AD8676

Ultra Precision, 36 V, 2.8 nV/√Hz Dual Rail-to-Rail Output Op Amp AD8676 FEATURES 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 PIN CONFIGURATIONS OUT A –IN A +IN A V– 1 2 3 4 8 V+ OUT B 06487-001 AD8676 7 6 –IN B TOP VIEW (Not to Scale) 5 +IN B Figure 1. 8-Lead SOIC_N (R-8) OUT A –IN A +IN A V– 1 2 3 4 8 V+ OUT B +IN B 06487-002 AD8676 TOP VIEW (Not to Scale) 7 6 5 APPLICATIONS Precision instrumentation PLL filters Laser diode control loops Strain gage amplifiers Medical instrumentation Thermocouple amplifiers –IN B 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 Applications....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Specifications............................................................... 3 Absolute Maximum Ratings ............................................................5 Thermal Resistance .......................................................................5 Power Sequencing .........................................................................5 ESD Caution...................................................................................5 Typical Performance Characteristics ..............................................6 Outline Dimensions ....................................................................... 10 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 Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Open-Loop Gain Symbol VOS 12 50 60 100 160 250 +2 +5.5 +1 +2.8 +3.5 μV μV μV μV μV nA nA nA nA V dB dB V/mV V/mV μV/°C V V −4.86 −4.82 V V mA mA Conditions Min Typ Max Unit VOS −40°C ≤ TA ≤ +125°C 15 IB −40°C ≤ TA ≤ +125°C IOS −40°C ≤ TA ≤ +125°C CMRR AVO 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 RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C −2 −5.5 −1 −2.8 −3.5 105 105 1000 700 +0.5 +1 +0.1 +0.1 130 130 2000 1250 0.2 +4.86 +4.82 −4.95 −4.93 +40 ±20 Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High ΔVOS/ΔT VOH 0.6 +4.84 +4.78 Output Voltage Low VOL 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 ISC IO PSRR ISY VS = ±5.0 V to ±15.0 V −40°C ≤ TA ≤ +125°C VO = 0 V −40°C ≤ TA ≤ +125°C RL = 2 kΩ 106 106 120 120 2.3 2.7 2.5 10 0.1 2.8 0.3 2.7 3.4 dB dB mA mA V/μs MHz μV p-p nV/√Hz pA/√Hz SR GBP en p-p en in 0.1 Hz to 10 Hz f = 1 kHz f = 10 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 Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Open-Loop Gain Symbol VOS 12 50 60 100 160 250 +2 +4.5 +1 +2.8 +13.5 μV μV μV μV μV nA nA nA nA V dB dB V/mV V/mV μV/°C V V V V mA mA Conditions Min Typ Max Unit VOS −40°C ≤ TA ≤ +125°C 15 IB −40°C ≤ TA ≤ +125°C IOS −40°C ≤ TA ≤ +125°C CMRR AVO 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 −2 −4.5 −1 −2.8 −13.5 111 107 1500 700 −0.5 −1 −0.1 −0.1 130 130 4000 1700 0.2 +14.7 +14.59 −14.88 −14.83 +40 ±20 Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low ΔVOS/ΔT VOH VOL 0.6 +14.65 +14.49 −14.75 −14.69 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 ISC IO PSRR ISY VS = ±5.0 V to ±15.0 V −40°C ≤ TA ≤ +125°C VO = 0 V −40°C ≤ TA ≤ +125°C RL =10 kΩ 106 106 120 120 2.5 2.9 2.5 10 0.1 2.8 0.3 2.9 3.8 dB dB mA mA V/μs MHz μV p-p nV/√Hz pA/√Hz SR GBP en p-p en in 0.1 Hz to 10 Hz f = 1 kHz f = 10 Hz Rev. 0 | Page 4 of 12 AD8676 ABSOLUTE MAXIMUM RATINGS 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 −65°C to +150°C −40°C to +125°C −65°C to +150°C 300°C THERMAL RESISTANCE Table 4. Thermal Resistance Package Type 8-Lead MSOP (RM) 8-Lead SOIC_N (R) θJA 210 158 θJC 45 43 Unit °C/W °C/W POWER SEQUENCING 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. 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. ESD CAUTION Rev. 0 | Page 5 of 12 AD8676 TYPICAL PERFORMANCE CHARACTERISTICS ±15 V and ±5 V, TA = 25°C, unless otherwise specified. 