16 V, 250 μA, Dual Precision, CMOS, Rail-to-Rail Output Operational Amplifier AD8667 Lower power at high voltage: 180 μA typical Low offset voltage: 100 μV Voltage noise 21 nV/√Hz at 10 kHz 23 nV/√Hz at 1 kHz Low input bias current: 300 fA Single-supply operation: 5 V to 16 V Dual-supply operation: ±2.5 V to ±8 V Output drive: 10 mA Unity gain stable PIN CONFIGURATION OUT A 1 –IN A 2 +IN A 3 V– 4 8 V+ AD8667 7 TOP VIEW (Not to Scale) OUT B 6 –IN B 5 +IN B 06276-001 FEATURES Figure 1. 8-Lead MSOP, 8-Lead SOIC APPLICATIONS Medical equipment Physiological measurement Precision references Buffer/level shifting Portable operated systems High density power budget systems Multipole filters Sensors Photodiode amplification ADC drivers GENERAL DESCRIPTION The AD8667 is a dual, rail-to-rail output, single-supply/dual-supply amplifier that uses Analog Devices, Inc. patented DigiTrim® trimming technique to achieve low offset voltage, 300 μV over the common-mode range. The AD8667 features an extended operating range with supply voltages up to 16 V for low power operation with an ISY of <325 μA per amplifier over temperature. The device is designed for low noise at higher voltages: 21 nV/√Hz at 10 kHz and 23 nV/√Hz at 1 kHz. It also features a low input bias current of 300 fA and a 10 mA output drive. The combination of low supply currents, low offsets, very low input bias currents, and wide supply range makes the AD8667 ideal for a wide variety of low power applications. Systems utilizing dc-to-low frequency measurements or high impedance sensors, such as photodiodes, benefit from the low input bias current, low noise, low offset, and low drive current. The wide operating voltage range matches today’s high performance ADCs and DACs. Medical monitoring equipment can take advantage of the low voltage noise, high input impedance, low voltage, and low current noise. The AD8667 is specified over the extended industrial temperature range of −40°C to +125°C. 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 ©2007 Analog Devices, Inc. All rights reserved. AD8667 TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................5 Applications....................................................................................... 1 Thermal Resistance .......................................................................5 Pin Configuration............................................................................. 1 ESD Caution...................................................................................5 General Description ......................................................................... 1 Typical Performance Characteristics ..............................................6 Revision History ............................................................................... 2 Outline Dimensions ....................................................................... 13 Specifications..................................................................................... 