Micropower Precision CMOS Operational Amplifier AD8500 PIN CONFIGURATION Supply current: 1 μA maximum Offset voltage: 1 mV maximum Single-supply or dual-supply operation Rail-to-rail input and output No phase reversal Unity gain stable OUT A 1 V– 2 +IN 3 5 V+ 4 –IN AD8500 TOP VIEW (Not to Scale) 06005-001 FEATURES Figure 1. 5-Lead SC70 APPLICATIONS Portable equipment Remote sensors Low power filters Threshold detectors Current sensing GENERAL DESCRIPTION The AD8500 is a low power, precision CMOS op amp featuring a maximum supply current of 1 μA. The AD8500 has a maximum offset voltage of 1 mV and a typical input bias current of 1 pA; it operates rail-to-rail on both the input and output. The AD8500 can operate from a single-supply voltage of +1.8 V to +5.5 V or a dual-supply voltage of ±0.9 V to ±2.75 V. The ability to swing rail-to-rail at both the input and output helps maximize dynamic range and signal-to-noise ratio in systems that operate at very low voltages. The low offset voltage allows the AD8500 to be used in systems with high gain without having excessively large output offset errors, and it provides high accuracy without the need for system calibration. With its low power consumption, low input bias current, and rail-to-rail input and output, the AD8500 is ideally suited for a variety of battery-powered portable applications. Potential applications include ECGs, pulse monitors, glucose meters, smoke and fire detectors, vibration monitors, and backup battery sensors. The AD8500 is fully specified over the industrial temperature range (−40°C to +85°C) and is operational over the extended industrial temperature range (−40°C to +125°C). It is available in a 5-lead, SC70 surface-mount package. Table 1. Low Supply Current Op Amps Supply Current Single Dual Quad 1 μA AD8500 AD8502 AD8504 10 μA 20 μA ADA4505-2 ADA4505-4 AD8506 AD8508 Rev. B 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 ©2006–2009 Analog Devices, Inc. All rights reserved. AD8500 TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................5 Applications ....................................................................................... 1 Thermal Resistance .......................................................................5 General Description ......................................................................... 1 ESD Caution...................................................................................5 Pin Configuration ............................................................................. 1 Typical Performance Characteristics ..............................................6 Revision History ............................................................................... 2 Outline Dimensions ....................................................................... 12 Specifications..................................................................................... 3 Ordering Guide .......................................................................... 12 Electrical Characteristics ............................................................. 3 REVISION HISTORY 2/09—Rev. A to Rev. B Added Table 1; Renumbered Sequentially .................................... 1 Changes to Typical Performance Characteristics Section ........... 6 8/06—Rev. 0 to Rev. A Updated Format .................................................................. Universal Changes to Figure 17, Figure 18, and Figure 19 ........................... 