AD8541

General-Purpose CMOS Rail-to-Rail Amplifiers AD8541/AD8542/AD8544 FEATURES Single-supply operation: 2.7 V to 5.5 V Low supply current: 45 μA/amplifier Wide bandwidth: 1 MHz No phase reversal Low input currents: 4 pA Unity gain stable Rail-to-rail input and output PIN CONFIGURATIONS OUT A 1 V– 2 +IN A 3 4 –IN A 00935-001 AD8541 5 V+ Figure 1. 5-Lead SC70 and 5-Lead SOT-23 (KS and RJ Suffixes) APPLICATIONS ASIC input or output amplifiers Sensor interfaces Piezoelectric transducer amplifiers Medical instrumentations Mobile communications Audio outputs Portable systems NC 1 –IN A 2 AD8541 8 7 6 5 NC V+ OUT A 00935-002 +IN A 3 V– 4 NC NC = NO CONNECT Figure 2. 8-Lead SOIC (R Suffix) GENERAL DESCRIPTION The AD8541/AD8542/AD8544 are single, dual, and quad railto-rail input and output single-supply amplifiers featuring very 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 parts provide 1 MHz bandwidth at a low current consumption of 45 μA per amplifier. Very low input bias currents enable the AD8541/AD8542/AD8544 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 operation. Rail-to-rail inputs and outputs are useful to designers buffering ASICs in single-supply systems. The AD8541/AD8542/AD8544 are optimized to maintain high gains at lower supply voltages, making them useful for active filters and gain stages. The AD8541/AD8542/AD8544 are specified over the extended industrial temperature range (–40°C to +125°C). The AD8541 is available in 8-lead SOIC, 5-lead SC70, and 5-lead SOT-23 packages. The AD8542 is available in 8-lead SOIC, 8-lead MSOP, and 8-lead TSSOP surface-mount packages. The AD8544 is 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. OUT A –IN A +IN A V– 1 2 3 4 AD8542 8 7 6 5 V+ OUT B –IN B +IN B 00935-003 00935-004 Figure 3. 8-Lead SOIC, 8-Lead MSOP, and 8-Lead TSSOP (R, RM, and RU Suffixes) OUT A –IN A +IN A V+ +IN B –IN B OUT B 1 2 3 4 5 6 7 14 OUT D 13 –IN D 12 +IN D AD8544 11 V– 10 +IN C 9 8 –IN C OUT C Figure 4. 14-Lead SOIC and 14-Lead TSSOP (R and RU Suffixes) Rev. E 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. AD8541/AD8542/AD8544 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Pin Configurations ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics............................................................. 3 Absolute Maximum Ratings............................................................ 6 Thermal Resistance ...................................................................... 6 ESD Caution.................................................................................. 6 Typical Performance Characteristics ..............................................7 Theory of Operation ...................................................................... 12 Notes on the AD854x Amplifiers............................................. 12 Applications..................................................................................... 13 Notch Filter ................................................................................. 13 Comparator Function ................................................................ 13 Photodiode Application ............................................................ 14 Outline Dimensions ....................................................................... 15 Ordering Guide .......................................................................... 17 REVISION HISTORY 1/07—Rev. D to Rev. E Updated Format..................................................................Universal Changes to Photodiode Application Section .............................. 14 Changes to Ordering Guide .......................................................... 17 8/04—Rev. C to Rev. D Changes to Ordering Guide ............................................................ 5 Changes to Figure 3........................................................................ 10 Updated Outline Dimensions ....................................................... 12 1/03—Rev. B to Rev. C Updated Format..................................................................Universal Changes to General Description .................................................... 1 Changes to Ordering Guide ............................................................ 5 Changes to Outline Dimensions................................................... 12 Rev. E | Page 2 of 20 AD8541/AD8542/AD8544 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VS = 2.7 V, VCM = 1.35 V, TA = 25°C, unless otherwise noted. Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol VOS –40°C ≤ TA ≤ +125°C IB –40°C ≤ TA ≤ +85°C –40°C ≤ TA ≤ +125°C Input Offset Current IOS –40°C ≤ TA ≤ +85°C –40°C ≤ TA ≤ +125°C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain CMRR AVO VCM = 0 V to 2.7 V –40°C ≤ TA ≤ +125°C RL = 100 kΩ , VO = 0.5 V to 2.2 V –40°C ≤ TA ≤ +85°C –40°C ≤ TA ≤ +125°C –40°C ≤ TA ≤ +125°C –40°C ≤ TA ≤ +85°C –40°C ≤ TA ≤ +125°C –40°C ≤ TA ≤ +125°C I L = 1 mA –40°C ≤ TA ≤ +125°C I L = 1 mA –40°C ≤ TA ≤ +125°C VOUT = VS – 1 V f = 200 kHz, AV = 1 VS = 2.5 V to 6 V –40°C ≤ TA ≤ +125°C VO = 0 V –40°C ≤ TA ≤ +125°C RL = 100 kΩ To 0.1% (1 V step) 65 60 0 40 38 100 50 2 45 500 0.1 4 Conditions Min Typ 1 Max 6 7 60 100 1000 30 50 500 2.7 Unit mV mV pA pA pA pA pA pA V dB dB V/mV V/mV V/mV μV/°C fA/°C fA/°C fA/°C V V mV mV mA mA Ω dB dB μA μA V/μs μs kHz Degrees nV/√Hz nV/√Hz pA/√Hz Offset Voltage Drift Bias Current Drift Offset Current Drift OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Density Current Noise Density ΔVOS/ΔT ΔIB/ΔT ΔIOS/ΔT VOH VOL IOUT ±ISC ZOUT PSRR ISY 4 100 2000 25 2.575 2.550 2.65 35 15 ±20 50 76 38 55 75 100 125 SR tS GBP Φo en en in 0.4 0.75 5 980 63 40 38