3 Ordering Guide .......................................................................... 13 Electrical Characteristics............................................................. 3 REVISION HISTORY 5/07—Revision 0: Initial Version Rev. 0 | Page 2 of 16 AD8667 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VS = 5.0 V, VCM = VS/2, TA = 25°C unless otherwise noted. Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol Test Conditions/Comments VOS VCM = 2.5 V −40°C < TA < +125°C VCM = 0 V to 3.5 V −40°C < TA < +85°C VCM = 0.2 V to 3.5 V, −40°C < TA < +125°C Min Typ 70 100 100 0.3 IB −40°C < TA < +85°C −40°C < TA < +125°C Input Offset Current IVR Common-Mode Rejection Ratio CMRR Large Signal Voltage Gain Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier AVO ΔVOS/ΔT VOH VOL ISC ZOUT PSRR ISY Current Noise Density 100 350 300 450 450 μV μV μV μV μV pA pA pA pA pA pA V V dB dB dB μV/°C 0.2 −40°C < TA < +85°C −40°C < TA < +125°C −40°C < TA < +85°C −40°C < TA < +125°C VCM = 0 V to 3.5 V VCM = 0.2 V to 3.5 V, −40°C < TA < +125°C RL = 2 kΩ, VO = 0.5 V to 4.5 V −40°C < TA < +125°C IL = 1 mA −40°C < TA < +125°C IL = 1 mA −40°C < TA < +125°C 0 0.2 80 80 106 4.65 4.6 f = 100 kHz, AV = 1 VS = 5 V to 16 V 95 15 50 3.5 3.5 90 90 115 1.3 4.8 4.7 150 200 ±6 120 105 180 −40°C < TA < +125°C DYNAMIC PERFORMANCE Slew Rate Settling Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Unit 20 150 IOS Input Voltage Range Max 5 200 250 275 325 V V mV mV mA Ω dB μA μA SR tS GBP ΦM RL = 2 kΩ To 0.1%, 0 V to 2 V step, AV = 10 0.2 12 600 60 V/μs μs kHz Degrees en p-p en f = 0.1 Hz to 10 Hz f = 10 kHz f = 1 kHz f = 1 kHz 3 21 23 0.05 μV p-p nV/√Hz nV/√Hz pA/√Hz in Rev. 0 | Page 3 of 16 AD8667 VS = 16 V, VCM = VS/2, TA = 25°C unless otherwise noted. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol Test Conditions/Comments VOS VCM = 8 V −40°C < TA < +125°C VCM = 0 V to 14.5 V −40°C < TA < +85°C VCM = 0.2 V to 14.5 V, −40°C < TA < +125°C Min Typ Max Unit 40 300 350 300 450 450 μV μV μV μV μV pA pA pA pA pA pA V V dB dB dB μV/°C 70 IB 0.3 −40°C < TA < +85°C −40°C < TA < +125°C Input Offset Current IOS Input Voltage Range IVR Common-Mode Rejection Ratio CMRR Large Signal Voltage Gain Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier 30 250 AVO ΔVOS/ΔT VOH VOL ISC ZOUT PSRR ISY 0.2 −40°C < TA < +85°C −40°C < TA < +125°C −40°C < TA < +85°C −40°C < TA < +125°C VCM = 0 V to 14.5 V VCM = 0.2 V to 14.5 V, −40°C < TA < +125°C RL = 2 kΩ, VO = 0.5 V to 15.5 V IL = 1 mA IL = 10 mA IL = 10 mA, −40°C < TA < +125°C IL = 1 mA IL = 10 mA IL = 10 mA, −40°C < TA < +125°C 0 0.2 90 90 112 15.8 14.8 14.65 f = 100 kHz, AV = 1 VS = 5 V to 16 V, −40°C < TA < +125°C 95 25 150 14.5 14.5 100 100 124 1.2 15.9 15.1 14.8 80 600 800 ±50 100 105 230 −40°C < TA < +125°C DYNAMIC PERFORMANCE Slew Rate Settling Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density 5 100 720 900 285 325 V V V mV mV mV mA Ω dB μA μA SR tS GBP ΦM RL = 2 kΩ To 0.1%, 0 V to 2 V step 0.3 12 600 60 V/μs μs kHz Degrees en p-p en f = 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz f = 1 kHz 3 23 21 0.05 μV p-p nV/√Hz nV/√Hz pA/√Hz in Rev. 0 | Page 4 of 16 AD8667 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 3. Parameter Supply Voltage Input Voltage Differential Input Voltage Output Short-Circuit Duration to GND Storage Temperature Range Lead Temperature (Soldering, 60 sec) Operating Temperature Range Junction Temperature Range Rating 18 V −0.1 V to VS 18 V Indefinite −60°C to +150°C 300°C −40°C to +125°C −65°C to +150°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. θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 4. Thermal Resistance Package Type 8-Lead MSOP 8-Lead SOIC ESD CAUTION Rev. 0 | Page 5 of 16 θJA 145 125 θJC 45 43 Unit °C/W °C/W AD8667 TYPICAL PERFORMANCE CHARACTERISTICS Specifications at VSY = ±8 V, unless otherwise noted. 1600 100 VS = ±8V 0V < VCM < 14.5V TA = 25°C 1200 INPUT BIAS CURRENT (pA) NUMBER OF AMPLIFIERS 1400 1000 800 600 400 ±8V 10 1 ±2.5V –200 –150 –100 –50 0 50 VOS (µV) 100 150 200 0.1 06276-003 0 –250 250 0 25 40 125 10000 30 25 20 15 10 5 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 TCVOS (µV/°C) SINK 10 1 0.01 0.1 LOAD CURRENT (mA) 1 10 10000 OUTPUT VOLTAGE TO SUPPLY RAIL (mV) VS = 16V 0V < VCM < 14.5V TA = 25°C 150 100 50 0 –50 –100 –150 –200 –250 1 2 3 4 5 6 7 8 9 VCM (V) 10 11 12 13 14 15 VS = 16V TA = 25°C 1000 100 SOURCE Figure 4. Input Offset Voltage vs. Common-Mode Voltage SINK 10 1 0.1 0.001 06276-005 –300 0 SOURCE Figure 6. Output Swing Saturation Voltage vs. Load Current 300 200 100 0.1 0.001 Figure 3. Input Offset Voltage Drift Distribution 250 1000 0.01 0.1 1 LOAD CURRENT (mA) 10 100 Figure 7. Output Swing Saturation Voltage vs. Load Current Rev. 0 | Page 6 of 16 06276-008 0 06276-004 0 VS = 5V TA = 25°C 06276-007 OUTPUT VOLTAGE TO SUPPLY RAIL (mV) VS = ±8V –40°C < TA < +125°C 35 NUMBER OF AMPLIFIERS 100 Figure 5. Input Bias Current vs. Temperature Figure 2. Input Offset Voltage Distribution VOS (µs) 50 75 TEMPERATURE (°C) 06276-006 200 AD8667 1200 1200 1000 1000 900 800 800 VOL @ 10mA V S = 16V ZOUT (Ω) 700 600 VDD – VOH @ 1mA VS = 16V 500 VDD – VOH @ 1mA VS = 5V 400 400 VOL @ 1mA VS = 5V 200 AV = 100 AV = 10 AV = 1 10k 100k FREQUENCY (Hz) 1M 200 100 0 –40 VOL @ 1mA VS = 16V –25 –10 5 20 35 50 65 TEMPERATURE (°C) 80 95 110 125 0 1k Figure 8. Output Saturation Voltage vs. Temperature 10M 06276-012 300 600 06276-009 OUTPUT SATURATION VOLTAGE (mV) VSY = ±8V VDD – VOH @ 10mA V S = 16V 1100 Figure 11. Closed-Loop Output Impedance vs. Frequency 120 150 VS = 16V TA = 125°C VS = ±8V 100 100 CMRR (dB) IB (pA) 50 0 80 60 –50 0 2 4 6 8 10 12 14 20 100 06276-010 –150 16 VCM (V) 1k Figure 9. Input Bias Current vs. Common Mode Voltage at 125°C 90 100 135 90 –45 PSRR (dB) 0 –10 PHASE (Degrees) 10 VS = ±8V 60 50 40 30 –50 PSRR+ 20 –90 –70 10 10k 100k FREQUENCY (Hz) 1M –135 10M Figure 10. Open-Loop Gain and Phase Shift vs. Frequency 0 100 1k 10k 100k FREQUENCY (Hz) Figure 13. PSRR vs. Frequency Rev. 0 | Page 7 of 16 1M 10M 06276-014 –90 1k PSRR+/PSRR– CHA 70 06276-011 GAIN (dB) 45 –30 PSRR– 80 