AD8502_07

1 μA Micropower CMOS Operational Amplifiers AD8502/AD8504 FEATURES 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 PIN CONFIGURATIONS OUT A 1 –IN A 2 8 V+ V– 4 5 +IN B Figure 1. 8-Lead SOT-23 OUT A –IN A +IN A V+ +IN B –IN B OUT B 1 2 3 4 5 6 7 APPLICATIONS Portable equipment Remote sensors Low power filters Threshold detectors Current sensing 14 13 OUT D –IN D +IN D V– +IN C –IN C OUT C 06323-038 AD8504 TOP VIEW (Not to Scale) 12 11 10 9 8 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. The AD8502/AD8504 have a maximum offset voltage of 3 mV and a typical input bias current of 1 pA operating rail-to-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. 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 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. 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. 06323-001 OUT B TOP VIEW +IN A 3 (Not to Scale) 6 –IN B 7 AD8502 AD8502/AD8504 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics............................................................. 3 Absolute Maximum Ratings ............................................................6 Thermal Resistance .......................................................................6 ESD Caution...................................................................................6 Typical Performance Characteristics ..............................................7 Outline Dimensions ....................................................................... 14 Ordering Guide .......................................................................... 14 REVISION HISTORY 1/07—Revision 0: Initial Version Rev. 0 | Page 2 of 16 AD8502/AD8504 SPECIFICATIONS ELECTRICAL CHARACTERISTICS @ VS = 5 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol VOS Conditions 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 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 0 67 65 65 98 93 75 Min Typ 0.5 Max 3 5 5.5 Unit mV mV mV μV/°C μV/°C pA pA pA pA pA pA V dB dB dB dB dB dB pF pF V V V V V V mV mV mV mV mV mV mA dB dB dB μA μA μA V/μs kHz Degrees Offset Voltage Drift Input Bias Current ΔVOS/ΔT IB 7 5 1 Input Offset Current IOS 0.5 Input Voltage Range Common-Mode Rejection Ratio IVR CMRR 10 100 600 5 50 100 5.0 76 Large Signal Voltage Gain AVO 120 Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High CDIFF CCM VOH 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 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 RLOAD = 1 MΩ 4.970 4.960 4.950 4.900 4.810 4.650 2 4.5 4.990 4.930 Output Voltage Low VOL 1.6 15 5 7 7 20 37 40 Short-Circuit Current POWER SUPPLY Power Supply Rejection Ratio ISC PSRR ±5 85 66 66 105 Supply Current/Amplifier ISY 0.75 1 1.5 2 DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin SR GBP ØO 0.004 7 60 Rev. 0 | Page 3 of 16 AD8502/AD8504 Parameter NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density Symbol Conditions 0.1 Hz to 10 Hz f = 1 kHz f = 1 kHz Min Typ 6 190 0.1 Max Unit μV p-p nV/√Hz pA/√Hz en in @ VS = 1.8 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol VOS Conditions 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 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 0 59 56 55 88 80 65 Min Typ 0.5 Max 3 5 5.5 Unit mV mV mV μV/°C μV/°C pA pA pA pA pA pA V dB dB dB dB dB dB pF pF V V V V V V 1.0 5 6 7 20 28 29 mV mV mV mV mV mV mA dB dB dB μA μA μA Offset Voltage Drift Input Bias Current ∆VOS/∆T IB 7 5 1 Input Offset Current IOS 0.5 Input Voltage Range Common-Mode Rejection Ratio IVR CMRR 10 100 600 5 50 100 1.8 75 Large Signal Voltage Gain AVO 110 Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High CDIFF CCM VOH 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 1.79 1.78 1.77 1.75 1.70 1.65 2 4.5 1.795 1.764 Output Voltage Low VOL 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 10 Short-Circuit Current POWER SUPPLY Power Supply Rejection Ratio ISC PSRR 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. 0 | Page 4 of 16 ±5 85 66 66 105 Supply Current/Amplifier ISY 0.65 1 1.5 2 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 SR GBP ØO Conditions RLOAD = 1 MΩ Min Typ 0.004 7 60 6 190 0.1 Max Unit V/μs kHz Degrees μV p-p nV/√Hz pA/√Hz en in 0.1 Hz to 10 Hz f = 1 kHz f = 1 kHz Rev. 0 | Page 5 of 16 AD8502/AD8504 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 3. 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 THERMAL RESISTANCE θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 4. Thermal Characteristics Package Type 8-Lead SOT-23 (RJ-8) 14-Lead TSSOP (RU-14) θJA 376 180 θJC 126 35 Unit °C/W °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. Absolute maximum ratings apply at 25°C, unless otherwise noted. Rev. 0 | Page 6 of 16 AD8502/AD8504 TYPICAL PERFORMANCE CHARACTERISTICS 160 140 1000 100 INPUT BIAS CURRENT (pA) NUMBER OF AMPLIFIERS 120 100 80 60 40 20 0 –2400 –1800 –1200 10 1 0.1 0.01 –600 0 VOS (µV) 600 1200 1800 2400 06323-002 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) Figure 3. Input Offset Voltage Distribution (0 V < VC < 5.0 V), VS = 5 V 200 Figure 6. Input Bias Current vs. Temperature (VS = 1.8 V and 5.0 V) 1000 IB (+125°C) 100 INPUT BIAS CURRENT (pA) NUMBER OF AMPLIFIERS 150 IB (+85°C) 10 100 1 IB (+25°C) 0.1 50 0.01 IB (–40°C) 06323-003 1 3 5 7 9 11 13 15 17 TCVOS (µV/°C) 19 21 23 25 0 0.5 1.0 1.5 2.0 2.5 VCM (V) 3.0 3.5 4.0 4.5 5.0 Figure 4. Input Offset Voltage Temperature Drift Distribution (−40°C < TA < +85°C), VS = 5 V 1000 800 600 Figure 7. Input Bias Current vs. Common-Mode Voltage, VS = 5 V 70 60 NUMBER OF AMPLIFIERS 400 VOS (µV) 200 0 –200 –400 –600 –800 –1000 0 1 2 3 VCM (V) 4 5 06323-004 50 40 30 20 10 0 0.5 0.6 0.7 0.8 ISY (µA) 0.9 1.0 Figure 5. Input Offset Voltage vs. Common-Mode Voltage, VS = 5 V Figure 8. Supply Current Distribution, VS = 5 V Rev. 0 | Page 7 of 16 06323-007 06323-006 0 0.001 06323-005 0.001 –40 AD8502/AD8504 1.0 1000 OUTPUT SATURATION VOLTAGE (mV) 0.9 0.8 0.7 0.6 100 SOURCE 10 ISY (µA) 0.5 0.4 0.3 0.2 0.1 0 1 2 3 VS (V) 4 5 6 06323-008 1 SINK 0.1 0.01 0.1 1 LOAD CURRENT (mA) Figure 9. Supply Current vs. Input Common-Mode Voltage