ANALOG DEVICES AD8542

CMOS Rail-to-Rail General-Purpose Amplifiers AD8541/AD8542/AD8544 FEATURES PIN CONFIGURATIONS Single-supply operation: 2.7 V to 5.5 V Low supply current: 45 μA/amplifier AD8541 V+ OUT A 1 5 Wide bandwidth: 1 MHz No phase reversal V– 2 Low input currents: 4 pA +IN A 3 4 –IN A Unity gain stable Rail-to-rail input and output Figure 1. 5-Lead SC70 and 5-Lead SOT-23 (KS and RJ Suffixes) Qualified for automotive applications APPLICATIONS NC 1 8 NC ASIC input or output amplifiers AD8541 Sensor interfaces –IN A 2 7 V+ Piezoelectric transducer amplifiers +IN A 3 6 OUT A Medical instrumentation V– 4 5 NC Mobile communications NC = NO CONNECT Audio outputs Figure 2. 8-Lead SOIC Portable systems (R Suffix) GENERAL DESCRIPTION AD8542 OUT A 1 8 The AD8541/AD8542/AD8544 are single, dual, and quad rail- V+ to-rail input and output, single-supply amplifiers featuring very –IN A 2 7 OUT B low supply current and 1 MHz bandwidth. All are guaranteed to operate from a 2.7 V single supply as well as a 5 V supply. These +IN A 3 6 –IN B parts provide 1 MHz bandwidth at a low current consumption V– 4 5 +IN B of 45 μA per amplifier. Figure 3. 8-Lead SOIC, 8-Lead MSOP, and 8-Lead TSSOP Very low input bias currents enable the AD8541/AD8542/AD8544 (R, RM, and RU Suffixes) to be used for integrators, photodiode amplifiers, piezoelectric sensors, and other applications with high source impedance. The supply current is only 45 μA per amplifier, ideal for battery OUT A 1 14 OUT D operation. –IN A 2 13 –IN D Rail-to-rail inputs and outputs are useful to designers buffering ASICs in single-supply systems. The AD8541/AD8542/AD8544 3 12 +IN D +IN A are optimized to maintain high gains at lower supply voltages, AD8544 V+ 4 11 V– making them useful for active filters and gain stages. 5 10 +IN C +IN B The AD8541/AD8542/AD8544 are specified over the extended 6 9 industrial temperature range (–40°C to +125°C). The AD8541 –IN B –IN C is available in 5-lead SOT-23, 5-lead SC70, and 8-lead SOIC 7 8 OUT C OUT B packages. The AD8542 is available in 8-lead SOIC, 8-lead MSOP, and 8-lead TSSOP surface-mount packages. The AD8544 is Figure 4. 14-Lead SOIC and 14-Lead TSSOP (R and RU Suffixes) available in 14-lead narrow SOIC and 14-lead TSSOP surface- mount packages. All MSOP, SC70, and SOT versions are available in tape and reel only. See the Ordering Guide for automotive models. Rev. G 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 ©2008–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 00935-001 00935-002 00935-003 00935-004 AD8541/AD8542/AD8544 TABLE OF CONTENTS Features .............................................................................................. 1  Theory of Operation ...................................................................... 13  Applications....................................................................................... 1  Notes on the AD854x Amplifiers............................................. 13  General Description ......................................................................... 1  Applications..................................................................................... 14  Pin Configurations ........................................................................... 1  Notch Filter ................................................................................. 14  Revision History ............................................................................... 2  Comparator Function................................................................ 14  Specifications..................................................................................... 