10 9 150 VOLTAGE NOISE DENSITY (nV/ Hz) 8 7 100 50 VOS (µV) 06487-003 6 5 4 3 2 1 1 10 100 1k 10k 100k 0 –50 –100 0 15 30 45 60 75 90 105 120 135 FREQUENCY (Hz) TEMPERATURE (°C) Figure 3. Voltage Noise Density vs. Frequency 90 80 70 60 50 40 30 20 10 0 –100 –80 0 06487-004 Figure 6. Offset Voltage vs. Temperature 120 TA = 25°C 100 NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS 80 60 40 20 VOS (µV) IB (nA) Figure 4. Input Offset Voltage Distribution 25 160 140 Figure 7. Input Bias Current, VSY = ±15 V 20 NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS 120 100 80 60 40 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 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 06487-005 0 TCVOS (µV/°C) IB (nA) Figure 5. TCVOS Distribution Figure 8. Input Bias Current, VSY = ±5 V Rev. 0 | Page 6 of 12 06487-008 –0.65 –0.60 –0.55 –0.50 –0.45 –0.40 –0.35 –0.30 –0.25 –0.20 –0.15 06487-007 –60 –40 –20 0 20 40 60 80 100 –0.65 –0.55 –0.45 –0.35 –0.25 –0.15 –0.05 0.05 06487-006 0 –150 –45 –30 –15 AD8676 5 4 3 2 120 100 80 60 40 PHASE 60 1 VSY = ±5V GAIN RL = 2kΩ CL = 35pF θM = 55.2 180 120 0 –1 –2 –3 –4 06487-009 GAIN (dB) IB (nA) 20 0 –20 –40 –60 –80 –100 –120 –60 0 VSY = ±15V –20 0 20 40 60 80 100 120 1k 10k 100k 1M 10M TEMPERATURE (°C) FREQUENCY (Hz) Figure 9. Input Bias Current vs. Temperature 3.0 60 50 2.5 40 Figure 12. Gain and Phase vs. Frequency CLOSED-LOOP GAIN (dB) SUPPLY CURRENT (mA) G = 100 30 20 10 0 –10 –20 –30 G=1 G = 10 2.0 1.5 1.0 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 70 60 50 VS = ±5V 40 30 20 Figure 13. Closed-Loop Gain vs. Frequency SUPPLY CURRENT (mA) 2.5 1.5 1.0 0.5 0 –40 ZOUT (Ω) 2.0 AVO = 100 AVO = 10 AVO = 1 10 0 1k –20 0 20 40 60 80 100 120 10k 100k 1M 10M 100M TEMPERATURE (°C) FREQUENCY (Hz) Figure 11. Supply Current vs. Temperature Figure 14. ZOUT vs. Frequency Rev. 0 | Page 7 of 12 06487-014 06487-011 06487-013 06487-010 0 –40 1k 06487-012 –5 –40 –120 100 –180 100M PHASE MARGIN (Degrees) AD8676 15 VIN = ±10V RL = 2kΩ AV = +1 0.1 0 –0.1 5 VIN 50 40 30 20 10 0 VOUT –0.5 –10 –0.6 –0.7 –4 –10 VIN = 200mV p-p –20 AVO = –100 RL = 10kΩ –30 26 31 36 10 VOLTAGE (V) –0.2 –0.3 –0.4 0 –5 06487-015 1 6 11 16 TIME (µs) 21 TIME (10µs/DIV) Figure 15. Large Signal Transient Response, VSY = ±15 V 4 3 2 0.3 0.2 0.1 Figure 18. Positive Overvoltage Recovery 50 VIN = 200mV p-p AVO = –100 40 RL = 10kΩ VIN 0 –0.1 –0.2 VOUT –0.3 –0.4 –0.5 –4 –10 –20 –30 36 20 10 0 VIN = ±3.5V RL = 2kΩ AV = +1 VOLTAGE (V) 1 0 –1 –2 –3 –4 TIME (10µs/DIV) 06487-016 1 6 11 16 TIME (µs) 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) 100 80 60 40 20 0 06487-017 1 10 100 1k 10k 100k 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. 0 | Page 8 of 12 06487-020 –20 10 06487-019 OUTPUT VOLTAGE (V) 30 INPUT VOLTAGE (V) 06487-018 –15 OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) AD8676 160 1000 TA = 25°C 140 120 POWER SUPPLY REJECTION RATIO (dB) SOURCE 80 60 +PSRR 40 20 0 06487-021 VS – VOUT (mV) 100 –PSRR 100 10 SINK 100 1k 10k 100k 1M 10M 100M 0.01 0.1 1 10 100 FREQUENCY (Hz) LOAD CURRENT (mA) Figure 21. Power Supply Rejection Ratio vs. Frequency Figure 24. Output Saturation Voltage vs. Output Load Current 148 14.86 14.84 14.82 VOH 14.80 14.78 14.76 14.74 14.72 14.70 –40 VSY = ±15V RL = 2kΩ POWER SUPPLY REJECTION RATIO (dB) 147 146 145 144 143 142 141 140 –40 06487-022 +SWING (V) –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 VSY = ±15V RL = 2kΩ 0.04 –14.75 0.02 –14.80 –SWING (V) NOISE (µV) VOL –14.85 0 –0.02 –14.90 –0.04 –14.95 06487-023 0 1 2 3 4 5 TIME (s) 6 7 8 9 10 –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. 0 | Page 9 of 12 06487-026 –0.06 –15.00 –40 06487-025 06487-024 –20 10 1 0.001 AD8676 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 3.20 3.00 2.80 6.20 (0.2440) 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 060506-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 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] 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 Z = Pb-free part. Rev. 0 | Page 10 of 12 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