1 μA Micropower CMOS Operational Amplifiers AD8502/AD8504 PIN CONFIGURATIONS Supply current: 1 μA maximum/amplifier Offset voltage: 3 mV maximum Single-supply or dual-supply operation Rail-to-rail input and output No phase reversal Unity gain stable OUT A 1 –IN A 2 V+ 8 AD8502 OUT B TOP VIEW +IN A 3 (Not to Scale) 6 –IN B V– 4 7 +IN B 5 06323-001 FEATURES APPLICATIONS Portable equipment Remote sensors Low power filters Threshold detectors Current sensing OUT A 1 14 OUT D –IN A 2 13 –IN D +IN A 3 AD8504 12 +IN D V+ 4 TOP VIEW (Not to Scale) 11 V– +IN B 5 10 +IN C –IN B 6 9 –IN C OUT B 7 8 OUT C 06323-038 Figure 1. 8-Lead SOT-23 Figure 2. 14-Lead TSSOP (RU-14) GENERAL DESCRIPTION The AD8502/AD8504 are low power, precision CMOS operational amplifiers featuring a maximum supply current of 1 μA per amplifier. The AD8502/AD8504 have a maximum offset voltage of 3 mV and a typical input bias current of 1 pA operating railto-rail on both the input and output. The AD8502/AD8504 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. With its low power consumption, low input bias current, and rail-to-rail input and output, the AD8502/AD8504 are ideally suited for a variety of battery-powered portable applications. Potential applications include bedside monitors, pulse monitors, glucose meters, smoke and fire detectors, vibration monitors, and backup battery sensors. without creating excessively large output offset errors. The AD8502 and AD8504 offer an additional benefit by providing high accuracy without the need for system calibration. The AD8502/AD8504 are fully specified over the industrial temperature range (−40°C to +85°C) and the extended industrial temperature range (−40°C to +125°C). The AD8502 is available in an 8-lead, SOT-23 surface-mount package. The AD8504 is available in a 14-lead TSSOP 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 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 use of the AD8502/AD8504 in systems with high gain Rev. A 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 ©2007–2009 Analog Devices, Inc. All rights reserved. AD8502/AD8504 TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................6 Applications ....................................................................................... 1 Thermal Resistance .......................................................................6 Pin Configurations ........................................................................... 1 ESD Caution...................................................................................6 General Description ......................................................................... 1 Typical Performance Characteristics ..............................................7 Revision History ............................................................................... 2 Outline Dimensions ....................................................................... 14 Specifications..................................................................................... 