3  Photodiode Application ............................................................ 15  Electrical Characteristics............................................................. 3  Outline Dimensions....................................................................... 16  Absolute Maximum Ratings............................................................ 6  Ordering Guide .......................................................................... 19  Thermal Resistance ...................................................................... 6  Automotive Products................................................................. 19  ESD Caution.................................................................................. 6  Typical Performance Characteristics ............................................. 7  REVISION HISTORY 6/11—Rev. F to Rev. G 1/07—Rev. D to Rev. E Changes to Features Section and General Description Updated Format..................................................................Universal Section................................................................................................ 1 Changes to Photodiode Application Section.............................. 14 Changes to Table 5............................................................................ 6 Changes to Ordering Guide .......................................................... 17 Updated Outline Dimensions ....................................................... 16 8/04—Rev. C to Rev. D Changes to Ordering Guide .......................................................... 19 Changes to Ordering Guide .............................................................5 Added Automotive Products Section .......................................... 19 Changes to Figure 3........................................................................ 10 1/08—Rev. E to Rev. F Updated Outline Dimensions....................................................... 12 Inserted Figure 21; Renumbered Sequentially.............................. 9 1/03—Rev. B to Rev. C Changes to Figure 22 Caption......................................................... 9 Updated Format..................................................................Universal Changes to Notch Filter Section, Figure 35, Figure 36, and Changes to General Description .....................................................1 Figure 37 .......................................................................................... 13 Changes to Ordering Guide .............................................................5 Updated Outline Dimensions ....................................................... 16 Changes to Outline Dimensions .................................................. 12 Rev. G | Page 2 of 20 AD8541/AD8542/AD8544 SPECIFICATIONS ELECTRICAL CHARACTERISTICS V = 2.7 V, V = 1.35 V, T = 25°C, unless otherwise noted. S CM A Table 1. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage V 1 6 mV OS −40°C ≤ TA ≤ +125°C 7 mV Input Bias Current IB 4 60 pA −40°C ≤ TA ≤ +85°C 100 pA −40°C ≤ T ≤ +125°C 1000 pA A Input Offset Current I 0.1 30 pA OS −40°C ≤ T ≤ +85°C 50 pA A −40°C ≤ TA ≤ +125°C 500 pA Input Voltage Range 0 2.7 V Common-Mode Rejection Ratio CMRR VCM = 0 V to 2.7 V 40 45 dB −40°C ≤ T ≤ +125°C 38 dB A Large Signal Voltage Gain A R = 100 kΩ, V = 0.5 V to 2.2 V 100 500 V/mV VO L O −40°C ≤ T ≤ +85°C 50 V/mV A −40°C ≤ TA ≤ +125°C 2 V/mV Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 4 μV/°C Bias Current Drift ΔI /ΔT −40°C ≤ T ≤ +85°C 100 fA/°C B A −40°C ≤ T ≤ +125°C 2000 fA/°C A Offset