Dual/Quad Low Power, High Speed JFET Operational Amplifiers AD8682/AD8684 FEATURES PIN CONFIGURATIONS Low supply current: 250 A/amp maximum OUT A 1 8 V+ AD8682 High slew rate: 9 V/s IN A 2 7 OUT B TOP VIEW +IN A 3 6 IN B Bandwidth: 3.5 MHz typical (Not to Scale) V 4 5 +IN B Low offset voltage: 1 mV maximum 25C Low input bias current: 20 pA maximum 25C Figure 1. 8-Lead SOIC N and 8-Lead MSOP CMRR: 90 dB typical Fast settling time 14 OUT D Unity-gain stable OUT A 1 IN A 2 13 IN D APPLICATIONS +IN A 3 12 +IN D V+ 4 11 V AD8684 Portable telecommunications +IN B 5 10 +IN C Low power industrial and instrumentation IN B 6 9 IN C Loop filters OUT B 7 8 OUT C Active and precision filters TOP VIEW (Not to Scale) Integrators Figure 2. 14-Lead SOIC N and 14-Lead TSSOP Strain gauge amplifiers Portable medical instrumentation Supply current monitoring GENERAL DESCRIPTION The AD8682 and AD8684 are dual and quad low power, precision The devices are ideal for portable, low power applications, (1 mV) JFET amplifiers featuring excellent speed at low supply especially with high source impedance. The devices are unity-gain currents. The slew rate is typically 9 V/s with a supply current stable and can drive higher capacity loads (G = 1, noninverting), under 250 A per amplifier. These unity-gain stable amplifiers as an example of their excellent dynamic response over a wide have a typical gain bandwidth of 3.5 MHz. The JFET input stage range of conditions, delivering dc precision performance at low ensures bias current is typically a few picoamps and below quiescent currents. 125 pA maximum over the full temperature operating range. 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 20062008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 06278-002 06278-001AD8682/AD8684 TABLE OF CONTENTS Features .............................................................................................. 1 ESD Caution...................................................................................4 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................5 Pin Configurations ........................................................................... 1 Applications Information .............................................................. 10 General Description ......................................................................... 1 High-Side Signal Conditioning ................................................ 10 Revision History ............................................................................... 2 Phase Inversion ........................................................................... 10 Specif icat ions ..................................................................................... 3 Active Filters ............................................................................... 10 Electrical Characteristics ............................................................. 3 Programmable State Variable Filter ......................................... 11 Absolute Maximum Ratings ............................................................ 4 Outline Dimensions ....................................................................... 12 Thermal Resistance ...................................................................... 4 Ordering Guide .......................................................................... 14 REVISION HISTORY 7/08Rev. A to Rev. B Changes to Phase Inversion Section ............................................ 10 Deleted Figure 33 ............................................................................ 10 Added Figure 33 and Figure 34..................................................... 10 Updated Outline Dimensions ....................................................... 12 7/07Rev. 0 to Rev. A Change to Figure 21 ......................................................................... 8 Change to Figure 31 ......................................................................... 9 10/06Revision 0: Initial Version Rev. B Page 2 of 16