3 Ordering Guide .......................................................................... 14 Electrical Characteristics ............................................................. 3 REVISION HISTORY 2/09—Rev. 0 to Rev. A Changes to General Description Section ...................................... 1 Added Table 1; Renumbered Sequentially .................................... 1 Changes to Typical Performance Characteristics Section ........... 7 Updated Outline Dimensions ....................................................... 14 1/07—Revision 0: Initial Version Rev. A | Page 2 of 16 AD8502/AD8504 SPECIFICATIONS ELECTRICAL CHARACTERISTICS @ VS = 5 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions VOS Offset Voltage Drift ΔVOS/ΔT Input Bias Current IB Input Offset Current IOS 0 V < VCM < 5 V −40°C < TA < +85°C −40°C < TA < +125°C −40°C < TA < +85°C −40°C < TA < +125°C 0 V < VCM < 5 V −40°C < TA < +85°C −40°C < TA < +125°C 0 V < VCM < 5 V −40°C < TA < +85°C −40°C < TA < +125°C Input Voltage Range Common-Mode Rejection Ratio IVR 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 VOH VOL ISC PSRR ISY SR GBP ØO 0 V < VCM < 5 V −40°C < TA < +85°C −40°C to +125°C 0.1 V < VOUT < 4.9 V; RLOAD = 1 MΩ 0.1 V < VOUT < 4.9 V; −40°C < TA < +85°C 0.1 V < VOUT < 4.9 V; −40°C < TA < +125°C Min Typ Max Unit 0.5 3 5 5.5 mV mV mV μV/°C μV/°C pA pA pA pA pA pA V dB dB dB dB dB dB pF pF 7 5 1 0.5 0 67 65 65 98 93 75 10 100 600 5 50 100 5.0 76 120 2 4.5 RLOAD = 100 kΩ to GND −40°C < TA < +85°C −40°C to +125°C RLOAD = 10 kΩ to GND −40°C < TA < +85°C −40°C to +125°C RLOAD = 100 kΩ to VS −40°C < TA < +85°C −40°C to +125°C RLOAD = 10 kΩ to VS −40°C < TA < +85°C −40°C to +125°C VOUT = GND 4.970 4.960 4.950 4.900 4.810 4.650 1.8 V < VS < 5 V −40°C < TA < +85°C −40°C < TA < +125°C VO = VS/2 −40°C < TA < +85°C −40°C < TA < +125°C 85 66 66 RLOAD = 1 MΩ Rev. A | Page 3 of 16 4.990 4.930 1.6 15 5 7 7 20 37 40 ±5 105 0.75 0.004 7 60 1 1.5 2 V V V V V V mV mV mV mV mV mV mA dB dB dB μA μA μA V/μs kHz Degrees AD8502/AD8504 Parameter NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density Symbol Conditions en in 0.1 Hz to 10 Hz f = 1 kHz f = 1 kHz Min Typ Max 6 190 0.1 Unit μV p-p nV/√Hz pA/√Hz @ VS = 1.8 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions VOS Offset Voltage Drift ∆VOS/∆T Input Bias Current IB Input Offset Current IOS 0 V < VCM < 1.8 V −40°C < TA < +85°C −40°C < TA < +125°C −40°C < TA < +85°C −40°C < TA < +125°C 0 V < VCM < 1.8 V −40°C < TA < +85°C −40°C < TA < +125°C 0 V < VCM < 1.8 V −40°C < TA < +85°C −40°C < TA < +125°C Input Voltage Range Common-Mode Rejection Ratio IVR 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 VOH VOL 0 V < VCM < 1.8 V −40°C < TA < +85°C −40°C < TA < +125°C 0.1 V < VOUT < 1.7 V; RLOAD = 1 MΩ 0.1 V < VOUT < 1.7 V; −40°C < TA < +85°C 0.1 V < VOUT < 1.7 V; −40°C < TA < +125°C Min ISY Max Unit 0.5 3 5 5.5 mV mV mV μV/°C μV/°C pA pA pA pA pA pA V dB dB dB dB dB dB pF pF 7 5 1 0.5 0 59 56 55 88 80 65 10 100 600 5 50 100 1.8 75 110 2 4.5 RLOAD = 100 