IB (nA) Figure 4. Input Offset Voltage Distribution 06487-007 10 Figure 7. Input Bias Current, VSY = ±15 V 25 160 140 NUMBER OF AMPLIFIERS 15 10 5 120 100 80 60 40 0 06487-005 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 –0.65 –0.60 –0.55 –0.50 –0.45 –0.40 –0.35 –0.30 –0.25 –0.20 –0.15 IB (nA) Figure 8. Input Bias Current, VSY = ±5 V Figure 5. TCVOS Distribution Rev. 0 | Page 6 of 12 06487-008 20 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 NUMBER OF AMPLIFIERS 20 AD8676 120 4 100 180 RL = 2kΩ CL = 35pF θM = 55.2 GAIN 80 3 120 60 2 0 VSY = ±15V –1 60 20 GAIN (dB) VSY = ±5V 1 0 0 –20 –60 –40 –2 –60 –3 –120 –80 –4 –100 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) –120 100 06487-009 –5 –40 1k 10k 100k 1M 10M –180 100M 06487-012 IB (nA) PHASE 40 PHASE MARGIN (Degrees) 5 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) SUPPLY CURRENT (mA) 2.5 2.0 1.5 1.0 G = 100 30 20 G = 10 10 0 G=1 –10 –20 0.5 15 20 25 30 35 SUPPLY VOLTAGE (V) –40 1k 10k 100k 1M 10M 100M 06487-013 10 06487-010 5 100M 06487-014 –30 0 FREQUENCY (Hz) Figure 10. Supply Current vs. Total Supply Voltage Figure 13. Closed-Loop Gain vs. Frequency 3.5 70 60 3.0 50 2.5 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 80 100 TEMPERATURE (°C) 120 0 1k 06487-011 SUPPLY CURRENT (mA) VS = ±15V 10k 100k 1M FREQUENCY (Hz) Figure 11. Supply Current vs. Temperature Figure 14. ZOUT vs. Frequency Rev. 0 | Page 7 of 12 10M AD8676 0.1 0 –5 –0.1 30 –0.2 20 –0.3 10 0 –0.4 VOUT –0.5 –10 –10 –0.6 –0.7 –4 06487-015 –15 TIME (10µs/DIV) 1 21 0.3 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 –2 –0.3 –10 –3 –0.4 –20 –4 –0.5 –4 06487-016 VOLTAGE (V) 16 Figure 18. Positive Overvoltage Recovery VIN = ±3.5V RL = 2kΩ AV = +1 3 11 TIME (µs) Figure 15. Large Signal Transient Response, VSY = ±15 V 4 6 VIN = 200mV p-p –20 AVO = –100 RL = 10kΩ –30 26 31 36 TIME (10µs/DIV) 1 6 11 16 21 26 31 OUTPUT VOLTAGE (V) VOLTAGE (V) 5 40 OUTPUT VOLTAGE (V) 0 INPUT VOLTAGE (V) 10 50 VIN 06487-018 VIN = ±10V RL = 2kΩ AV = +1 –30 36 06487-019 15 TIME (µs) Figure 16. Large Signal Transient Response, VSY = ±5 V Figure 19. Negative Overvoltage Recovery 70 180 AV = +1 VIN = 100mV p-p 60 160 140 CMRR (dB) 120 40 +OS 30 100 80 60 –OS 40 20 20 10 1 10 100 1k 10k 100k CAPACITANCE (pF) Figure 17. Small Signal Overshoot vs. Load Capacitance –20 10 100 1k 10k 100k 1M FREQUENCY (Hz) Figure 20. CMRR vs. Frequency Rev. 0 | Page 8 of 12 10M 100M 06487-020 0 0 06487-017 OVERSHOOT (%) 50 AD8676 160 1000 POWER SUPPLY REJECTION RATIO (dB) TA = 25°C 140 120 SOURCE 100 VS – VOUT (mV) –PSRR 80 60 +PSRR 40 100 10 SINK 20 100 1k 10k 100k 1M 10M 1 0.001 06487-021 –20 10 100M FREQUENCY (Hz) 0.1 1 10 100 LOAD CURRENT (mA) Figure 21. Power Supply Rejection Ratio vs. Frequency Figure 24. Output Saturation Voltage vs. Output Load Current 148 14.86 147 14.84 146 14.82 145 14.80 VSY = ±15V RL = 2kΩ 144 143 14.78 14.76 142 14.74 141 14.72 140 –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 14.70 –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) Figure 22. Power Supply Rejection Ratio vs. Temperature 06487-025 +SWING (V) VOH 06487-022 POWER SUPPLY REJECTION RATIO (dB) 0.01 06487-024 0 Figure 25. +Swing vs. Temperature, VOH –14.70 0.06 0.04 –14.75 0.02 –14.80 0 VOL –14.85 –14.90 –0.04 –14.95 –0.06 0 1 2 3 4 5 6 7 8 TIME (s) 9 10 06487-023 –0.02 Figure 23. Voltage Noise (0.1 Hz to 10 Hz) –15.00 –40 –20 0 20 40 60 80 TEMPERATURE (°C) Figure 26. −Swing vs. Temperature, VOL Rev. 0 | Page 9 of 12 100 120 06487-026 –SWING (V) NOISE (µV) VSY = ±15V RL = 2kΩ AD8676 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 8 1 5 6.20 (0.2440) 5.80 (0.2284) 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) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 1 5.15 4.90 4.65 5 4 45° PIN 1 8° 0° 0.25 (0.0098) 0.17 (0.0067) 8 3.20 3.00 2.80 0.65 BSC 0.95 0.85 0.75 1.27 (0.0500) 0.40 (0.0157) 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. 1.10 MAX 0.15 0.00 060506-A 4.00 (0.1574) 3.80 (0.1497) 3.20 3.00 2.80 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 27. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) Figure 28. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters ORDERING GUIDE Model AD8676ARMZ-R2 1 AD8676ARMZ-REEL1 AD8676ARZ1 AD8676ARZ-REEL1 AD8676ARZ-REEL71 AD8676BRMZ-R21 AD8676BRMZ-REEL1 AD8676BRZ1 AD8676BRZ-REEL1 AD8676BRZ-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 −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] 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 10 of 12 Package Option RM-8 RM-8 R-8 R-8 R-8 RM-8 RM-8 R-8 R-8 R-8 Branding A13 A13 A1L A1L AD8676 NOTES Rev. 0 | Page 11 of 12 AD8676 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05564-0-10/06(0) Rev. 0 | Page 12 of 12