AD8691_8692_8694_低压低噪运放

Low Cost, Low Noise, CMOS, RRO Operational Amplifiers AD8691/AD8692/AD8694 Rev. E 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 ©2004–2011 Analog Devices, Inc. All rights reserved. FEATURES Offset voltage: 400 μV typical Low offset voltage drift: 6 μV/°C maximum (AD8692/AD8694) Very low input bias currents: 1 pA maximum Low noise: 8 nV/√Hz Low distortion: 0.0006% Wide bandwidth: 10 MHz Unity-gain stable Single-supply operation: 2.7 V to 6 V Qualified for automotive applications APPLICATIONS Photodiode amplification Battery-powered instrumentation Medical instruments Multipole filters Sensors Portable audio devices GENERAL DESCRIPTION The AD8691, AD8692, and AD8694 are low cost, single, dual, and quad rail-to-rail output, single-supply amplifiers featuring low offset and input voltages, low current noise, and wide signal bandwidth. The combination of low offset, low noise, very low input bias currents, and high speed make these amplifiers useful in a wide variety of applications. Filters, integrators, photodiode amplifiers, and high impedance sensors all benefit from this combination of performance features. Audio and other ac applications benefit from the wide bandwidth and low distortion of these devices. Applications for these amplifiers include power amplifier (PA) controls, laser diode control loops, portable and loop-powered instrumentation, audio amplification for portable devices, and ASIC input and output amplifiers. The small SC70 and TSOT package options for the AD8691 allow it to be placed next to sensors, thereby reducing external noise pickup. The AD8691, AD8692, and AD8694 are specified over the extended industrial temperature range of −40°C to +125°C. The AD8691 single is available in 5-lead SC70 and 5-lead TSOT packages. The AD8692 dual is available in 8-lead MSOP and narrow SOIC surface-mount packages. The AD8694 quad is available in 14-lead TSSOP and narrow 14-lead SOIC packages. See the Ordering Guide section for automotive grades. PIN CONFIGURATIONS OUT 1 +IN 3 V– 2 V+5 –IN4 AD8691 TOP VIEW (Not to Scale) 04 99 1- 03 0 Figure 1. 5-Lead TSOT OUT A 1 V– 2 +IN A 3 V+5 –IN4 AD8691 04 99 1- 03 1 Figure 2. 5-Lead SC70 OUT A 1 –IN A 2 +IN A 3 V– 4 V+8 OUT B7 –IN B6 +IN B5 AD8692 TOP VIEW (Not to Scale) 04 99 1- 00 1 Figure 3. 8-Lead MSOP OUT A 1 –IN A 2 +IN A 3 V– 4 V+8 OUT B7 –IN B6 +IN B5 AD8692 TOP VIEW (Not to Scale) 04 99 1- 00 2 Figure 4. 8-Lead SOIC OUT A 1 –IN A 2 +IN A 3 V+ 4 OUT D14 –IN D13 +IN D12 V–11 +IN B 5 +IN C10 –IN B 6 –IN C9 OUT B 7 OUT C8 AD8694 TOP VIEW (Not to Scale) 04 99 1- 03 2 Figure 5. 14-Lead SOIC 04 99 1- 03 3 1 2 3 4 5 6 7 AD8694 –IN A +IN A V+ OUT B –IN B +IN B OUT A 14 13 12 11 10 9 8 –IN D +IN D V– OUT C –IN C +IN C OUT D TOP VIEW (Not to Scale) Figure 6. 14-Lead TSSOP AD8691/AD8692/AD8694 Rev. E | Page 2 of 16 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Pin Configurations ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics ............................................................. 3 Absolute Maximum Ratings ............................................................5 Thermal Characteristics ...............................................................5 ESD Caution...................................................................................5 Typical Performance Characteristics ..............................................6 Outline Dimensions ....................................................................... 