8 4/06—Revision 0: Initial Version Rev. B | Page 2 of 12 AD8500 SPECIFICATIONS ELECTRICAL CHARACTERISTICS @ VS = 5 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Voltage Range Input Bias Current Symbol Conditions VOS ∆VOS/∆T 0 V < VCM < 5 V −40°C < TA < +85°C Min Typ Max Unit 0.235 3 1 10 +5.3 10 100 600 5 50 100 2 4.5 mV μV/°C V pA pA pA pA pA pA dB dB dB dB pF pF 4.995 4.960 0.85 6.5 ±5 V V mV mV mA −0.3 IB 1 −40°C < TA < +85°C −40°C < TA < +125°C Input Offset Current IOS Common-Mode Rejection Ratio CMRR Large Signal Voltage Gain AVO Input Capacitance CDIFF CCM OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Current POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density VOH VOL ISC PSRR ISY 0.5 −40°C < TA < +85°C −40°C < TA < +125°C 0 V < VCM < 5 V −40°C < TA < +85°C 0.1 V < VOUT < 4.9 V 0.1 V < VOUT < 4.9 V; −40°C < TA < +85°C RLOAD = 100 kΩ to GND RLOAD = 10 kΩ to GND RLOAD = 100 kΩ to VS RLOAD = 10 kΩ to VS VOUT = GND 4.970 4.900 1.8 V < VS < 5 V −40°C < TA < +85°C VO = VS/2 −40°C < TA < +85°C −40°C < TA < +125°C 90 80 SR GBP ØO en in 75 70 98 80 0.1 Hz to 10 Hz f = 1 kHz f = 1 kHz Rev. B | Page 3 of 12 90 90 120 5 15 110 0.75 1 1.5 2 dB dB μA μA μA 0.004 7 60 V/μs kHz Degrees 6 190 0.1 μV p-p nV/√Hz pA/√Hz AD8500 @ VS = 1.8 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Voltage Range Input Bias Current Symbol Conditions VOS ∆VOS/∆T 0 V < VCM < 1.8 V −40°C < TA < +85°C Min Typ Max Unit 0.235 3.5 1 12 +2.1 10 100 600 5 50 100 2 4.5 mV μV/°C V pA pA pA pA pA pA dB dB dB dB pF pF 1.798 1.783 V V −0.3 IB 1 −40°C < TA < +85°C −40°C < TA < +125°C Input Offset Current IOS Common-Mode Rejection Ratio CMRR Large Signal Voltage Gain AVO Input Capacitance CDIFF CCM OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Current POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density 0.5 −40°C < TA < +85°C −40°C < TA < +125°C 0 V < VCM < 1.8 V −40°C < TA < +85°C 0.1 V < VOUT < 1.7 V 0.1 V < VOUT < 1.7 V; −40°C < TA < +85°C VOH RLOAD = 100 kΩ to GND RLOAD = 10 kΩ to GND VOL RLOAD = 100 kΩ to VS RLOAD = 10 kΩ to VS 65 60 88 70 1.790 1.760 0.70 5 ±2 ISC PSRR ISY 1.8 V < VS < 5 V −40°C < TA < +85°C VO = VS/2 −40°C < TA < +85°C −40°C < TA < +125°C SR GBP ØO en in 0.1 Hz to 10 Hz f = 1 kHz f = 1 kHz Rev. B | Page 4 of 12 85 83 115 90 80 5 15 110 0.65 1 1.5 2 mV mV mA dB dB μA μA μA 0.004 7 60 V/μs kHz Degrees 6 190 0.1 μV p-p nV/√Hz pA/√Hz AD8500 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 4. Parameter Supply Voltage Input Voltage Differential Input Voltage Output Short-Circuit Duration to GND Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, 60 sec) Rating 6V VSS − 0.4 V to VDD + 0.4 V ±6 V Indefinite −65°C to +150°C −40°C to +125°C −65°C to +150°C 300°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. Absolute maximum ratings apply at 25°C, unless otherwise noted. THERMAL RESISTANCE θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 5. Thermal Characteristics Package Type 5-Lead SC70 (KS-5) θJA 376 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. B | Page 5 of 12 θJC 126 Unit °C/W AD8500 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. 