PHASE GAIN 10M 90 50 30 1M Figure 12. CMRR vs. Frequency VSY = 16V 70 10k 100k FREQUENCY (Hz) 06276-013 40 –100 AD8667 60 VSY = ±8V AV = 1 CL = 200pF RL = 10kΩ VSY = ±8V RL = 10kΩ VOLTAGE (50mV/DIV) OVERSHOOT (%) 50 40 30 20 OS+ 10 100 CAPACITANCE (pF) 500 06276-018 0 10 06276-015 OS– TIME (2µs/DIV) Figure 17. Small Signal Transient Response Figure 14. Small Signal Overshoot vs. Load Capacitance 600 VSY = ±8V AV = 1 CL = 200pF RL = 2kΩ 500 VOLTAGE (2V/DIV) 16V ISY (µA) 400 5V 300 200 –10 5 20 35 50 65 TEMPERATURE (°C) 80 95 110 125 TIME (20µs/DIV) Figure 18. Large Signal Transient Response Figure 15. Supply Current vs. Temperature 27 0.15 2.0 VSY = ±8V VSY = ±8V AV = –100 0.10 INPUT VOLTAGE (50mV/DIV) 1.5 1.0 0.5 0 –0.5 –1.0 22 INPUT VOLTAGE 0.05 17 0 12 –0.05 7 –0.10 2 –3 –0.15 OUTPUT VOLTAGE –2.0 –8 –0.20 0 1 2 3 4 5 6 TIME (1s/DIV) 7 8 9 10 –0.25 TIME (20µs/DIV) Figure 19. Positive Overload Recovery Figure 16. 0.1 Hz to 10 Hz Input Voltage Noise Rev. 0 | Page 8 of 16 –13 06276-020 –1.5 06276-017 VOLTAGE (µV/DIV) 06276-019 –25 OUTPUT VOLTAGE (5V/DIV) 0 –40 06276-016 100 AD8667 0.05 35 0 30 10k 25 –0.10 20 –0.15 15 –0.20 10 5 –0.25 1k ZOUT (Ω) VSY = ±8V AV = –100 OUTPUT VOLTAGE (5V/DIV) INPUT VOLTAGE –0.05 AV = 100 AV = 10 AV = 1 100 10 OUTPUT VOLTAGE –5 TIME (20µs/DIV) 1 100 Figure 20. Negative Overload Recovery 1k 10k FREQUENCY (Hz) 1M Figure 23. Closed-Loop Output Impedance vs. Frequency 1000 0 VSY = ±8V 20kΩ VSY = ±8V CHANNEL SEPARATION (dB) –20 100 2kΩ –40 –60 –80 –100 –120 10 1 10 100 1000 FREQUENCY (Hz) –160 100 Figure 24. Channel Separation vs. Frequency 600 +125°C +85°C 500 +25°C 450 400 –40°C 350 300 250 200 150 100 0 0 2 4 6 8 VSY (V) 10 12 14 16 06276-023 VS = 0V TO ±8V, –40°C < TA < +125°C 50 10k FREQUENCY (Hz) Figure 21. Voltage Noise Density vs. Frequency 550 1k Figure 22. Supply Current vs. Supply Voltage Rev. 0 | Page 9 of 16 100k 06276-025 –140 06276-022 VOLTAGE NOISE DENSITY (nV/ Hz) 100k 06276-024 –0.35 06276-021 0 –0.30 ISY (µA) INPUT VOLTAGE (50mV/DIV) VSY = ±8V AD8667 Specifications at VSY =±2.5 V, unless otherwise noted. 120 1600 VSY = ±2.5V VS = +5V –0.1V < VCM < +3.5V TA = 25°C 80 90 60 40 1000 800 600 45 20 0 0 –20 –45 –40 400 –60 –90 –80 200 0 50 VOS (µV) 100 150 200 250 –120 1k Figure 25. Input Offset Voltage Distribution 40 100k FREQUENCY (Hz) –135 10M 1M Figure 28. Open-Loop Gain and Phase Shift vs. Frequency 60 VSY = ±2.5V –40°C < TA < 125°C 35 10k 06276-029 –50 06276-026 –100 0 –250 –200 –150 –100 VSY = ±2.5V AV = 100 40 30 CLOSED-LOOP GAIN (dB) NUMBER OF AMPLIFIERS PHASE (Degrees) 1200 GAIN (dB) NUMBER OF AMPLIFIERS 1400 135 VSY = ±2.5V 100 25 20 15 10 AV = 10 20 AV = 1 0 –20 0 1 2 3 TCVOS (µV) 4 5 –40 100 06276-027 0 10k 100k FREQUENCY (Hz) 1M 10M Figure 29. Closed-Loop Gain vs. Frequency Figure 26. Input Offset Voltage Drift Distribution 150 10k VSY = ±2.5V VSY = ±2.5V 0V < VCM < +3.5V TA = 25°C 100 1k 50 0 ZOUT (Ω) VOS (µs) 1k 06276-030 5 –50 –100 100 AV = 100 AV = 10 AV = 1 10 0 0.5 1.0 1.5 2.0 VCM (V) 2.5 3.0 3.5 1 100 06276-028 –200 1k 10k FREQUENCY (Hz) 100k Figure 30. Closed-Loop Output Impedance vs. Frequency Figure 27. Input Offset Voltage vs. Common-Mode Voltage Rev. 0 | Page 10 of 16 1M 06276-031 –150 AD8667 2.0 140 VSY = ±2.5V VSY = ±2.5V 1.5 120 1.0 VOLTAGE (µV/DIV) 80 60 40 0.5 0 –0.5 –1.0 20 –1.5 1k 10k 100k FREQUENCY (Hz) 1M 10M –2.0 06276-032 0 100 100 2 3 4 5 6 TIME (1s/DIV) 7 8 9 10 VSY = ±2.5V AV = 1 CL = 200pF RL = 10kΩ VSY = ±2.5V VOLTAGE (50mV/DIV) 80 70 PSRR (dB) 1 Figure 34. 