kΩ to GND −40°C < TA < +85°C −40°C to +125°C RLOAD = 10 kΩ to GND 1.79 1.78 1.77 1.75 −40°C < TA < +85°C 1.70 V −40°C to +125°C 1.65 V RLOAD = 100 kΩ to VS −40°C < TA < +85°C −40°C to +125°C RLOAD = 10 kΩ to VS −40°C < TA < +85°C −40°C to +125°C 1.795 V V V V 1.764 1.0 10 ISC PSRR Typ 5 6 7 20 28 29 ±5 1.8 V < VS < 5 V −40°C < TA < +85°C −40°C < TA < +125°C VO = VS/2 −40°C < TA < +85°C −40°C < TA < +125°C Rev. A | Page 4 of 16 85 66 66 105 0.65 1 1.5 2 mV mV mV mV mV mV mA dB dB dB μA μA μA AD8502/AD8504 Parameter DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density Symbol Conditions SR GBP ØO RLOAD = 1 MΩ 0.004 7 60 V/μs kHz Degrees 0.1 Hz to 10 Hz f = 1 kHz f = 1 kHz 6 190 0.1 μV p-p nV/√Hz pA/√Hz en in Rev. A | Page 5 of 16 Min Typ Max Unit AD8502/AD8504 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. THERMAL RESISTANCE Table 4. θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. 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 − 0.3 V to VDD + 0.3 V ±6 V Indefinite −65°C to +150°C −40°C to +125°C −65°C to +150°C 300°C Table 5. Thermal Characteristics Package Type 8-Lead SOT-23 (RJ-8) 14-Lead TSSOP (RU-14) 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. Absolute maximum ratings apply at 25°C, unless otherwise noted. Rev. A | Page 6 of 16 θJA 376 180 θJC 126 35 Unit °C/W °C/W AD8502/AD8504 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. 1000 160 140 INPUT BIAS CURRENT (pA) 100 100 80 60 40 10 1 0.1 0.01 20 –600 0 600 1200 1800 0.001 –40 06323-002 0 –2400 –1800 –1200 2400 VOS (µV) –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 06323-005 NUMBER OF AMPLIFIERS 120 Figure 6. Input Bias Current vs. Temperature (VS = 1.8 V and 5.0 V) Figure 3. Input Offset Voltage Distribution (0 V < VCM < 5.0 V), VS = 5 V 200 1000 IB (+125°C) 100 50 IB (+85°C) 10 1 IB (+25°C) 0.1 0.01 1 3 5 7 9 11 13 15 17 TCVOS (µV/°C) 19 21 23 25 0.001 06323-003 0 IB (–40°C) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 06323-006 INPUT BIAS CURRENT (pA) NUMBER OF AMPLIFIERS 100 150 5.0 VCM (V) Figure 7. Input Bias Current vs. Common-Mode Voltage, VS = 5 V Figure 4. Input Offset Voltage Temperature Drift Distribution (−40°C < TA < +85°C), VS = 5 V 70 1000 800 60 NUMBER OF AMPLIFIERS 600 VOS (µV) 400 200 0 –200 –400 50 40 30 20 –600 0 1 2 3 VCM (V) 4 0 0.5 5 0.6 0.7 0.8 0.9 ISY (µA) Figure 8. Supply Current Distribution, VS = 5 V Figure 5. Input Offset Voltage vs. Common-Mode Voltage, VS = 5 V Rev. A | Page 7 of 16 1.0 06323-007 –1000 10 06323-004 –800 AD8502/AD8504 1000 OUTPUT SATURATION VOLTAGE (mV) 0.9 0.8 0.7 0.5 0.4 0.3 0.2 0.1 0 1 2 3 4 5 6 VS (V) 0.1 0.01 0.001 1 100 ISY @ 1.8V 0.4 0 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) VOH @ 100kΩ LOAD 06323-009 0.2 VOL @ 10kΩ LOAD 1 VOL @ 100kΩ LOAD 0.1 –40 –15 10 35 60 Figure 13. Output Saturation Voltage vs. Temperature, VS = 5 V Figure 10. Supply Current vs. Temperature 900 120 80 PHASE 60 OPEN-LOOP GAIN (dB) 850 800 750 700 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCM (V) 06323-010 650 0 85 