11 Ordering Guide .......................................................................... 14 Automotive Products ................................................................. 14 REVISION HISTORY 8/11—Rev. D to Rev. E Changes to Figure 20........................................................................ 8 11/10—Rev. C to Rev. D Changes to Features Section and General Descriptions Section................................................................................................ 1 Updated Outline Dimensions ....................................................... 11 Changes to Ordering Guide .......................................................... 14 Added Automotive Products Section .......................................... 14 5/07—Rev. B to Rev. C Change to Figure 1 ........................................................................... 1 Changes to Large Signal Voltage Gain Values in Table 1 ............ 3 Change to Phase Margin Symbol in Table 1 ................................. 3 Change to TA Value for Table 2 ....................................................... 4 Changes to Large Signal Voltage Gain Values in Table 2 ............ 4 Change to Phase Margin Symbol in Table 2 ................................. 4 Changes to Table 4............................................................................ 5 Changes to Outline Dimensions................................................... 11 Changes to Ordering Guide .......................................................... 12 3/05—Rev. A to Rev. B Added AD8694 ...................................................................Universal 1/05—Rev. 0 to Rev. A Added AD8691 ...................................................................Universal Changes to Features ..........................................................................1 Added Figure 1 and Figure 2............................................................1 Changes to Electrical Characteristics .............................................3 Changes to Figure 6 caption.............................................................6 Changes to Figure 9...........................................................................6 Updated Outline Dimensions....................................................... 11 Changes to Ordering Guide .......................................................... 11 10/04—Revision 0: Initial Version AD8691/AD8692/AD8694 Rev. E | Page 3 of 16 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VS = 2.7 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 1. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS VCM = −0.3 V to +1.6 V 0.4 2.0 mV VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C 3.0 mV Input Bias Current IB 0.2 1 pA −40°C < TA < +85°C 50 pA −40°C < TA < +125°C 260 pA Input Offset Current IOS 0.1 0.5 pA −40°C < TA < +85°C 20 pA −40°C < TA < +125°C 75 pA Input Voltage Range −0.3 +1.6 V Common-Mode Rejection Ratio CMRR VCM = −0.3 V to +1.6 V 68 90 dB VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C 60 85 dB Large Signal Voltage Gain AVO AD8691/AD8692 RL = 2 kΩ, VO = 0.5 V to 2.2 V 90 250 V/mV AD8694 RL = 2 kΩ, VO = 0.5 V to 2.2 V 60 V/mV Offset Voltage Drift ∆VOS/∆T AD8691 2 12 μV/°C AD8692/AD8694 1.3 6 μV/°C INPUT