1000 1200 VS = 5V AND 1.8V VS = 5V 0V < VCM < 5V 100 INPUT BIAS CURRENT (pA) 800 600 400 10 1 0.1 0.01 200 –750 –500 –250 0 250 500 1000 750 VOS (µV) 0.001 –40 06005-002 0 –1000 0 20 40 60 80 100 120 TEMPERATURE (°C) Figure 5. Input Bias Current vs. Temperature Figure 2. Input Offset Voltage Distribution 1000 12 IB (+125°C) VS = 5V –40°C < TA < +85°C VS = 5V 100 INPUT BIAS CURRENT (pA) 10 NUMBER OF AMPLIFIERS –20 06005-005 NUMBER OF AMPLIFIERS 1000 8 6 4 IB (+85°C) 10 1 IB (+25°C) 0.1 0.01 2 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 TCVOS (µV/°C) 4.5 5.0 5.5 6.0 0.001 06005-003 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCM (V) Figure 6. Input Bias Current vs. Common-Mode Voltage Figure 3. Input Offset Voltage Drift Distribution 1000 0 70 VS = 5V VS = 5V 800 60 NUMBER OF AMPLIFIERS 600 200 0 –200 –400 50 40 30 20 –600 10 –1000 0 1 2 3 VCM (V) 4 5 0 0.5 0.6 0.7 0.8 0.9 SUPPLY CURRENT (µA) Figure 7. Supply Current Distribution Figure 4. Input Offset Voltage vs. Common-Mode Voltage Rev. B | Page 6 of 12 1.0 06005-007 –800 06005-004 VOS (µV) 400 06005-006 IB (–40°C) AD8500 1000 1.0 VS = 5V 0.8 0.6 0.5 0.4 0.3 0.2 0 0 1 2 3 4 5 6 VS (V) 0.1 0.01 0.1 1 LOAD CURRENT (mA) Figure 11. Output Saturation Voltage vs. Load Current Figure 8. Supply Current vs. Supply Voltage 100 1.2 OUTPUT SATURATION VOLTAGE (mV) VS = 5V 1.0 ISY AT 5.0V 0.8 ISY (µA) SINK 1 0.01 0.001 06005-008 0.1 SOURCE 10 0.6 ISY AT 1.8V 0.4 0 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 10 VOL @ 10kΩ LOAD VOH @ 100kΩ LOAD 06005-009 0.2 VOH @ 10kΩ LOAD 1 VOL @ 100kΩ LOAD 0.1 –40 –15 10 35 60 85 TEMPERATURE (°C) 06005-012 ISY (µA) 0.7 100 06005-011 OUTPUT SATURATION VOLTAGE (mV) 0.9 Figure 12. Output Saturation Voltage vs. Temperature Figure 9. Supply Current vs. Temperature 80 900 120 VS = 5V VS = 5V PHASE 60 90 40 60 700 650 600 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 VCM (V) 5.0 GAIN 20 30 0 0 –20 –30 –40 –60 –60 –90 –80 10 100 1k 10k FREQUENCY (Hz) Figure 13. Open-Loop Gain and Phase vs. Frequency Figure 10. Supply Current vs. Input Common-Mode Voltage Rev. B | Page 7 of 12 –120 100k PHASE MARGIN (Degrees) 750 06005-010 ISY (nA) 800 06005-013 OPEN-LOOP GAIN (dB) 850 AD8500 120 0.20 VS = 5V 110 VS = 5V NO LOAD 0.15 100 90 0.10 VOLTAGE (V) CMRR (dB) 80 70 60 50 0.05 0 –0.05 40 30 –0.10 20 –0.15 0.1 1 10 100 FREQUENCY (kHz) –0.20 –0.0005 06005-014 0 0.01 0 0.0005 0.0010 0.0015 TIME (Seconds) Figure 14. CMRR vs. Frequency 06005-017 10 Figure 17. Small Signal Transient Response 0.20 100 VS = 5V 90 VS = 5V CL = 100pF 0.15 80 0.10 VOLTAGE (V) PSRR (dB) 70 60 50 40 0.05 0 –0.05 30 –0.10 20 0.1 1 10 100 FREQUENCY (kHz) –0.20 –0.0005 06005-015 0 0.01 0 0.0005 0.0010 Figure 18. Small Signal Transient Response Figure 15. PSRR vs. Frequency 6 35 VS = 5V NO LOAD VS = 5V 30 5 25 OS+ VOLTAGE (V) 4 20 OS– 15 3 2 10 0 10 100 LOAD CAPACITANCE (pF) 1000 0 –0.002 –0.001 0 0.001 0.002 0.003 0.004 0.005 0.006 TIME (Seconds) Figure 19. Large Signal Transient Response Figure 16. Small Signal Overshoot vs. Load Capacitance Rev. B | Page 8 of 12 0.007 0.008 06005-019 1 5 06005-016 OVERSHOOT (%) 0.0015 TIME (Seconds) 06005-018 –0.15 10 AD8500 1000 VS = 5V AND 1.8V VOUT 06005-020 GAIN = +1 VIN = VS/2 TIME (40µs/DIV) 100 10 1 10 100 1k Figure 23. Voltage Noise Density Figure 20. Turn-On Transient Response 500 4 VS = 1.8V 0V < VCM < 1.8V VS = 5V VOUT VIN 400 NUMBER OF AMPLIFIERS 3 2 VOLTAGE (V) 10k FREQUENCY (Hz) 06005-023 VOLTAGE NOISE DENSITY (nV/ Hz) VOLTAGE (2V/DIV) VS 1 0 –1 –2 300 200 100 –0.001 0.001 0.003 0.005 0.007 0.009 TIME (s) 0 –1000 06005-021 –4 –0.005 –0.003 –750 –500 –250 0 250 Figure 21. No Phase Reversal 750 1000 Figure 24. Input Offset Voltage Distribution 4 12 VS = 1.8V –40°C < TA < +85°C VS = 5V AND 1.8V 3 10 NUMBER OF AMPLIFIERS 2 1 0 –1 –2 8 6 4 2 –4 –5 –4 –3 –2 –1 0 1 2 3 TIME (Seconds) 4 5 Figure 22. 