Current Drift ΔI /ΔT −40°C ≤ T ≤ +125°C 25 fA/°C OS A OUTPUT CHARACTERISTICS Output Voltage High VOH IL = 1 mA 2.575 2.65 V −40°C ≤ TA ≤ +125°C 2.550 V Output Voltage Low VOL IL = 1 mA 35 100 mV −40°C ≤ T ≤ +125°C 125 mV A Output Current I V = V − 1 V 15 mA OUT OUT S I ±20 mA SC Closed-Loop Output Impedance ZOUT f = 200 kHz, AV = 1 50 Ω POWER SUPPLY Power Supply Rejection Ratio PSRR VS = 2.5 V to 6 V 65 76 dB −40°C ≤ T ≤ +125°C 60 dB A Supply Current/Amplifier I V = 0 V 38 55 μA SY O −40°C ≤ TA ≤ +125°C 75 μA DYNAMIC PERFORMANCE Slew Rate SR R = 100 kΩ 0.4 0.75 V/μs L Settling Time tS To 0.1% (1 V step) 5 μs Gain Bandwidth Product GBP 980 kHz Phase Margin 63 Degrees Φ M NOISE PERFORMANCE Voltage Noise Density e f = 1 kHz 40 nV/√Hz n en f = 10 kHz 38 nV/√Hz Current Noise Density in <0.1 pA/√Hz Rev. G | Page 3 of 20 AD8541/AD8542/AD8544 V = 3.0 V, V = 1.5 V, T = 25°C, unless otherwise noted. S CM A Table 2. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage V 1 6 mV OS −40°C ≤ T ≤ +125°C 7 mV A Input Bias Current I 4 60 pA B −40°C ≤ TA ≤ +85°C 100 pA −40°C ≤ TA ≤ +125°C 1000 pA Input Offset Current IOS 0.1 30 pA −40°C ≤ T ≤ +85°C 50 pA A −40°C ≤ T ≤ +125°C 500 pA A Input Voltage Range 0 3 V Common-Mode Rejection Ratio CMRR VCM = 0 V to 3 V 40 45 dB −40°C ≤ TA ≤ +125°C 38 dB Large Signal Voltage Gain AVO RL = 100 kΩ, VO = 0.5 V to 2.2 V 100 500 V/mV −40°C ≤ T ≤ +85°C 50 V/mV A −40°C ≤ T ≤ +125°C 2 V/mV A Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 4 μV/°C Bias Current Drift ΔIB/ΔT −40°C ≤ TA ≤ +85°C 100 fA/°C −40°C ≤ TA ≤ +125°C 2000 fA/°C Offset Current Drift ΔI /ΔT −40°C ≤ T ≤ +125°C 25 fA/°C OS A OUTPUT CHARACTERISTICS Output Voltage High VOH IL = 1 mA 2.875 2.955 V −40°C ≤ T ≤ +125°C 2.850 V A Output Voltage Low V I = 1 mA 32 100 mV OL L −40°C ≤ T ≤ +125°C 125 mV A Output Current IOUT VOUT = VS − 1 V 18 mA ISC ±25 mA Closed-Loop Output Impedance ZOUT f = 200 kHz, AV = 1 50 Ω POWER SUPPLY Power Supply Rejection Ratio PSRR VS = 2.5 V to 6 V 65 76 dB −40°C ≤ T ≤ +125°C 60 dB A Supply Current/Amplifier I V = 0 V 40 60 μA SY O −40°C ≤ T ≤ +125°C 75 μA A DYNAMIC PERFORMANCE Slew Rate SR R = 100 kΩ 0.4 0.8 V/μs L Settling Time t To 0.01% (1 V step) 5 μs S Gain Bandwidth Product GBP 980 kHz Phase Margin ΦM 64 Degrees NOISE PERFORMANCE Voltage Noise Density en f = 1 kHz 42 nV/√Hz en f = 10 kHz 38 nV/√Hz Current Noise Density in <0.1 pA/√Hz Rev. G | Page 4 of 20 AD8541/AD8542/AD8544 V = 5.0 V, V = 2.5 V, T = 25°C, unless otherwise noted. S CM A Table 3. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage V 1 6 mV OS −40°C ≤ TA ≤ +125°C 7 mV Input Bias Current IB 4 60 pA −40°C ≤ TA ≤ +85°C 100 pA −40°C ≤ T ≤ +125°C 1000 pA A Input Offset Current I 0.1 30 pA OS −40°C ≤ T ≤ +85°C 50 pA A −40°C ≤ TA ≤ +125°C 500 pA Input Voltage Range 0 5 V Common-Mode Rejection Ratio CMRR VCM = 0 V to 5 V 40 48 dB −40°C ≤ T ≤ +125°C 38 dB A Large Signal Voltage Gain A R = 100 kΩ, V = 0.5 V to 2.2 V 20 40 V/mV VO L O −40°C ≤ T ≤ +85°C 10 V/mV A −40°C ≤ TA ≤ +125°C 2 V/mV Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 4 μV/°C Bias Current Drift ΔIB/ΔT −40°C ≤ TA ≤ +85°C 100 fA/°C −40°C ≤ T ≤ +125°C 2000 fA/°C A Offset Current Drift ΔI /ΔT −40°C ≤ T ≤ +125°C 25 fA/°C OS A OUTPUT CHARACTERISTICS Output Voltage High VOH IL = 1 mA 4.9 4.965 V −40°C ≤ TA ≤ +125°C 4.875 V Output Voltage Low VOL IL = 1 mA 25 100 mV −40°C ≤ T ≤ +125°C 125 mV A Output Current I V = V − 1 V 30 mA OUT OUT S I ±60 mA SC Closed-Loop Output Impedance ZOUT f = 200 kHz, AV = 1 45 Ω POWER SUPPLY Power Supply Rejection Ratio PSRR V = 2.5 V to 6 V 65 76 dB S −40°C ≤ T ≤ +125°C 60 dB A Supply