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