Figure 12. Output Saturation Voltage vs. Load Current, VS = 5 V 1.2 100 1.0 0.8 ISY @ 5.0V OUTPUT SATURATION VOLTAGE (mV) VOH @ 10kΩ LOAD 10 VOL @ 10kΩ LOAD VOH @ 100kΩ LOAD ISY (µA) 0.6 ISY @ 1.8V 0.4 1 VOL @ 100kΩ LOAD 0.2 06323-009 –25 –10 5 20 35 50 65 80 95 110 125 –15 10 35 60 85 TEMPERATURE (°C) TEMPERATURE (°C) Figure 10. Supply Current vs. Temperature 900 Figure 13. Output Saturation Voltage vs. Temperature, VS = 5 V 80 60 40 20 0 –20 –40 –60 –80 10 120 90 850 OPEN-LOOP GAIN (dB) 800 30 0 –30 –60 –90 –120 100k 750 700 650 0 0.5 1.0 1.5 2.0 2.5 VCM (V) 3.0 3.5 4.0 4.5 5.0 06323-010 100 1k FREQUENCY (Hz) 10k Figure 11. Supply Current vs. Input Common-Mode Voltage, VS = 5 V Figure 14. Open-Loop Gain and Phase vs. Frequency, VS = 5 V Rev. 0 | Page 8 of 16 06323-013 600 PHASE MARGIN (Degrees) 60 ISY (nA) 06323-012 0 –40 0.1 –40 06323-011 0 0.01 0.001 AD8502/AD8504 120 0.20 0.15 0.10 0.05 VOUT (V) 110 100 90 80 CMRR (dB) 70 60 50 40 30 0 –0.05 –0.10 –0.15 –0.20 –0.5 20 10 06323-014 0.1 FREQUENCY (kHz) 1 10 0 0.5 TIME (ms) 1.0 1.5 Figure 15. CMRR vs. Frequency, VS = 5 V 100 90 80 Figure 18. Small Signal Transient Response (No Load), VS = 5 V 0.20 0.15 0.10 70 PSRR (dB) VOUT (V) 60 50 40 30 0.05 0 –0.05 –0.10 20 10 06323-015 –0.15 –0.20 –0.5 0.1 FREQUENCY (kHz) 1 10 0 0.5 TIME (ms) 1.0 1.5 Figure 16. PSRR vs. Frequency, VS = 5 V 35 30 25 OVERSHOOT (%) Figure 19. Small Signal Transient Response (100 pF Load Capacitance, VS = 5 V) 6 5 OS+ VOUT (V) 4 20 15 10 5 0 10 OS– 3 2 1 06323-016 100 LOAD CAPACITANCE (pF) 1000 –1 0 1 2 3 TIME (ms) 4 5 6 7 8 Figure 17. Small Signal Overshoot vs. Load Capacitance, VS = 5 V Figure 20. Large Signal Transient Response No Load), VS = 5 V Rev. 0 | Page 9 of 16 06323-019 0 –2 06323-018 0 0.01 06323-017 0 0.01 AD8502/AD8504 1000 VS VOLTAGE NOISE DENSITY (nV/ Hz) 06323-020 100ms/DIV 100 VOUT GAIN = +1 VIN = VS/2 TIME (s) 1 10 100 FREQUENCY (Hz) 1k Figure 21. Turn-On Transient Response, VS = 5 V 4 3 2 1 0 –1 –2 –3 –4 –0.005 –0.003 VOUT VIN NUMBER OF AMPLIFIERS 160 140 120 100 80 60 40 Figure 24. Input Voltage Noise (VS = 5 V and 1.8 V) OUTPUT VOLTAGE (V) –0.001 0.001 0.003 0.005 0.007 0.009 06323-021 0 –2400 –1800 –1200 –600 TIME (s) 0 600 VOS (µV) 1200 1800 2400 Figure 22. No Phase Reversal, VS = 5 V Figure 25. Input Offset Voltage Distribution (0 V < VCM < 1.8 V), VS = 1.8 V 4 3 PEAK-TO-PEAK VOLTAGE (µV) NUMBER OF AMPLIFIERS 200 2 1 0 –1 –2 –3 06323-022 150 100 50 –4 –3 –2 –1 0 TIME (s) 1 2 3 4 5 1 3 5 7 9 11 13 15 17 TCVOS (µV/°C) 19 21 23 25 Figure 23. 0.1 Hz to 10 Hz Input Voltage Noise (VS = 5 V and 1.8 V) Figure 26. Input Offset Voltage Temperature Drift Distribution (−40°C < TA < +85°C), VS = 1.8 V Rev. 0 | Page 10 of 16 06323-025 –4 –5 0 06323-024 20 06323-023 10 AD8502/AD8504 1000 800 600 700 650 400 VOS (µV) ISY (nA) 06323-026 200 0 –200 –400 600 550 –600 –800 –1000 0 0.3 0.6 0.9 VCM (V) 1.2 1.5 1.8 0 0.3 0.6 0.9 VCM (V) 1.2 1.5 1.8 Figure 27. Input Offset Voltage vs. Input Common-Mode Voltage, VS = 1.8 V 1000 Figure 30. Supply Current vs. Input Common-Mode