CAPACITANCE Common-Mode Input Capacitance CCM 5 pF Differential Input Capacitance CDM 2.5 pF OUTPUT CHARACTERISTICS Output Voltage High VOH IL = 1 mA 2.64 2.66 V −40°C < TA < +125°C 2.6 V Output Voltage Low VOL IL = 1 mA 25 40 mV −40°C < TA < +125°C 60 mV Short-Circuit Current ISC ±20 mA Closed-Loop Output Impedance ZOUT f = 1 MHz, AV = 1 12 Ω POWER SUPPLY Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 80 95 dB −40°C < TA < +125°C 75 95 dB Supply Current/Amplifier ISY VO = 0 V 0.85 0.95 mA −40°C < TA < +125°C 1.2 mA DYNAMIC PERFORMANCE Slew Rate SR RL = 2 kΩ 5 V/μs Settling Time tS To 0.01% 1 μs Gain Bandwidth Product GBP 10 MHz Phase Margin Øm 60 Degrees Total Harmonic Distortion + Noise THD + N G = 1, RL = 600 Ω, f = 1 kHz, VO = 250 mV p-p 0.003 % NOISE PERFORMANCE Voltage Noise en p-p f = 0.1 Hz to 10 Hz 1.6 3.0 μV p-p Voltage Noise Density en f = 1 kHz 8 12 nV/√Hz en f = 10 kHz 6.5 nV/√Hz Current Noise Density in f = 1 kHz 0.05 pA/√Hz AD8691/AD8692/AD8694 Rev. E | Page 4 of 16 VS = 5.0 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 2. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS VCM = −0.3 V to +3.9 V 0.4 2.0 mV VCM = −0.1 V to +3.9 V; −40°C < TA < +125°C 3.0 mV Input Bias Current IB 0.2 1 pA −40°C < TA < +85°C 50 pA −40°C < TA < +125°C 260 pA Input Offset Current IOS 0.1 0.5 pA −40°C < TA < +85°C 20 pA −40°C < TA < +125°C 75 pA Input Voltage Range −0.3 +3.9 V Common-Mode Rejection Ratio CMRR VCM = −0.3 V to +3.9 V 70 95 dB VCM = −0.1 V to +3.9 V; −40°C < TA < +125°C 67 95 dB Large Signal Voltage Gain AVO AD8691/AD8692 VO = 0.5 V to 4.5 V, RL = 2 kΩ, VCM = 0 V 250 2000 V/mV AD8694 VO = 0.5 V to 4.5 V, RL = 2 kΩ, VCM = 0 V 150 V/mV Offset Voltage Drift ∆VOS/∆T AD8691 2 12 μV/°C AD8692/AD8694 1.3 6 μV/°C INPUT CAPACITANCE Common-Mode Input Capacitance CCM 5 pF Differential Input Capacitance CDM 2.5 pF OUTPUT CHARACTERISTICS Output Voltage High VOH IL = 1 mA 4.96 4.98 V IL = 10 mA 4.7 4.78 V −40°C to +125°C 4.6 V Output Voltage Low VOL IL = 1 mA 20 40 mV AD8691/AD8692 IL = 10 mA 165 210 mV AD8694 IL = 10 mA 185 240 mV AD8691/AD8692 −40°C to +125°C 290 mV AD8694 −40°C to +125°C 370 mV Short-Circuit Current ISC ±80 mA Closed-Loop Output Impedance ZOUT f = 1 MHz, AV = 1 10 Ω POWER SUPPLY Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 80 95 dB −40°C < TA < +125°C 75 95 dB Supply Current/Amplifier ISY VO = 0 V 0.95 1.05 mA −40°C < TA < +125°C 1.3 mA DYNAMIC PERFORMANCE Slew Rate SR RL = 2 kΩ 5 V/μs Settling Time tS To 0.01% 1 μs Full Power Bandwidth BWP <1% distortion 360 kHz Gain Bandwidth Product GBP 10 MHz Phase Margin Øm 65 Degrees Total Harmonic Distortion + Noise THD + N G = 1, RL = 600 Ω, f = 1 kHz, VO = 1 V p-p 0.0006 % NOISE PERFORMANCE Voltage Noise en p-p f = 0.1 Hz to 10 Hz 1.6 3.0 μV p-p Voltage Noise Density en f = 1 kHz 8 12 nV/√Hz en f = 10 kHz 6.5 nV/√Hz Current Noise Density in f = 1 kHz 0.05 pA/√Hz AD8691/AD8692/AD8694 Rev. E | Page 5 of 16 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. THERMAL CHARACTERISTICS θJA is specified for the worst-case conditions, that is, the device soldered in the circuit board for surface-mount packages. Table 3. Parameter Rating Supply Voltage 6 V Input Voltage VSS − 0.3 V to VDD + 0.3 V Differential Input Voltage ±6 V Output Short-Circuit Duration to GND Observe derating curves Storage Temperature Range −65°C to +150°C Operating Temperature