0.1 Hz to 10 Hz Input Voltage Noise 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 TCVOS (µV/°C) Figure 25. Input Offset Voltage Drift Distribution Rev. B | Page 9 of 12 06005-025 –3 06005-022 PEAK-TO-PEAK VOLTAGE (µV) 500 VOS (µV) 06005-024 –3 AD8500 700 1000 VS = 1.8V VS = 1.8V 800 600 650 200 ISY (nA) VOS (µV) 400 0 600 –200 –400 550 –600 0.3 0.6 0.9 1.2 1.5 1.8 VCM (V) 500 06005-026 0 0 1.2 1.5 1.8 1000 OUTPUT SATURATION VOLTAGE (mV) VS = 1.8V VS = 1.8V IB (+85°C) 10 IB (pA) 0.9 Figure 29. Supply Current vs. Input Common-Mode Voltage IB (+125°C) 100 1 0.6 VCM (V) Figure 26. Input Offset Voltage vs. Input Common-Mode Voltage 1000 0.3 06005-029 –800 –1000 IB (+25°C) 0.1 0.01 100 SOURCE 10 SINK 1 0.1 0.3 0.6 0.9 1.2 1.5 1.8 VCM (V) 0.01 0.001 06005-027 0.01 0.1 1 LOAD CURRENT (mA) Figure 27. Input Bias Current vs. Input Common-Mode Voltage Figure 30. Output Saturation Voltage vs. Load Current 100 70 VS = 1.8V OUTPUT SATURATION VOLTAGE (mV) VS = 1.8V 50 40 30 20 10 0 0.4 0.5 0.6 0.7 0.8 SUPPLY CURRENT (µA) 0.9 06005-028 NUMBER OF AMPLIFIERS 60 Figure 28. Supply Current Distribution VOH @ 10kΩ LOAD 10 VOL @ 10kΩ LOAD VOH @ 100kΩ LOAD 1 VOL @ 100kΩ LOAD 0.1 –40 –15 10 35 60 TEMPERATURE (°C) Figure 31. Output Saturation Voltage vs. Temperature Rev. B | Page 10 of 12 85 06005-031 0 06005-030 IB (–40°C) 0.001 AD8500 120 0.20 60 90 0.15 40 60 0.10 0 0 –20 –30 –40 –60 –60 –90 –80 10 100 1k 0.05 0 –0.05 –0.10 –0.15 –120 100k 10k VOLTAGE (V) PHASE MARGIN (Degrees) 30 GAIN –0.20 –0.0005 06005-032 OPEN-LOOP GAIN (dB) 20 VS = 1.8V NO LOAD VS = 1.8V PHASE FREQUENCY (Hz) 0 0.0005 0.0010 0.0015 TIME (Seconds) 06005-035 80 Figure 35. Small Signal Transient Response Figure 32. Open-Loop Gain and Phase vs. Frequency 0.20 100 VS = 1.8V 90 VS = 1.8V CL = 100pF 0.15 80 0.10 VOLTAGE (V) CMRR (dB) 70 60 50 40 0.05 0 –0.05 30 –0.10 20 0.1 1 10 100 FREQUENCY (kHz) –0.20 –0.0005 06005-033 0 0.01 0 0.0005 0.0010 Figure 36. Small Signal Transient Response Figure 33. CMRR vs. Frequency 35 2.0 VS = 1.8V VS = 1.8V NO LOAD 1.8 30 1.6 OS– 25 VOLTAGE (V) 1.4 20 OS+ 15 1.2 1.0 0.8 0.6 10 0.4 5 0 10 100 LOAD CAPACITANCE (pF) 1000 Figure 34. Small Signal Overshoot vs. Load Capacitance 0 –0.002 –0.001 0 0.001 0.002 0.003 0.004 0.005 0.006 TIME (Seconds) Figure 37. Large Signal Transient Response Rev. B | Page 11 of 12 0.007 0.008 06005-037 0.2 06005-034 OVERSHOOT (%) 0.0015 TIME (Seconds) 06005-036 –0.15 10 AD8500 OUTLINE DIMENSIONS 2.20 2.00 1.80 1.35 1.25 1.15 5 4 1 2 3 2.40 2.10 1.80 PIN 1 0.65 BSC 1.00 0.90 0.70 1.10 0.80 0.10 MAX 0.30 0.15 0.40 0.10 SEATING PLANE 0.46 0.36 0.26 0.22 0.08 0.10 COPLANARITY COMPLIANT TO JEDEC STANDARDS MO-203-AA Figure 38. 5-Lead Thin Shrink Small Outline Transistor Package [SC70] (KS-5) Dimensions shown in millimeters ORDERING GUIDE Model AD8500AKSZ-R2 1 AD8500AKSZ-REEL1 AD8500AKSZ-REEL71 1 Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C Package Description 5-Lead SC70 5-Lead SC70 5-Lead SC70 Z = RoHS Compliant Part. ©2006–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06005-0-2/09(B) Rev. B | Page 12 of 12 Package Option KS-5 KS-5 KS-5 Branding A0F A0F A0F