Voltage, VS = 1.8 V 1000 OUTPUT SATURATION VOLTAGE (mV) IB (+125°C) 100 IB (+85°C) 100 SOURCE 10 10 IB (pA) 1 IB (+25°C) 1 SINK 0.1 0.01 IB (–40°C) 06323-027 0.1 0 0.3 0.6 0.9 VCM (V) 1.2 1.5 1.8 0.01 0.1 1 LOAD CURRENT (mA) Figure 28. Input Bias Current vs. Input Common-Mode Voltage, VS = 1.8 V Figure 31. Output Saturation Voltage vs. Load Current VS = 1.8 V 70 60 100 OUTPUT SATURATION VOLTAGE (mV) NUMBER OF AMPLIFIERS VOH @ 10kΩ LOAD 10 VOL @ 10kΩ LOAD VOH @ 100kΩ LOAD 1 VOL @ 100kΩ LOAD 50 40 30 20 10 0 0.4 06323-028 0.5 0.6 ISY (µA) 0.7 0.8 0.9 –15 10 35 60 85 TEMPERATURE (°C) Figure 29. Supply Current Distribution, VS = 1.8 V Figure 32. Output Saturation Voltage vs. Temperature, VS = 1.8 V Rev. 0 | Page 11 of 16 06323-031 0.1 –40 06323-030 0.001 0.01 0.001 06323-029 500 AD8502/AD8504 80 60 40 20 0 –20 –40 –60 –80 10 120 90 35 30 PHASE MARGIN (Degrees) OPEN-LOOP GAIN (dB) 60 30 0 –30 –60 –90 –120 100k OS– 25 OVERSHOOT (%) 20 OS+ 15 10 5 0 10 100 1k FREQUENCY (Hz) 10k 06323-032 100 LOAD CAPACITANCE (pF) 1000 Figure 33. Open-Loop Gain and Phase vs. Frequency, VS = 1.8 V 100 90 80 Figure 35. Small Signal Overshoot vs. Load Capacitance, VS = 1.8 V 0.20 0.15 0.10 70 CMRR (dB) 50 40 30 VOUT (mV) 60 0.05 0 –0.05 –0.10 20 10 0 0.01 0.1 FREQUENCY (kHz) 1 10 06323-033 –0.15 –0.20 –0.5 0 0.5 TIME (ms) 1.0 1.5 Figure 34. CMRR vs. Frequency, VS = 1.8 V Figure 36. Small Signal Transient Response (No Load), VS = 1.8 V Rev. 0 | Page 12 of 16 06323-035 06323-034 AD8502/AD8504 0.20 0.15 CHANNEL SEPARATION (dB) 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 06323-036 1V p-p – + VIN 10kΩ A 1MΩ – 10kΩ + 10kΩ 0.10 0.05 0 –0.05 –0.10 –0.15 –0.20 –0.5 VOUT (mV) B, C, AND D OUT C OUT B OUT D 06323-039 0 0.5 TIME (ms) 1.0 1.5 –120 60 100 200 500 1k 2k 5k 10k 20k FREQUENCY (Hz) Figure 37. Small Signal Transient Response (100 pF Load Capacitance), VS = 1.8 V 2.0 1.8 1.6 1.4 VOUT (mV) Figure 39. Channel Separation 1.2 1.0 0.8 0.6 0.4 0.2 –1 0 1 2 3 TIME (ms) 4 5 6 7 8 06323-037 0 –2 Figure 38. Large Signal Transient Response (No Load), VS = 1.8 V Rev. 0 | Page 13 of 16 AD8502/AD8504 OUTLINE DIMENSIONS 2.90 BSC 5.10 5.00 4.90 5 8 7 6 1.60 BSC 1 2 3 4 2.80 BSC 14 8 PIN 1 INDICATOR 0.65 BSC 1.30 1.15 0.90 1.95 BSC 4.50 4.40 4.30 1 7 6.40 BSC PIN 1 1.05 1.00 0.80 0.65 BSC 1.20 MAX 0.15 0.05 0.30 0.19 1.45 MAX 0.38 0.22 0.22 0.08 8° 4° 0° 0.15 MAX SEATING PLANE 0.60 0.45 0.30 0.20 0.09 SEATING COPLANARITY PLANE 0.10 8° 0° 0.75 0.60 0.45 COMPLIANT TO JEDEC STANDARDS MO-178-BA COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 Figure 40. 8-Lead Small Outline Transistor Package [SOT-23] (RJ-8) Dimensions shown in millimeters Figure 41. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters ORDERING GUIDE Model AD8502ARJZ-R2 1 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 Package Option RJ-8 RJ-8 RJ-8 RU-14 RU-14 Branding A1D A1D A1D Z = Pb-free part. Rev. 0 | Page 14 of 16 AD8502/AD8504 NOTES Rev. 0 | Page 15 of 16 AD8502/AD8504 NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06323-0-1/07(0) Rev. 0 | Page 16 of 16