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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 8 NULL V+ OUT NC 05564-002 AD8675 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 3 V- 4 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 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 (c) 2005 Analog Devices, Inc. All rights reserved. 05564-001 6 OUT TOP VIEW V- 4 (Not to Scale) 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 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 = +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 -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 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 Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High VOS/T VOH 0.6 4.86 4.82 Output Voltage Low VOL RL = 2 k to ground -40C TA +125C -4.91 -4.91 -4.86 -4.82 V V Short-Circuit Limit Output Current ISC IO 40 20 mA mA 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 -40C TA +125C VO = 0 V -40C TA +125C RL = 2 k 120 120 140 140 2.3 2.7 2.5 10 0.1 2.8 0.3 2.7 3.4 dB dB mA mA V/s MHz V 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 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 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 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 V V mA mA mA mA dB dB mA mA V/s MHz Vp-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 VOL -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 40 20 PSRR ISY VS = 5.0 V to 15.0 V -40C TA +125C VO = 0 V -40C TA +125C RL =10 k 120 120 140 140 2.5 2.9 2.5 10 0.1 2.8 0.3 2.9 3.8 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 AD8675 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 0.7 V Indefinite -65C to +150C -40C to +125C -65C to +150C +300C 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. THERMAL RESISTANCE Table 4. Thermal Resistance Package Type 8-Lead MSOP (RM) 8-Lead SOIC_N (R) JA 210 158 JC 45 43 Unit C/W C/W 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 AD8675 TYPICAL PERFORMANCE CHARACTERISTICS 15 V and 5 V, TA = 25C, unless otherwise specified. 10 9 150 VOLTAGE NOISE DENSITY (nV/ Hz) 100 8 OFFSET VOLTAGE (V) 7 6 5 4 3 2 1 0 1 10 100 1k 10k FREQUENCY (Hz) 50 0 -50 -100 -150 -200 -40 25 TEMPERATURE (C) 125 100k Figure 3. Voltage Noise Density vs. Frequency 50 45 40 100 120 Figure 6. Offset Voltage vs. Temperature NUMBER OF AMPLIFIERS 35 30 25 20 15 10 05564-016 NUMBER OF AMPLIFIERS 80 60 40 20 05564-008 5 0 0 0 5 OFFSET VOLTAGE (V) Figure 4. Input Offset Voltage Distribution 25 160 140 20 NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS 120 100 80 60 40 05564-027 15 10 5 05564-014 20 0 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 TCVOS (V/C) Figure 5. TcVos Rev. 0 | Page 6 of 12 -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 IB (nA) -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 IB (nA) -5 10 15 20 25 30 35 40 45 -30 -25 -20 -15 -10 50 Figure 7. Input Bias Current, VSY = 15 V Figure 8. Input Bias Current, VSY = 5 V 05564-005 05564-011 AD8675 5 4 3 2 120 100 80 60 40 PHASE 60 VSY = 5V GAIN RL = 2k CL = 35pF M = 55.2 180 120 0 -1 -2 -3 -4 -5 -40 -20 0 20 40 60 80 100 120 05564-007 GAIN (dB) 1 IB (nA) 20 0 -20 -40 -60 -80 -100 -120 100 1k 10k 