Current/Amplifier I V = 0 V 45 65 μA SY O −40°C ≤ TA ≤ +125°C 85 μA DYNAMIC PERFORMANCE Slew Rate SR R = 100 kΩ, C = 200 pF 0.45 0.92 V/μs L L Full Power Bandwidth BW 1% distortion 70 kHz P Settling Time t To 0.1% (1 V step) 6 μs S Gain Bandwidth Product GBP 1000 kHz Phase Margin ΦM 67 Degrees NOISE PERFORMANCE Voltage Noise Density e f = 1 kHz 42 nV/√Hz n e f = 10 kHz 38 nV/√Hz n Current Noise Density i <0.1 pA/√Hz n Rev. G | Page 5 of 20 AD8541/AD8542/AD8544 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 4. θ is specified for the worst-case conditions, that is, a device JA Parameter Rating soldered in a circuit board for surface-mount packages and Supply Voltage (V ) 6 V S measured using a standard 4-layer board, unless otherwise Input Voltage GND to V S specified. 1 Differential Input Voltage ±6 V Storage Temperature Range −65°C to +150°C Table 5. Operating Temperature Range −40°C to +125°C Package Type θJA θJC Unit Junction Temperature Range −65°C to +150°C 5-Lead SC70 (KS) 376 126 °C/W Lead Temperature (Soldering, 60 sec) 300°C 5-Lead SOT-23 (RJ) 190 92 °C/W 1 8-Lead SOIC (R) 120 45 °C/W For supplies less than 6 V, the differential input voltage is equal to ±V . S 8-Lead MSOP (RM) 142 45 °C/W Stresses above those listed under Absolute Maximum Ratings 8-Lead TSSOP (RU) 240 43 °C/W may cause permanent damage to the device. This is a stress 14-Lead SOIC (R) 115 36 °C/W rating only; functional operation of the device at these or any 14-Lead TSSOP (RU) 112 35 °C/W 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 ESD CAUTION device reliability. Rev. G | Page 6 of 20 AD8541/AD8542/AD8544 TYPICAL PERFORMANCE CHARACTERISTICS 180 400 V =5V S V = 2.7V AND 5V S V =2.5V 160 CM V = V /2 350 CM S T = 25°C A 140 300 120 250 100 200 80 150 60 100 40 50 20 0 0 –4.5 –3.5 –2.5 –1.5 –0.5 0.5 1.5 2.5 3.5 4.5 –40 –20 0 20 40 60 80 100 120 140 INPUT OFFSET VOLTAGE (mV) TEMPERATURE (°C) Figure 5. Input Offset Voltage Distribution Figure 8. Input Bias Current vs. Temperature 1.0 7 V = 2.7V AND 5V V = 2.7V AND 5V S S 0.5 V = V /2 V = V /2 CM S 6 CM S 0 5 –0.5 4 –1.0 –1.5 3 –2.0 2 –2.5 1 –3.0 0 –3.5 –4.0 –1 –55 –35 –15 5 254565 85 105 125 145 –55 –35 –15 5 25 45 65 85 105 125 145 TEMPERATURE (°C) TEMPERATURE (°C) Figure 6. Input Offset Voltage vs. Temperature Figure 9. Input Offset Current vs. Temperature 9 160 V = 2.7V AND 5V S V = 2.7V S 140 8 V = V /2 CM S T = 25°C A 120 7 100 6 80 5 –PSRR 60 4 +PSRR 40 3 20 2 0 1 –20 0 –40 –0.5 0.5 1.5 2.5 3.5 4.5 5.5 100 1k 10k 100k 1M 10M COMMON-MODE VOLTAGE (V) FREQUENCY (Hz) Figure 7. Input Bias Current vs. Common-Mode Voltage Figure 10. Power Supply Rejection vs. Frequency Rev. G | Page 7 of 20 INPUT OFFSET VOLTAGE (mV) NUMBER OF AMPLIFIERS INPUT BIAS CURRENT (pA) 00935-007 00935-005 00935-006 POWER SUPPLY REJECTION (dB) INPUT BIAS CURRENT (pA) INPUT OFFSET CURRENT (pA) 00935-009 00935-008 00935-010 AD8541/AD8542/AD8544 10k 60 V = 2.7V V = 2.7V S S R = 10kΩ T = 25°C L A T = 25°C 1k 50 A +OS 100 40 SOURCE –OS 10 30 SINK 20 1 0.1 10 0.01 0 0.001 0.01 0.1 1 10 100 10 100 1k 10k LOAD CURRENT (mA) CAPACITANCE (pF) Figure 11. Output Voltage to Supply Rail vs. Load Current Figure 14. Small Signal Overshoot vs. Load Capacitance 3.0 60 V = 2.7V S V = 2.7V S V = 2.5V p-p IN R = 2kΩ L R = 2kΩ 2.5 L 50 T = 25°C A T = 25°C A 2.0 40 +OS 1.5 30 –OS 1.0 20 0.5 10 0 0 1k 10k 100k 1M 10M 10 100 1k 10k FREQUENCY (Hz) CAPACITANCE (pF) Figure 12. Closed-Loop Output Voltage Swing vs. Frequency Figure 15. Small Signal Overshoot vs. Load Capacitance 60 V = 2.7V S R = L ∞ 50 T = 25°C V = 2.7V A S R = 100kΩ L C = 300pF L +OS A = 1 40 V T = 25°C