TEMPERATURE (°C) 90 60 40 20 30 GAIN 0 0 –20 –30 –40 –60 –60 –90 –80 10 100 1k 10k –120 100k FREQUENCY (Hz) Figure 14. Open-Loop Gain and Phase vs. Frequency, VS = 5 V Figure 11. Supply Current vs. Input Common-Mode Voltage, VS = 5 V Rev. A | Page 8 of 16 PHASE MARGIN (Degrees) 0.6 10 06323-012 ISY @ 5.0V 0.8 VOH @ 10kΩ LOAD OUTPUT SATURATION VOLTAGE (mV) 1.0 ISY (µA) 0.1 Figure 12. Output Saturation Voltage vs. Load Current, VS = 5 V 1.2 ISY (nA) 0.01 LOAD CURRENT (mA) Figure 9. Supply Current vs. Supply Voltage 600 SINK 1 06323-008 0 SOURCE 10 06323-013 ISY (µA) 0.6 100 06323-011 1.0 AD8502/AD8504 120 0.20 110 0.15 100 90 0.10 VOLTAGE (V) 70 60 50 40 30 0 –0.05 –0.10 20 –0.15 10 0.1 1 10 FREQUENCY (kHz) –0.20 –0.5 06323-014 0 0.01 0.05 0 0.5 1.0 06323-017 CMRR (dB) 80 1.5 TIME (ms) Figure 15. CMRR vs. Frequency, VS = 5 V Figure 18. Small Signal Transient Response (No Load), VS = 5 V 0.20 100 90 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 FREQUENCY (kHz) –0.20 –0.5 06323-015 0 0.01 6 30 5 OS+ 1.5 VOLTAGE (V) 4 OS– 15 3 2 10 0 10 100 1000 LOAD CAPACITANCE (pF) 0 –2 –1 0 1 2 3 4 5 6 7 8 TIME (ms) Figure 20. Large Signal Transient Response No Load), VS = 5 V Figure 17. Small Signal Overshoot vs. Load Capacitance, VS = 5 V Rev. A | Page 9 of 16 06323-019 1 5 06323-016 OVERSHOOT (%) 1.0 Figure 19. Small Signal Transient Response (100 pF Load Capacitance, VS = 5 V) 35 20 0.5 TIME (ms) Figure 16. PSRR vs. Frequency, VS = 5 V 25 0 06323-018 –0.15 10 AD8502/AD8504 1000 VOUT 06323-020 GAIN = +1 VIN = VS/2 TIME (40µs/DIV) 100 10 1 100 1k FREQUENCY (Hz) Figure 24. Input Voltage Noise (VS = 5 V and 1.8 V) Figure 21. Turn-On Transient Response, VS = 5 V 4 160 VOUT VIN 3 140 NUMBER OF AMPLIFIERS 2 1 0 –1 –2 –3 120 100 80 60 40 20 –0.001 0.001 0.003 0.005 0.007 0 –2400 06323-021 –4 –0.005 –0.003 0.009 TIME (s) 06323-024 VOLTAGE (V) 10 06323-023 VOLTAGE NOISE DENSITY (nV/ Hz) VOLTAGE (2V/DIV) VS –1800 –1200 –600 0 600 VOS (µV) 1200 1800 2400 Figure 25. Input Offset Voltage Distribution (0 V < VCM < 1.8 V), VS = 1.8 V Figure 22. No Phase Reversal, VS = 5 V 200 4 NUMBER OF AMPLIFIERS 2 1 0 –1 –2 150 100 50 –4 –5 –4 –3 –2 –1 0 1 2 3 4 5 TIME (s) Figure 23. 0.1 Hz to 10 Hz Input Voltage Noise (VS = 5 V and 1.8 V) 0 1 3 5 7 9 11 13 15 17 TCVOS (µV/°C) 19 21 23 25 Figure 26. Input Offset Voltage Temperature Drift Distribution (−40°C < TA < +85°C), VS = 1.8 V Rev. A | Page 10 of 16 06323-025 –3 06323-022 PEAK-TO-PEAK VOLTAGE (µV) 3 AD8502/AD8504 700 1000 800 600 650 200 ISY (nA) VOS (µV) 400 0 600 –200 –400 550 –800 0.3 0.6 0.9 1.2 1.5 500 1.8 0 0.3 0.6 0.9 VCM (V) Figure 27. Input Offset Voltage vs. Input Common-Mode Voltage, VS = 1.8 V 1000 OUTPUT SATURATION VOLTAGE (mV) IB (+85°C) IB (pA) IB (+25°C) 0.1 0.01 IB (–40°C) 0.3 0.6 0.9 1.2 1.5 1.8 VCM (V) 10 SINK 1 0.1 0.01 0.1 1 Figure 31. Output Saturation Voltage vs. Load Current VS = 1.8 V 100 OUTPUT SATURATION VOLTAGE (mV) 70 60 50 40 30 20 10 0.5 0.6 0.7 0.8 ISY (µA) 0.9 06323-028 NUMBER OF AMPLIFIERS SOURCE LOAD CURRENT (mA) Figure 28. Input