100k 1M 10M -180 100M -120 -60 0 VSY = 15V PHASE MARGIN (Degrees) 05564-015 05564-030 05564-018 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 G = 10 10 0 G=1 -10 -20 2.0 1.5 1.0 0.5 05564-009 -30 -40 1k 10k 100k 1M 10M 0 5 10 15 20 25 30 35 SUPPLY VOLTAGE (V) 100M FREQUENCY (Hz) Figure 10. Supply Current vs. Total Supply Voltage 3.5 70 60 VS = 15V 2.5 50 VS = 5V Figure 13. Closed-Loop Gain vs. Frequency 3.0 1.5 ZOUT () ISY (mA) 2.0 40 AVO = 100 30 20 AVO = 10 1.0 0.5 0 -40 AVO = 1 05564-019 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 AD8675 15 VIN = 11V RL = 2k AV = +1 0.1 VIN 0 -0.1 5 40 30 20 10 -0 VOUT -0.5 -10 05564-020 50 10 VOLTAGE (V) -0.2 -0.3 -0.4 0 -5 -10 05564-004 -0.6 -0.7 -4 VIN = 200mV p-p -20 AVO = -100 RL = 10k 1 6 11 16 TIME (s) 21 26 31 -30 36 -15 TIME (10s/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 = 10k 30 VIN 0 -0.1 -0.2 VOUT -0.3 05564-028 VIN = 3.5V RL = 2k AV = +1 VOLTAGE (V) 1 0 -1 -2 -3 -4 TIME (10s/DIV) 20 10 0 -10 -0.5 -4 1 6 11 16 TIME (s) 21 26 31 -30 36 Figure 16. Large Signal Transient Response, VSY = 5 V 70 AV = +1 VIN = 100mV p-p 60 140 50 120 180 160 Figure 19. Negative Overvoltage Recovery OVERSHOOT (%) 40 +OS 30 -OS 20 CMRR (dB) 100 80 60 40 20 05564-012 0 -20 10 100 1k 10k 100k 1M 10M 0 1 10 100 1k 10k CAPACITANCE (pF) 100k 100M FREQUENCY (Hz) Figure 17. Small Signal Overshoot vs. Load Capacitance Figure 20. CMRR vs. Frequency Rev. 0 | Page 8 of 12 05564-029 10 05564-003 -0.4 -20 OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) AD8675 160 140 120 SOURCE 1000 TA = 25C 80 60 +PSRR 40 20 05564-022 VS - VOUT (mV) 100 -PSRR 100 PSRR (dB) 10 SINK 0 -20 10 100 1k 10k 100k 1M 10M 100M 1 0.001 0.01 0.1 1 10 100 FREQUENCY (Hz) LOAD CURRENT (mA) Figure 21. PSRR vs. Frequency Figure 24. Output Saturation Voltage vs. Output Current 148 147 146 145 144 143 142 05564-023 14.86 14.84 14.82 VOH 14.80 14.78 14.76 14.74 05564-032 VSY = 15V RL = 2k 141 140 -40 +SWING (V) PSRR (dB) 14.72 14.70 -40 -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 = 2k 0.04 -14.75 0.02 -14.80 0 -SWING (V) NOISE (V) VOL -14.85 -0.02 -14.90 -0.04 05564-021 -14.95 05564-033 -0.06 0 1 2 3 4 5 TIME (s) 6 7 8 9 10 -15.00 -40 -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 05564-010 AD8675 100k V+ 1 8 7 - INPUT + 2 AD8675 3 4 6 OUTPUT V- Figure 27. Optional Offset Nulling Circuit Rev. 0 | Page 10 of 12 05564-031 VOS TRIM RANGE IS TYPICALLY 3.5mV AD8675 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 8 5 3.20 3.00 2.80 4.00 (0.1574) 3.80 (0.1497) 1 6.20 (0.2440) 3.20 3.00 2.80 8 5 4 5.80 (0.2284) 1 5.15 4.90 4.65 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) 1.75 (0.0688) 1.35 (0.0532) 0.50 (0.0196) x 45 0.25 (0.0099) PIN 1 4 0.65 BSC 0.51 (0.0201) COPLANARITY SEATING 0.31 (0.0122) 0.10 PLANE 8 0.25 (0.0098) 0 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067) 0.95 0.85 0.75 0.15 0.00 0.38 0.22 1.10 MAX 8 0 0.80 0.60 0.40 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 0.23 0.08 SEATING PLANE 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 = Pb-free part. Rev. 0 | Page 11 of 12 AD8675 NOTES (c) 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 |
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