ANALOG DEVICES AD8500

Micropower Precision CMOS Operational Amplifier AD8500 FEATURES PIN CONFIGURATION Supply current: 1 μA maximum OUT A 1 5 V+ Offset voltage: 1 mV maximum AD8500 V– 2 TOP VIEW Single-supply or dual-supply operation (Not to Scale) +IN 3 4 –IN Rail-to-rail input and output No phase reversal Figure 1. 5-Lead SC70 Unity gain stable 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 The ability to swing rail-to-rail at both the input and output a maximum supply current of 1 μA. The AD8500 has a maximum helps maximize dynamic range and signal-to-noise ratio in offset voltage of 1 mV and a typical input bias current of 1 pA; it systems that operate at very low voltages. The low offset voltage operates rail-to-rail on both the input and output. The AD8500 allows the AD8500 to be used in systems with high gain without can operate from a single-supply voltage of +1.8 V to +5.5 V or having excessively large output offset errors, and it provides a dual-supply voltage of ±0.9 V to ±2.75 V. high accuracy without the need for system calibration. With its low power consumption, low input bias current, and The AD8500 is fully specified over the industrial temperature rail-to-rail input and output, the AD8500 is ideally suited for range (−40°C to +85°C) and is operational over the extended a variety of battery-powered portable applications. Potential industrial temperature range (−40°C to +125°C). It is available applications include ECGs, pulse monitors, glucose meters, in a 5-lead, SC70 surface-mount package. smoke and fire detectors, vibration monitors, and backup Table 1. Low Supply Current Op Amps battery sensors. Supply Current 1 μA 10 μA 20 μA Single AD8500 Dual AD8502 ADA4505-2 AD8506 Quad AD8504 ADA4505-4 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 ©2006–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 06005-001 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 Specif ica t ions ..................................................................................... 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 @ V = 5 V, V = V /2, T = 25°C, unless otherwise noted. S CM S A Table 2. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS 0 V < VCM < 5 V 0.235 1 mV Offset Voltage Drift ∆V/∆T −40°C < T < +85°C 3 10 μV/°C OS A Input Voltage Range −0.3 +5.3 V Input Bias Current IB 1 10 pA −40°C < TA < +85°C 100 pA −40°C < TA < +125°C 600 pA Input Offset Current I 0.5 5 pA OS −40°C < T < +85°C 50 pA A −40°C < T < +125°C 100 pA A Common-Mode Rejection Ratio CMRR 0 V < VCM < 5 V 75 90 dB −40°C < TA < +85°C 70 90 dB Large Signal Voltage Gain AVO 0.1 V < VOUT < 4.9 V 98 120 dB 0.1 V < V < 4.9 V; −40°C < T < +85°C 80 dB OUT A Input Capacitance C 2 pF DIFF CCM 4.5 pF OUTPUT CHARACTERISTICS Output Voltage High V R = 100 kΩ to GND 4.970 4.995 V OH LOAD RLOAD = 10 kΩ to GND 4.900 4.960 V Output Voltage Low VOL RLOAD = 100 kΩ to VS 0.85 5 mV RLOAD = 10 kΩ to VS 6.5 15 mV Short-Circuit Current I V = GND ±5 mA SC OUT POWER SUPPLY Power Supply Rejection Ratio PSRR 1.8 V < VS < 5 V 90 110 dB −40°C < T < +85°C 80 dB A Supply Current/Amplifier I V = V /2 0.75 1 μA SY O S −40°C < TA < +85°C 1.5 μA −40°C < TA < +125°C 2 μA DYNAMIC PERFORMANCE Slew Rate SR 0.004 V/μs Gain Bandwidth Product GBP 7 kHz Phase Margin ØO 60 Degrees NOISE PERFORMANCE Peak-to-Peak Noise 0.1 Hz to 10 Hz 6 μV p-p Voltage Noise Density en f = 1 kHz 190 nV/√Hz Current Noise Density i f = 1 kHz 0.1 pA/√Hz n Rev. B | Page 3 of 12 AD8500 @ V = 1.8 V, V = V /2, T = 25°C, unless otherwise noted. S CM S A Table 3. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS 0 V < VCM < 1.8 V 0.235 1 mV Offset Voltage Drift ∆V/∆T −40°C < T < +85°C 3.5 12 μV/°C OS A Input Voltage Range −0.3 +2.1 V Input Bias Current IB 1 10 pA −40°C < TA < +85°C 100 pA −40°C < TA < +125°C 600 pA Input Offset Current I 0.5 5 pA OS −40°C < T < +85°C 50 pA A −40°C < T < +125°C 100 pA A Common-Mode Rejection Ratio CMRR 0 V < VCM < 1.8 V 65 85 dB −40°C < TA < +85°C 60 83 dB Large Signal Voltage Gain AVO 0.1 V < VOUT < 1.7 V 88 115 dB 0.1 V < V < 1.7 V; −40°C < T < +85°C 70 dB OUT A Input Capacitance C 2 pF DIFF CCM 4.5 pF OUTPUT CHARACTERISTICS Output Voltage High V R = 100 kΩ to GND 1.790 1.798 V OH LOAD RLOAD = 10 kΩ to GND 1.760 1.783 V Output Voltage Low VOL RLOAD = 100 kΩ to VS 0.70 5 mV R = 10 kΩ to V 5 15 mV LOAD S Short-Circuit Current I ±2 mA SC POWER SUPPLY Power Supply Rejection Ratio PSRR 1.8 V < V < 5 V 90 110 dB S −40°C < T < +85°C 80 dB A Supply Current/Amplifier ISY VO = VS/2 0.65 1 μA −40°C < TA < +85°C 1.5 μA −40°C < TA < +125°C 2 μA DYNAMIC PERFORMANCE Slew Rate SR 0.004 V/μs Gain Bandwidth Product GBP 7 kHz Phase Margin Ø 60 Degrees O NOISE PERFORMANCE Peak-to-Peak Noise 0.1 Hz to 10 Hz 6 μV p-p Voltage Noise Density e f = 1 kHz 190 nV/√Hz n Current Noise Density i f = 1 kHz 0.1 pA/√Hz n Rev. B | Page 4 of 12 AD8500 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 4. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress Parameter Rating rating only; functional operation of the device at these or any Supply Voltage 6 V other conditions above those indicated in the operational Input Voltage V − 0.4 V to V + 0.4 V SS DD section of this specification is not implied. Exposure to absolute Differential Input Voltage ±6 V maximum rating conditions for extended periods may affect Output Short-Circuit Duration to GND Indefinite device reliability. Storage Temperature Range −65°C to +150°C Operating Temperature Range −40°C to +125°C Absolute maximum ratings apply at 25°C, unless other- Junction Temperature Range −65°C to +150°C wise noted. Lead Temperature (Soldering, 60 sec) 300°C THERMAL RESISTANCE θ is specified for the worst-case conditions, that is, a device JA soldered in a circuit board for surface-mount packages. Table 5. Thermal Characteristics Package Type θJA θJC Unit 5-Lead SC70 (KS-5) 376 126 °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. B | Page 5 of 12 AD8500 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. 