0.1 Hz to 10 Hz Input Voltage Noise Figure 31. CMRR vs. Frequency 90 0 60 50 40 30 PSRR+ 20 0 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 06276-033 10 TIME (2µs/DIV) 06276-036 PSRR– Figure 35. Small Signal Transient Response Figure 32. PSRR vs. Frequency 80 VSY = ±2.5V RL = 10kΩ 70 VOLTAGE (20mV/DIV) 50 40 30 VSY = ±2.5V AV = 1 CL = 200pF RL = 2kΩ 20 OS– 0 10 OS+ 100 CAPACITANCE (pF) 500 TIME (10µs/DIV) Figure 36. Large Signal Transient Response Figure 33. Small Signal Overshoot vs. Load Capacitance Rev. 0 | Page 11 of 16 06276-037 10 06276-034 OVERSHOOT (%) 60 06276-035 CMRR (dB) 100 AD8667 1.5 1.0 –0.05 0.5 0 –0.5 –0.10 –1.0 –1.5 OUTPUT VOLTAGE –0.15 –2.0 –0.20 06276-038 –0.25 –2.5 –3.0 –3.5 TIME (20µs/DIV) 100 10 0 1 0 4.0 3.5 –0.15 –0.20 3.0 2.5 2.0 –0.25 1.5 1.0 OUTPUT VOLTAGE –0.30 –0.35 2kΩ –40 –60 –80 –100 –120 0.5 0 –0.5 TIME (20µs/DIV) CHANNEL SEPARATION (dB) –0.10 OUTPUT VOLTAGE (1V/DIV) VSY = ±2.5V AV = –100 –20 –1.0 –140 06276-039 INPUT VOLTAGE (50mV/DIV) INPUT VOLTAGE 6.0 5.5 5.0 4.5 VSY = ±2.5V 20kΩ 6.5 –0.05 1k Figure 39. Voltage Noise Density vs. Frequency 7.0 0 100 FREQUENCY (Hz) Figure 37. Positive Overload Recovery 0.05 10 –160 100 1k 10k FREQUENCY (Hz) Figure 40. Channel Separation vs. Frequency Figure 38. Negative Overload Recovery Rev. 0 | Page 12 of 16 100k 06276-041 0 06276-040 3.5 3.0 2.5 2.0 VOLTAGE NOISE DENSITY (nV/ Hz) INPUT VOLTAGE 0.05 VSY = ±2.5V 4.0 OUTPUT VOLTAGE (1V/DIV) VSY = ±2.5V AV = –100 0.10 INPUT VOLTAGE (50mV/DIV) 1000 4.5 0.15 AD8667 OUTLINE DIMENSIONS 3.20 3.00 2.80 8 3.20 3.00 2.80 5.15 4.90 4.65 5 1 4 PIN 1 0.65 BSC 0.95 0.85 0.75 1.10 MAX 0.15 0.00 0.38 0.22 COPLANARITY 0.10 0.80 0.60 0.40 8° 0° 0.23 0.08 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 41. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 5.00 (0.1968) 4.80 (0.1890) 1 5 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 6.20 (0.2441) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 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) 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. 012407-A 8 4.00 (0.1574) 3.80 (0.1497) Figure 42. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) ORDERING GUIDE Model AD8667ARMZ-R2 1 AD8667ARMZ-REEL1 AD8667ARZ1 AD8667ARZ-REEL1 AD8667ARZ-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 = RoHS Compliant Part. Rev. 0 | Page 13 of 16 Package Option RM-8 RM-8 R-8 R-8 R-8 Branding A1E A1E AD8667 NOTES Rev. 0 | Page 14 of 16 AD8667 NOTES Rev. 0 | Page 15 of 16 AD8667 NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06276-0-5/07(0) Rev. 0 | Page 16 of 16