A 30 –OS 1.35V 20 10 0 10 100 1k 10k 50mV 10µs CAPACITANCE (pF) Figure 13. Small Signal Overshoot vs. Load Capacitance Figure 16. Small Signal Transient Response Rev. G | Page 8 of 20 ∆ OUTPUT VOLTAGE (mV) OUTPUT SWING (V p-p) SMALL SIGNAL OVERSHOOT (%) 00935-013 00935-012 00935-011 SMALL SIGNAL OVERSHOOT (%) SMALL SIGNAL OVERSHOOT (%) 00935-016 00935-015 00935-014 AD8541/AD8542/AD8544 90 V = 2.7V S V = 5V S R = 2kΩ L 80 T = 25°C A A = 1 V T = 25°C 70 A 60 50 1.35V 40 30 20 10 0 500mV 10µs –10 1k 10k 100k 1M 10M FREQUENCY (Hz) Figure 17. Large Signal Transient Response Figure 20. Common-Mode Rejection vs. Frequency 5 V = 2.7V S V =5V S R = NO LOAD 4 L R = NO LOAD L T = 25°C T =25°C A A 3 80 2 60 45 1 90 40 0 20 135 –1 180 0 –2 –3 –4 –5 1k 10k 100k 1M 10M 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 FREQUENCY (Hz) COMMON-MODE VOLTAGE (V) Figure 18. Open-Loop Gain and Phase vs. Frequency Figure 21. Input Offset Voltage vs. Common-Mode Voltage 160 10k V = 5V V = 5V S S 140 T = 25°C T = 25°C A A 1k 120 100 100 80 –PSRR SOURCE 60 10 +PSRR 40 SINK 1 20 0 0.1 –20 –40 0.01 100 1k 10k 100k 1M 10M 0.001 0.01 0.1 1 10 100 FREQUENCY (Hz) LOAD CURRENT (mA) Figure 19. Power Supply Rejection Ratio vs. Frequency Figure 22. Output Voltage to Supply Rail vs. Load Current Rev. G | Page 9 of 20 GAIN (dB) POWER SUPPLY REJECTION RATIO (dB) 00935-017 PHASE SHIFT (Degrees) 00935-019 00935-018 COMMON-MODE REJECTION (dB) ∆ OUTPUT VOLTAGE (mV) INPUT OFFSET VOLTAGE (mV) 00935-040 00935-021 00935-020 AD8541/AD8542/AD8544 5.0 60 V = 5V V = 5V S S 4.5 V = 4.9V p-p R = 2kΩ IN L R = NO LOAD 50 T = 25°C L A 4.0 T = 25°C A 3.5 40 3.0 +OS 2.5 30 2.0 –OS 20 1.5 1.0 10 0.5 0 0 1k 10k 100k 1M 10M 10 100 1k 10k FREQUENCY (Hz) CAPACITANCE (pF) Figure 23. Closed-Loop Output Voltage Swing vs. Frequency, Figure 26. Small Signal Overshoot vs. Load Capacitance 5.0 60 V = 5V S V = 5V S 4.5 V = 4.9V p-p IN R = L ∞ R = 2kΩ L 50 T = 25°C A 4.0 T = 25°C A 3.5 40 3.0 +OS 2.5 30 –OS 2.0 20 1.5 1.0 10 0.5 0 0 1k 10k 100k 1M 10M 10 100 1k 10k FREQUENCY (Hz) CAPACITANCE (pF) Figure 24. Closed-Loop Output Voltage Swing vs. Frequency Figure 27. Small Signal Overshoot vs. Load Capacitance 60 V = 5V V = 5V S S R = 100kΩ R = 10kΩ L L C = 300pF T = 25°C 50 L A A = 1 V T = 25°C A 40 +OS 2.5V 30 –OS 20 10 50mV 10µs 0 10 100 1k 10k CAPACITANCE (pF) Figure 25. Small Signal Overshoot vs. Load Capacitance Figure 28. Small Signal Transient Response Rev. G | Page 10 of 20 OUTPUT SWING (V p-p) OUTPUT SWING (V p-p) SMALL SIGNAL OVERSHOOT (%) 00935-024 00935-023 00935-022 SMALL SIGNAL OVERSHOOT (%) SMALL SIGNAL OVERSHOOT (%) 00935-027 00935-026 00935-025 AD8541/AD8542/AD8544 V = 5V V = 5V S S R = 10kΩ R = 2kΩ L L V IN A = 1 A = 1 V V T = 25°C T = 25°C A A V OUT 2.5V 2.5V 1V 10µs 1V 20µs Figure 29. Large Signal Transient Response Figure 31. No Phase Reversal 60 V = 5V S T = 25°C A R = NO LOAD L T = 25°C A 50 80 40 60 45 40 90 30 20 135 20 0 180 10 0 1k 10k 100k 1M 10M 012 3 4 5 6 FREQUENCY (Hz) SUPPLY VOLTAGE (V) Figure 30. Open-Loop Gain and Phase vs. Frequency Figure 32. Supply Current per Amplifier vs. Supply Voltage Rev. G | Page 11 of 20 GAIN (dB) 00935-028 PHASE SHIFT (Degrees) 00935-029 SUPPLY CURRENT/AMPLIFIER (µA) 00935-030 00935-031 AD8541/AD8542/AD8544 55 V =5V S MARKER SET @ 10kHz 50 MARKER READING: 37.6nV/ Hz T =25°C V = 5V S A 45 40 V = 2.7V S 35 30 25 20 0 5 10 15 20 25 –55 –35 –15 5 25 45 65 85 105 125 145 FREQUENCY (kHz) TEMPERATURE (°C) Figure 35. Voltage Noise Figure 33. Supply Current per Amplifier vs. Temperature 1000 V = 2.7V AND 5V S 900 A =1 V T = 25°C A 800 700 600 500 400 300 200 100 0 