1200 1000 V = 5V AND 1.8V V = 5V S S 0V < V < 5V CM 1000 100 10 800 1 600 400 0.1 200 0.01 0 0.001 000 –40 –20 0 20 40 60 80 100 120 –1000 –750 –500 –25001 250 500 750 TEMPERATURE (°C) V (µV) OS Figure 2. Input Offset Voltage Distribution Figure 5. Input Bias Current vs. Temperature 12 1000 I (+125°C) B V = 5V S –40°C < T < +85°C A V = 5V S 100 10 I (+85°C) B 8 10 6 1 I (+25°C) B 0.1 4 2 0.01 I (–40°C) B 0 0.001 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 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 TCV (µV/°C) V (V) CM OS Figure 6. Input Bias Current vs. Common-Mode Voltage Figure 3. Input Offset Voltage Drift Distribution 1000 70 V = 5V S V = 5V S 800 60 600 50 400 200 40 0 30 –200 –400 20 –600 10 –800 –1000 0 0.5 0.6 0.7 0.8 0.9 1.0 0 123 45 V (V) SUPPLY CURRENT (µA) CM Figure 4. Input Offset Voltage vs. Common-Mode Voltage Figure 7. Supply Current Distribution Rev. B | Page 6 of 12 NUMBER OF AMPLIFIERS V (µV) OS NUMBER OF AMPLIFIERS 06005-003 06005-004 06005-002 INPUT BIAS CURRENT (pA) INPUT BIAS CURRENT (pA) NUMBER OF AMPLIFIERS 06005-007 06005-005 06005-006 AD8500 1.0 1000 V = 5V S 0.9 100 0.8 0.7 SOURCE 10 0.6 0.5 SINK 0.4 1 0.3 0.1 0.2 0.1 0 0.01 0123456 0.001 0.01 0.1 1 V (V) LOAD CURRENT (mA) S Figure 11. Output Saturation Voltage vs. Load Current Figure 8. Supply Current vs. Supply Voltage 1.2 100 V = 5V S V @ 10kΩ LOAD OH 1.0 I AT 5.0V 10 0.8 SY V @ 10kΩ LOAD OL V @ 100kΩ LOAD OH 0.6 I AT 1.8V SY V @ 100kΩ LOAD OL 1 0.4 0.2 0.1 0 –40 –15 10 35 60 85 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) Figure 9. Supply Current vs. Temperature Figure 12. Output Saturation Voltage vs. Temperature 80 120 900 V = 5V V = 5V S S PHASE 60 90 850 40 60 800 20 GAIN 30 0 0 750 –30 –20 700 –40 –60 650 –90 –60 –120 –80 600 10 100 1k 10k 100k 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 FREQUENCY (Hz) V (V) CM Figure 13. Open-Loop Gain and Phase vs. Frequency Figure 10. Supply Current vs. Input Common-Mode Voltage Rev. B | Page 7 of 12 I (nA) I (µA) I (µA) SY SY SY 06005-010 06005-009 06005-008 OPEN-LOOP GAIN (dB) OUTPUT SATURATION VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (mV) 06005-012 06005-011 PHASE MARGIN (Degrees) 06005-013 20 20 AD8500 120 0.20 V = 5V V = 5V S S NO LOAD 0.15 100 90 0.10 80 0.05 70 60 0 50 –0.05 40 30 –0.10 –0.15 10 0 –0.20 0.01 0.1 1 10 100 –0.0005 0 0.0005 0.0010 0.0015 FREQUENCY (kHz) TIME (Seconds) Figure 14. CMRR vs. Frequency Figure 17. Small Signal Transient Response 100 0.20 V = 5V V = 5V S S 90 C = 100pF L 0.15 80 0.10 70 0.05 60 50 0 40 –0.05 30 –0.10 –0.15 10 0 –0.20 0.01 0.1 1 10 100 –0.0005 0 0.0005 0.0010 0.0015 FREQUENCY (kHz) TIME (Seconds) Figure 15. PSRR vs. Frequency Figure 18. Small Signal Transient Response 35 6 V = 5V V = 5V S S NO LOAD 30 5 25 OS+ 4 20 OS– 3 15 2 10 1 5 0 0 10 100 1000 –0.002 –0.001 0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 LOAD CAPACITANCE (pF) TIME (Seconds) Figure 19. Large Signal Transient Response Figure 16. Small Signal Overshoot vs. Load Capacitance Rev. B | Page 8 of 12 110 OVERSHOOT (%) PSRR (dB) CMRR (dB) 06005-014 06005-015 06005-016 VOLTAGE (V) VOLTAGE (V) VOLTAGE (V) 06005-018 06005-017 06005-019 AD8500 1000 V = 5V AND 1.8V S V S 100 V OUT GAIN = +1 V = V IN S/2 10 1 10 100 1k 10k TIME (40µs/DIV) FREQUENCY (Hz) Figure 23. Voltage Noise Density Figure 20. Turn-On Transient Response 500 4 V = 1.8V S V = 5V S 0V < V < 1.8V CM V 3 OUT V IN 400 2 1 300 0 200 –1 –2 100 –3 0 –4 –1000 –750 –500 –250 0 250 500 750 1000 –0.005 –0.003 –0.001 0.001 0.003 0.005 0.007 0.009 V (µV) TIME (s) OS Figure 21. No Phase Reversal Figure 24. Input Offset Voltage Distribution 4 12 V = 1.8V V = 5V AND 1.8V S S –40°C < T < +85°C A 3 10 2 8 1 0 6 –1 4 –2 2 –3 –4 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 –5 –4 –3 –2 –1 0 1 2 3 4 5 TIME (Seconds) TCV (µV/°C) OS Figure 22. 