Range −40°C to +125°C Junction Temperature Range −65°C to +150°C Lead Temperature (Soldering, 60 sec) 300°C Table 4. Thermal Resistance Package Type θJA θJC Unit 8-Lead MSOP (RM-8) 210 45 °C/W 8-Lead SOIC (R-8) 158 43 °C/W 5-Lead TSOT (UJ-5) 207 61 °C/W 5-Lead SC70 (KS-5) 376 126 °C/W 14-Lead TSSOP (RU-14) 180 35 °C/W 14-Lead SOIC (R-14) 120 36 °C/W ESD CAUTION 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. AD8691/AD8692/AD8694 Rev. E | Page 6 of 16 TYPICAL PERFORMANCE CHARACTERISTICS VS = +5 V or ±2.5 V, unless otherwise noted. N U M B ER O F A M PL IF IE R S VOS (mV) 04 99 1- 00 30 500 1000 1500 2000 2500 –2.0 –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0 VS = 5V VCM = –0.3V TO +3.9V Figure 7. Input Offset Voltage Distribution N U M B ER O F A M PL IF IE R S TCVOS (µV/°C) 04 99 1- 00 40 5 10 15 20 25 30 VS = 5V AND 2.7V VCM = 2.5V TA = –40°C TO +125°C 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.00 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Figure 8. AD8692/AD8694 Input Offset Voltage Drift Distribution –2000 –1600 –1200 –800 –400 0 400 800 1200 1600 2000 IN PU T O FF SE T VO LT A G E (µ V) –0.3 0 0.3 0.6 0.9 1.2 1.8 3.01.5 2.1 2.4 2.7 3.63.3 3.9 COMMON-MODE VOLTAGE (V) 04 99 1- 00 5 VS = 5V TA = 25°C Figure 9. Input Offset Voltage vs. Common-Mode Voltage I B (p A ) TEMPERATURE (°C) 04 99 1- 00 6–50 0 50 100 150 200 250 300 –40 –20 0 20 40 60 80 100 120–10 10 30 50 70 90 110–30 VS = 5V AND 2.7V Figure 10. Input Bias Current vs. Temperature 0 0.2 0.4 0.6 0.8 1.0 SU PP LY C U R R EN T (m A ) 0 1 2 3 4 5 6 7 VS (V) 0 49 91 -0 07 Figure 11. Supply Current vs. Supply Voltage 0 0.5 1.0 1.5 2.0 2.5 SU PP LY C U R R EN T (m A ) –40 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) 04 99 1- 00 8 VS = ±2.5V AND ±1.35V ISY @ ±2.5V ISY @ ±1.35V Figure 12. Supply Current vs. Temperature AD8691/AD8692/AD8694 Rev. E | Page 7 of 16 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 100 O U TP U T VO LT A G E TO S U PP LY R A IL (m V) LOAD CURRENT (mA) 04 99 1- 00 9 AD8691_92 SOURCE AD8694 SOURCE AD8694 SINK AD8691_92 SINK VS = 5V Figure 13. Output Voltage to Supply Rail vs. Load Current 0 5 10 15 20 25 30 35 O U TP U T VO LT A G E SW IN G (m V) –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 04 99 1- 01 0 VS = 5V AD8691_92 (VOL) AD8694 (VDD – VOH) AD8694 (VOL) AD8691_92 (VDD – VOH) Figure 14. Output Voltage Swing vs. Temperature (IL = 1 mA) 0 50 100 150 200 250 300 350 O U TP U T VO LT A G E SW IN G (m V) –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 04 99 1- 01 1 VS = 5V AD8691_92 (VOL) AD8694 (VDD – VOH) AD8694 (VOL) AD8691_92 (VDD – VOH) Figure 15. Output Voltage Swing vs. Temperature (IL = 10 mA) 1k 10k 100k 1M 10M O PE N -L O O P G A IN (d B ) FREQUENCY (Hz) 04 99 1- 01 2–40 –20 20 40 60 80 100 0 PH A SE (D eg re es ) –90 –45 45 90 0 VS = ±2.5V, ±1.35V RL = 2kΩ CL = 15pF Figure 16. Open-Loop Gain and Phase vs. Frequency 1k 10k 100k 1M 10M C M R R (d B ) FREQUENCY (Hz) 04 99 1- 01 30 40 60 80 100 120 20 VS = 5V AND 2.7V Figure 17. CMRR vs. Frequency PS R R (d B ) FREQUENCY (Hz) 04 99 1- 01 40 40 60 80 100 120 20 10 100 1k 10k 100k 1M 10M VS = 5V AND 2.7V Figure 18. PSRR vs. Frequency AD8691/AD8692/AD8694 Rev. E | Page 8 of 16 0.0001 0.001 0.01 0.1 1 10 100 1000 10000 100 1k 10k 100k 1M 10M IM PE D A N C E (Ω ) FREQUENCY (Hz) 04 99 1- 01 5 VS = ±2.5V AV = 100 AV = 10 AV = 1 Figure 19. Closed-Loop Output Impedance vs. Frequency O VE R SH O O T (% ) 1 10 100 1k LOAD CAPACITANCE (pF) 04 99 1- 01 60 5 10 15 20 25 30 35 40 VS = 5V AND 2.7V RL =∞ AV = –1 Figure 20. Small Signal Overshoot vs. Load Capacitance VO LT A G E (5 0m V/ D IV ) TIME (200ns/DIV) 04 99 1- 01 7 VS = ±2.5V, ±1.35V RL = 10kΩ CL = 200pF AV = 1 Figure 21. Small Signal Transient Response VO LT A G E (1 V/ D IV ) TIME (400ns/DIV) 04 99 1- 01 8 VS = 5V CL = 200pF RL =∞ AV = 1 Figure 22. Large Signal Transient Response V O UT (V ) TIME (400ns/DIV) 04 99 1- 01 9 VS = ±2.5V AV = –50 –2.5 100 0 0 V I N (m V) Figure 23. Positive Overload Recovery V O U T (V ) TIME (400ns/DIV) 04 99 1- 02 0 VS = ±2.5V AV = –50 2.5 –100 0 0 V I N (m V) Figure 24. Negative Overload Recovery AD8691/AD8692/AD8694 Rev. E | Page 9 of 16 0.0001 0.001 0.01 TH D + N (% ) 20 100 1k 10k 20k FREQUENCY (Hz) 04 99 1- 02 1 0.1 VS = ±2.5V AV = 1 VIN = 1V p-p BW = 20kHz RL = 1kΩ RL = 600Ω RL = 100kΩ Figure 25. THD + N vs. Frequency VO LT A G E N O IS E (1 µV /D IV ) TIME (1s/DIV) 04 99 1- 02 2 VS = 5V AND 2.7V Figure 26. 0.1 Hz to 10 Hz Input Voltage Noise N O IS E (n V/ H z) 1 100 10 1000 FREQUENCY (Hz) 101 100 1000 10000 04 99 1- 02 3 VS = ±2.5V AND ±1.35V Figure 27. Voltage Noise Density 1k 10k 100k 1M 10M C H A N N EL S EP A R A TI O N (d B ) FREQUENCY (Hz) 04 99 1- 02 480 90 110 120 130 140 150 100 VIN 28mV p-p V– –2.5V V+ +2.5V A BVOUT V+ V– R1 10kΩ R2 100Ω Figure 28. AD8692/AD8694 Channel Separation AD8691/AD8692/AD8694 Rev. E | Page 10 of 16 VS = +2.7 V or ±1.35 V, unless otherwise noted. N U M B ER O F A M PL IF IE R S VOS (mV) 04 99 1- 02 50 200 400 600 800 1000 1200 –2.0 –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0 VS = 2.7V VCM = –0.3V TO +1.6V Figure 29. Input Offset Voltage Distribution IN PU T O FF SE T VO LT A G E (µ V) COMMON-MODE VOLTAGE (V) 04 99 1- 02 6–2000 –1600 –1200 –800 –400 400 800 1200 1600 2000 –0.3 0 0.3 0.6 0.9 1.2 1.5 1.6 0 VS = 2.7V TA = 25°C Figure 30. Input Offset Voltage vs. Common-Mode Voltage 0.1 1 10 100 1k 10k 0.001 0.01 0.1 1 10 O U TP U T VO LT A G E TO S U PP LY R A IL (m V) LOAD CURRENT (mA) 04 99 1- 02 7 AD8691_92 SOURCE AD8694 SOURCE AD8694 SINK AD8691_92 SINK VS = 2.7V Figure 31. Output Voltage to Supply Rail vs. Load Current 0 10 20 30 40 50 60 O U TP U T VO LT A G E SW IN G (m V) –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 04 99 1- 02 8 VS = 2.7V AD8691_92 (VOL) AD8694 (VDD – VOH) AD8694 (VOL) AD8691_92 (VDD – VOH) Figure 32. Output Voltage Swing vs. Temperature (IL = 1 mA) VO LT A G E (5 00 m V/ D IV ) TIME (400ns/DIV) 04 99 1- 02 9 VS = 2.7V CL = 200pF RL =∞ AV = 1 Figure 33. Large Signal Transient Response AD8691/AD8692/AD8694 Rev. E | Page 11 of 16 OUTLINE DIMENSIONS COMPLIANT TO JEDEC STANDARDS MO-187-AA 6° 0° 0.80 0.55 0.40 4 8 1 5 0.65 BSC 0.40 0.25 1.10 MAX 3.20 3.00 2.80 COPLANARITY 0.10 0.23 0.09 3.20 3.00 2.80 5.15 4.90 4.65 PIN 1 IDENTIFIER 15° MAX0.95 0.85 0.75 0.15 0.05 10 -0 7- 20 09 -B Figure 34. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 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. COMPLIANT TO JEDEC STANDARDS MS-012-AA 01 24 07 -A 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 1.75 (0.0688) 1.35 (0.0532) SEATING PLANE 0.25 (0.0098) 0.10 (0.0040) 41 8 5 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) BSC 6.20 (0.2441) 5.80 (0.2284) 0.51