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) Figure 34. Closed-Loop Output Impedance vs. Frequency Rev. G | Page 12 of 20 IMPEDANCE (Ω) SUPPLY CURRENT/AMPLIFIER (µA) 00935-032 00935-033 15nV/DIV 00935-034 AD8541/AD8542/AD8544 THEORY OF OPERATION Higher Output Current NOTES ON THE AD854X AMPLIFIERS At 5 V single supply, the short-circuit current is typically 60 μA. The AD8541/AD8542/AD8544 amplifiers are improved Even 1 V from the supply rail, the AD854x amplifiers can provide a performance, general-purpose operational amplifiers. 30 mA output current, sourcing, or sinking. Performance has been improved over previous amplifiers in several ways, including lower supply current for 1 MHz gain Sourcing and sinking are strong at lower voltages, with 15 mA bandwidth, higher output current, and better performance at available at 2.7 V and 18 mA at 3.0 V. For even higher output lower voltages. currents, see the AD8531/AD8532/AD8534 parts for output currents to 250 mA. Information on these parts is available Lower Supply Current for 1 MHz Gain Bandwidth from your Analog Devices, Inc. representative, and data sheets The AD854x series typically uses 45 μA of current per amplifier, are available at www.analog.com. which is much less than the 200 μA to 700 μA used in earlier Better Performance at Lower Voltages generation parts with similar performance. This makes the AD854x series a good choice for upgrading portable designs The AD854x family of parts was designed to provide better ac for longer battery life. Alternatively, additional functions and performance at 3.0 V and 2.7 V than previously available parts. performance can be added at the same current drain. Typical gain bandwidth product is close to 1 MHz at 2.7 V. Voltage gain at 2.7 V and 3.0 V is typically 500,000. Phase margin is typically over 60°C, making the part easy to use. Rev. G | Page 13 of 20 AD8541/AD8542/AD8544 APPLICATIONS Figure 38 is an example of the AD8544 in a notch filter circuit. The NOTCH FILTER frequency dependent negative resistance (FDNR) notch filter has The AD854x have very high open-loop gain (especially with a fewer critical matching requirements than the twin-T notch, where supply voltage below 4 V), which makes it useful for active filters of as the Q of the FDNR is directly proportional to a single resistor R1. all types. For example, Figure 36 illustrates the AD8542 in the Although matching component values is still important, it is also classic twin-T notch filter design. The twin-T notch is desired much easier and/or less expensive to accomplish in the FDNR for simplicity, low output impedance, and minimal use of op circuit. For example, the twin-T notch uses three capacitors amps. In fact, this notch filter can be designed with only one op with two unique values, whereas the FDNR circuit uses only amp if Q adjustment is not required. Simply remove U2 as two capacitors, which may be of the same value. U3 is simply a illustrated in Figure 37. However, a major drawback to this buffer that is added to lower the output impedance of the circuit. circuit topology is ensuring that all the Rs and Cs closely match. The components must closely match or notch frequency offset 1/4 AD8544 R1 9 Q ADJUST 8 and drift causes the circuit to no longer attenuate at the ideal U3 V 200Ω OUT 10 notch frequency. To achieve desired performance, 1% or better C1 V component tolerances or special component screens are usually IN 1µF required. One method to desensitize the circuit-to-component 2.5V REF R mismatch is to increase R2 with respect to R1, which lowers Q. 2.61kΩ A lower Q increases attenuation over a wider frequency range 4 3 1/4 AD8544 C2 1 1/4 AD8544 but reduces attenuation at the peak notch frequency. 