Bias Current vs. Input Common-Mode Voltage, VS = 1.8 V 0 0.4 100 0.01 0.001 06323-027 0 1.8 1000 10 0.001 1.5 Figure 30. Supply Current vs. Input Common-Mode Voltage, VS = 1.8 V IB (+125°C) 100 1 1.2 VCM (V) 06323-030 0 VOH @ 10kΩ LOAD 10 VOL @ 10kΩ LOAD VOH @ 100kΩ LOAD 1 VOL @ 100kΩ LOAD 0.1 –40 –15 10 35 60 85 TEMPERATURE (°C) Figure 32. Output Saturation Voltage vs. Temperature, VS = 1.8 V Figure 29. Supply Current Distribution, VS = 1.8 V Rev. A | Page 11 of 16 06323-031 –1000 06323-029 06323-026 –600 AD8502/AD8504 35 90 30 30 GAIN 0 0 –20 –30 –40 –60 –60 –90 –80 10 100 1k 10k 20 OS+ 15 10 5 –120 100k 0 10 FREQUENCY (Hz) 100 1000 LOAD CAPACITANCE (pF) Figure 33. Open-Loop Gain and Phase vs. Frequency, VS = 1.8 V 06323-034 20 OS– 25 OVERSHOOT (%) 60 40 Figure 35. Small Signal Overshoot vs. Load Capacitance, VS = 1.8 V 100 0.20 90 0.15 80 0.10 VOLTAGE (V) 70 60 50 40 0.05 0 –0.05 30 –0.10 20 0.1 1 –0.20 –0.5 10 FREQUENCY (kHz) 0 0.5 1.0 1.5 TIME (ms) Figure 36. Small Signal Transient Response (No Load), VS = 1.8 V Figure 34. CMRR vs. Frequency, VS = 1.8 V Rev. A | Page 12 of 16 06323-035 10 0 0.01 –0.15 06323-033 CMRR (dB) OPEN-LOOP GAIN (dB) 60 120 PHASE MARGIN (Degrees) PHASE 06323-032 80 AD8502/AD8504 0 0.20 –10 0.15 CHANNEL SEPARATION (dB) 0.05 0 –0.05 –0.10 –40 + VIN 10kΩ 10kΩ A –50 10kΩ + B, C, AND D –60 –70 –80 –90 OUT C OUT D OUT B 0 0.5 1.0 06323-036 –110 –0.20 –0.5 1.5 TIME (ms) Figure 37. Small Signal Transient Response (100 pF Load Capacitance), VS = 1.8 V 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 –1 0 1 2 3 4 5 6 7 8 TIME (ms) 06323-037 VOLTAGE (V) –30 – –100 –0.15 0 –2 – 06323-039 VOLTAGE (V) 0.10 1MΩ 1V p-p –20 Figure 38. Large Signal Transient Response (No Load), VS = 1.8 V Rev. A | Page 13 of 16 –120 60 100 200 500 1k 2k FREQUENCY (Hz) Figure 39. Channel Separation 5k 10k 20k AD8502/AD8504 OUTLINE DIMENSIONS 3.00 2.90 2.80 1.70 1.60 1.50 8 7 6 5 1 2 3 4 3.00 2.80 2.60 PIN 1 INDICATOR 0.65 BSC 1.95 BSC 1.45 MAX 0.95 MIN 0.15 MAX 0.05 MIN 0.22 MAX 0.08 MIN 8° 4° 0° SEATING PLANE 0.38 MAX 0.22 MIN 0.60 0.45 0.30 0.60 BSC 121608-A 1.30 1.15 0.90 COMPLIANT TO JEDEC STANDARDS MO-178-BA Figure 40. 8-Lead Small Outline Transistor Package [SOT-23] (RJ-8) Dimensions shown in millimeters 5.10 5.00 4.90 14 8 4.50 4.40 4.30 6.40 BSC 1 7 PIN 1 0.65 BSC 1.20 MAX 0.15 0.05 COPLANARITY 0.10 0.30 0.19 SEATING PLANE 0.20 0.09 8° 0° COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 0.75 0.60 0.45 061908-A 1.05 1.00 0.80 Figure 41. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters ORDERING GUIDE Model AD8502ARJZ-R21 AD8502ARJZ-REEL1 AD8502ARJZ-REEL71 AD8504ARUZ1 AD8504ARUZ-REEL1 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 SOT-23 8-Lead SOT-23 8-Lead SOT-23 14-Lead TSSOP 14-Lead TSSOP Z = RoHS Compliant Part. Rev. A | Page 14 of 16 Package Option RJ-8 RJ-8 RJ-8 RU-14 RU-14 Branding A1D A1D A1D AD8502/AD8504 NOTES Rev. A | Page 15 of 16 AD8502/AD8504 NOTES ©2007–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06323-0-2/09(A) Rev. A | Page 16 of 16