0.1 Hz to 10 Hz Input Voltage Noise Figure 25. Input Offset Voltage Drift Distribution Rev. B | Page 9 of 12 PEAK-TO-PEAK VOLTAGE (µV) VOLTAGE (V) VOLTAGE (2V/DIV) 06005-020 06005-021 06005-022 VOLTAGE NOISE DENSITY (nV/ Hz) NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS 06005-025 06005-024 06005-023 AD8500 1000 700 V = 1.8V V = 1.8V S S 800 600 650 400 200 0 600 –200 –400 550 –600 –800 500 –1000 0 0.3 0.6 0.9 1.2 1.5 1.8 0 0.3 0.60.91.21.51.8 V (V) V (V) CM CM Figure 26. Input Offset Voltage vs. Input Common-Mode Voltage Figure 29. Supply Current vs. Input Common-Mode Voltage 1000 1000 I (+125°C) B V = 1.8V S V = 1.8V S 100 100 SOURCE I (+85°C) B 10 10 1 I (+25°C) B SINK 1 0.1 0.1 0.01 I (–40°C) B 0.001 0.01 0 0.3 0.6 0.9 1.2 1.5 1.8 0.001 0.01 0.1 1 V (V) LOAD CURRENT (mA) CM Figure 27. Input Bias Current vs. Input Common-Mode Voltage Figure 30. Output Saturation Voltage vs. Load Current 100 70 V = 1.8V S V = 1.8V S 60 V @ 10kΩ LOAD OH 50 10 V @ 10kΩ LOAD OL 40 V @ 100kΩ LOAD OH 30 1 V @ 100kΩ LOAD OL 20 10 0.1 0 0.4 0.5 0.6 0.7 0.8 0.9 –40 –15 10 35 60 85 SUPPLY CURRENT (µA) TEMPERATURE (°C) Figure 28. Supply Current Distribution Figure 31. Output Saturation Voltage vs. Temperature Rev. B | Page 10 of 12 NUMBER OF AMPLIFIERS V (µV) I (pA) OS B 06005-028 06005-027 06005-026 I (nA) OUTPUT SATURATION VOLTAGE (mV) SY OUTPUT SATURATION VOLTAGE (mV) 06005-031 06005-030 06005-029 AD8500 0.20 80 120 V = 1.8V V = 1.8V S S PHASE NO LOAD 0.15 60 90 0.10 40 60 0.05 20 GAIN 30 0 0 0 –0.05 –20 –30 –0.10 –40 –60 –0.15 –60 –90 –120 –0.20 –80 10 100 1k 10k 100k –0.0005 0 0.0005 0.0010 0.0015 TIME (Seconds) FREQUENCY (Hz) Figure 35. Small Signal Transient Response Figure 32. Open-Loop Gain and Phase vs. Frequency 100 0.20 V = 1.8V V = 1.8V S S 90 C = 100pF 0.15 L 80 0.10 70 0.05 60 50 0 40 –0.05 30 –0.10 20 –0.15 10 –0.20 0 0.01 0.1 1 10 100 –0.0005 0 0.0005 0.0010 0.0015 FREQUENCY (kHz) TIME (Seconds) Figure 33. CMRR vs. Frequency Figure 36. Small Signal Transient Response 35 2.0 V = 1.8V V = 1.8V S S 1.8 NO LOAD 30 1.6 OS– 25 1.4 1.2 20 1.0 OS+ 15 0.8 0.6 10 0.4 5 0.2 0 0 10 100 1000 –0.002 –0.001 0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 LOAD CAPACITANCE (pF) TIME (Seconds) Figure 34. Small Signal Overshoot vs. Load Capacitance Figure 37. Large Signal Transient Response Rev. B | Page 11 of 12 OPEN-LOOP GAIN (dB) OVERSHOOT (%) CMRR (dB) 06005-033 06005-034 PHASE MARGIN (Degrees) 06005-032 VOLTAGE (V) VOLTAGE (V) VOLTAGE (V) 06005-036 06005-035 06005-037 0.10 MAX AD8500 OUTLINE DIMENSIONS 2.20 2.00 1.80 1.35 2.40 5 4 1.25 2.10 1.15 12 3 1.80 PIN 1 0.65 BSC 1.00 0.40 1.10 0.90 0.10 0.80 0.70 0.46 0.36 0.30 0.22 0.26 SEATING 0.15 0.08 PLANE 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 Temperature Range Package Description Package Option Branding 1 AD8500AKSZ-R2 −40°C to +125°C 5-Lead SC70 KS-5 A0F 1 AD8500AKSZ-REEL −40°C to +125°C 5-Lead SC70 KS-5 A0F 1 AD8500AKSZ-REEL7 −40°C to +125°C 5-Lead SC70 KS-5 A0F 1 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