1µF U1 2 6 11 7 U2 R 5 2.61kΩ 5.0V R R R 8 100kΩ 100kΩ 3 1/2 AD8542 2.61kΩ 1 f = V U1 OUT 2π LC1 V 2 IN 2C 1 1/4 AD8544 R 13 4 53.6µF 2 L = R C2 2.61kΩ 14 U4 NC 2.5V 12 REF R/2 2.5V REF 50kΩ V IN R2 2.5V REF C C 2.5kΩ 1/2 AD8542 26.7nF 26.7nF 5 Figure 38. FDNR 60 Hz Notch Filter with Output Buffer 1 7 f = 0 U2 6 2πRC COMPARATOR FUNCTION R1 1 f = 97.5kΩ 0 R1 A comparator function is a common application for a spare op 4 1 – R1 + R2 2.5V REF amp in a quad package. Figure 39 illustrates ¼ of the AD8544 as a comparator in a standard overload detection application. Unlike Figure 36. 60 Hz Twin-T Notch Filter, Q = 10 many op amps, the AD854x family can double as comparators because this op amp family has a rail-to-rail differential input 5.0V range, rail-to-rail output, and a great speed vs. power ratio. RR 7 3 AD8541 R2 is used to introduce hysteresis. The AD854x, when used as U1 V OUT 2 comparators, have 5 μs propagation delay at 5 V and 5 μs V 6 IN 4 2C overload recovery time. 2.5V REF R2 1MΩ R1 R/2 1kΩ V OUT V C C IN 1/4 AD8541 Figure 37. 60 Hz Twin-T Notch Filter, Q = ∞ (Ideal) 2.5V 2.5V DC REF Figure 39. AD854x Comparator Application—Overload Detector Rev. G | Page 14 of 20 00935-035 00935-036 00935-038 00935-037 AD8541/AD8542/AD8544 C PHOTODIODE APPLICATION 100pF The AD854x family has very high impedance with an input bias R current typically around 4 pA. This characteristic allows the 10MΩ AD854x op amps to be used in photodiode applications and V+ OR 7 other applications that require high input impedance. Note that 2 6 V the AD854x has significant voltage offset that can be removed OUT 3 AD8541 by capacitive coupling or software calibration. 4 D Figure 40 illustrates a photodiode or current measurement 2.5V 2.5V application. The feedback resistor is limited to 10 MΩ to avoid REF REF excessive output offset. In addition, a resistor is not needed on Figure 40. High Input Impedance Application—Photodiode Amplifier the noninverting input to cancel bias current offset because the bias current-related output offset is not significant when compared to the voltage offset contribution. For best performance, follow the standard high impedance layout techniques, which include the following: • Shielding the circuit. • Cleaning the circuit board. • Putting a trace connected to the noninverting input around the inverting input. • Using separate analog and digital power supplies. Rev. G | Page 15 of 20 00935-039 AD8541/AD8542/AD8544 OUTLINE DIMENSIONS 3.00 2.90 2.80 5 4 3.00 1.70 2.80 1.60 2.60 1.50 12 3 0.95 BSC 1.90 BSC 1.30 1.15 0.90 0.20 MAX 1.45 MAX 0.08 MIN 0.95 MIN 0.55 0.15 MAX 10° 0.45 SEATING 0.60 0.05 MIN 5° 0.50 MAX 0.35 PLANE BSC 0° 0.35 MIN COMPLIANT TO JEDEC STANDARDS MO-178-AA Figure 41. 5-Lead Small Outline Transistor Package [SOT-23] (RJ-5) Dimensions shown in millimeters 5.10 5.00 4.90 14 8 4.50 6.40 4.40 BSC 4.30 1 7 PIN 1 0.65 BSC 1.05 1.20 1.00 0.20 MAX 0.80 0.09 0.75 0.15 8° 0.60 SEATING 0° 0.05 0.45 0.30 PLANE COPLANARITY 0.19 0.10 COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 Figure 42. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters Rev. G | Page 16 of 20 061908-A 11-01-2010-A AD8541/AD8542/AD8544 2.20 2.00 1.80 1.35 5 4 2.40 1.25 2.10 1.15 12 3 1.80 0.65 BSC 1.00 0.40 1.10 0.90 0.10 0.80 0.70 0.46 0.22 SEATING 0.10 MAX 0.36 0.30 0.08 PLANE COPLANARITY 0.26 0.15 0.10 COMPLIANT TO JEDEC STANDARDS MO-203-AA Figure 43. 5-Lead Thin Shrink Small Outline Transistor Package [SC70] (KS-5) Dimensions shown in millimeters 8.75 (0.3445) 8.55 (0.3366) 8 14 6.20 (0.2441) 4.00 (0.1575) 1 5.80 (0.2283) 3.80 (0.1496) 7 1.27 (0.0500) 0.50 (0.0197) 45° BSC 0.25 (0.0098) 1.75 (0.0689) 0.25 (0.0098) 1.35 (0.0531) 8° 0.10 (0.0039) 0° COPLANARITY SEATING 1.27 (0.0500) 0.51 (0.0201) 0.10 PLANE 0.25 (0.0098) 0.40 (0.0157) 0.31 (0.0122) 0.17 (0.0067) COMPLIANT TO JEDEC STANDARDS MS-012-AB 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. Figure 44. 14-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-14) Dimensions shown in millimeters and (inches) Rev. G | Page 17 of 20 072809-A 060606-A AD8541/AD8542/AD8544 3.20 3.10 3.00 3.00 2.80 2.90 8 5 8 5 5.15 3.20 4.90 4.50 3.00 4.65 6.40 BSC 4.40 1 2.80 4 4.30 PIN 1 1 4 IDENTIFIER PIN 1 0.65 BSC 0.65 BSC 0.95 15° MAX 0.15 0.85 1.20 1.10 MAX 0.05 MAX 0.75 8° 0.80 0.75 0.30 0° 0.15 SEATING 0.23 COPLANARITY 6° 0.20 0.55 0.40 0.60 0.19 PLANE 0.10 0.05 0.09 0° 0.40 0.09 0.25 0.45 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-153-AA COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 45. 8-Lead Mini Small Outline Package [MSOP] Figure 46. 8-Lead Thin Shrink Small Outline Package [TSSOP] (RM-8) (RU-8) Dimensions shown in millimeters Dimensions shown in millimeters 5.00 (0.1968) 4.80 (0.1890) 85 6.20 (0.2441) 4.00 (0.1574) 1 5.80 (0.2284) 3.80 (0.1497) 4 1.27 (0.0500) 0.50 (0.0196) 45° BSC 1.75 (0.0688) 0.25 (0.0099) 1.35 (0.0532) 0.25 (0.0098) 8° 0.10 (0.0040) 0° COPLANARITY 0.51 (0.0201) 1.27 (0.0500) 0.10 0.31 (0.0122) 0.25 (0.0098) SEATING 0.40 (0.0157) 0.17 (0.0067) PLANE COMPLIANT TO JEDEC STANDARDS MS-012-AA 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. Figure 47. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) Rev. G | Page 18 of 20 10-07-2009-B 012407-A AD8541/AD8542/AD8544 ORDERING GUIDE 1, 2 Model Temperature Range Package Description Package Option Branding AD8541AKSZ-R2 –40°C to +125°C 5-Lead SC70 KS-5 A12 AD8541AKSZ-REEL7 –40°C to +125°C 5-Lead SC70 KS-5 A12 AD8541ARTZ-R2 –40°C to +125°C 5-Lead SOT-23 RJ-5 A4A AD8541ARTZ-REEL –40°C to +125°C 5-Lead SOT-23 RJ-5 A4A AD8541ARTZ-REEL7 –40°C to +125°C 5-Lead SOT-23 RJ-5 A4A AD8541ARZ –40°C to +125°C 8-Lead SOIC_N R-8 AD8541ARZ-REEL –40°C to +125°C 8-Lead SOIC_N R-8 AD8541ARZ-REEL7 –40°C to +125°C 8-Lead SOIC_N R-8 AD8542ARZ –40°C to +125°C 8-Lead SOIC_N R-8 AD8542ARZ-REEL –40°C to +125°C 8-Lead SOIC_N R-8 AD8542ARZ-REEL7 –40°C to +125°C 8-Lead SOIC_N R-8 AD8542ARM-REEL –40°C to +125°C 8-Lead MSOP RM-8 AVA AD8542ARMZ –40°C to +125°C 8-Lead MSOP RM-8 AVA AD8542ARMZ-REEL –40°C to +125°C 8-Lead MSOP RM-8 AVA AD8542ARU-REEL –40°C to +125°C 8-Lead TSSOP RU-8 AD8542ARUZ –40°C to +125°C 8-Lead TSSOP RU-8 AD8542ARUZ-REEL –40°C to +125°C 8-Lead TSSOP RU-8 AD8544ARZ –40°C to +125°C 14-Lead SOIC_N R-14 AD8544ARZ-REEL –40°C to +125°C 14-Lead SOIC_N R-14 AD8544ARZ-REEL7 –40°C to +125°C 14-Lead SOIC_N R-14 AD8544ARUZ –40°C to +125°C 14-Lead TSSOP RU-14 AD8544ARUZ-REEL –40°C to +125°C 14-Lead TSSOP RU-14 AD8544WARZ-RL –40°C to +125°C 14-Lead SOIC_N R-14 AD8544WARZ-R7 –40°C to +125°C 14-Lead SOIC_N R-14 1 Z = RoHS Compliant Part. 2 W = Qualified for Automotive Applications. AUTOMOTIVE PRODUCTS The AD8544W models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. Note that these automotive models may have specifications that differ from the commercial models; therefore, designers should review the Specifications section of this data sheet carefully. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models. Rev. G | Page 19 of 20 AD8541/AD8542/AD8544 NOTES ©2008–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00935-0-6/11(G) Rev. G | Page 20 of 20