Single-Supply, Rail-to-Rail, Low Power, FET Input Op Amp AD820 FEATURES PIN CONFIGURATIONS True single-supply operation 1 8 NULL NC AD820 Output swings rail-to-rail IN 2 7 +V S Input voltage range extends below ground +IN 3 6 V OUT Single-supply capability from 5 V to 30 V TOP VIEW V 4 5 NULL Dual-supply capability from 2.5 V to 15 V S (Not to Scale) Excellent load drive NC = NO CONNECT Capacitive load drive up to 350 pF Figure 1. 8-Lead PDIP Minimum output current of 15 mA Excellent ac performance for low power 1 8 NC NC AD820 800 A maximum quiescent current IN 2 7 +V S Unity-gain bandwidth: 1.8 MHz +IN 3 6 V OUT Slew rate of 3 V/s TOP VIEW V 4 5 NC Excellent dc performance S (Not to Scale) 800 V maximum input offset voltage NC = NO CONNECT 2 V/C typical offset voltage drift Figure 2. 8-Lead SOIC N and 8-Lead MSOP 25 pA maximum input bias current Low noise: 13 nV/Hz 10 kHz APPLICATIONS Battery-powered precision instrumentation Photodiode preamps Active filters 12-bit to 14-bit data acquisition systems Medical instrumentation Low power references and regulators GENERAL DESCRIPTION The AD820 is a precision, low power FET input op amp that The AD820 is available in two performance grades. The A and can operate from a single supply of 5 V to 36 V, or dual supplies B grades are rated over the industrial temperature range of of 2.5 V to 18 V. It has true single-supply capability, with an 40C to +85C. The AD820 is offered in three 8-lead package input voltage range extending below the negative rail, allowing options: plastic DIP (PDIP), surface mount (SOIC) and (MSOP). the AD820 to accommodate input signals below ground in the single-supply mode. Output voltage swing extends to within 20s 1V 1V 10 mV of each rail, providing the maximum output dynamic range. 100 90 Offset voltage of 800 V maximum, offset voltage drift of 2 V/C, typical input bias currents below 25 pA, and low input voltage noise provide dc precision with source impedances up to 1 G. 1.8 MHz unity gain bandwidth, 93 dB THD at 10 kHz, and 3 V/s slew rate are provided for a low supply current of 800 A. The AD820 drives up to 350 pF of direct 10 capacitive load and provides a minimum output current of 0% 15 mA. This allows the amplifier to handle a wide range of load 1V conditions. This combination of ac and dc performance, plus the outstanding load drive capability, results in an exceptionally Figure 3. Gain-of-2 Amplifier V = 5 V, 0 V, V = 2.5 V Sine Centered at 1.25 V versatile amplifier for the single-supply user. S IN Rev. H 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. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 19962011 Analog Devices, Inc. All rights reserved. 00873-002 00873-001 00873-004AD820 TABLE OF CONTENTS Features .............................................................................................. 1 Applications Information .............................................................. 16 Applications ....................................................................................... 1 Input Characteristics .................................................................. 16 Pin Configurations ........................................................................... 1 Output Characteristics............................................................... 17 General Description ......................................................................... 1 Single-Supply Half-Wave and Full-Wave Rectifiers .............. 17 Revision History ............................................................................... 2 4.5 V Low Dropout, Low Power Reference ............................. 18 Specifications ..................................................................................... 3 Low Power, 3-Pole, Sallen Key Low-Pass Filter ...................... 18 Absolute Maximum Ratings ............................................................ 9 Offset Voltage Adjustment ............................................................ 19 Thermal Resistance ...................................................................... 9 Outline Dimensions ....................................................................... 20 ESD Caution .................................................................................. 9 Ordering Guide .......................................................................... 21 Typical Performance Characteristics ........................................... 10 REVISION HISTORY 3/11Rev. G to Rev. H Added Table 5 Renumbered Sequentially ..................................... 9 Changes to Figure 43 ...................................................................... 18 Changes to Figure 26 ...................................................................... 13 Changes to Figure 27 ...................................................................... 14 2/10Rev. F to Rev. G Changed Application Notes Section to Applications Changes to Features Section............................................................ 1 Information Section ....................................................................... 16 Changes to Open-Loop Gain Parameter ....................................... 3 Changes to Figure 40, Figure 41, and Figure 42 ......................... 17 Changes to Input Voltage Parameter ............................................. 9 Changes to Figure 44 ...................................................................... 18 Updated Outline Dimensions ....................................................... 20 Moved Offset Voltage Adjustment Section ................................. 19 Updated Outline Dimensions ....................................................... 20 11/08Rev. E to Rev. F Added Figure 49 Renumbered Sequentially .............................. 21 Added 8-Lead MSOP ......................................................... Universal Changes to Ordering Guide .......................................................... 21 Changes to Features Section, Figure 2 Caption, and General Description Section .......................................................................... 1 2/07Rev. D to Rev. E Changes to Settling Time Parameter, Common-Mode Voltage Updated Format .................................................................. Universal Range Parameter, and Power Supply Rejection Parameter in Updated Outline Dimensions ....................................................... 21 Table 1 ................................................................................................ 3 Changes to the Ordering Guide ................................................... 22 Changes to Settling Time Parameter, Common-Mode Voltage Range Parameter, and Power Supply Rejection Parameter in 5/02Rev. C to Rev. D Table 2 ................................................................................................ 5 Change to SOIC Package (R-8) Drawing .................................... 15 Changes to Settling Time Parameter, Common-Mode Voltage Edits to Features................................................................................. 1 Range Parameter, and Power Supply Rejection Parameter in Edits to Product Description ........................................................... 1 Table 3 ................................................................................................ 7 Delete Specifications for AD820A-3 V ........................................... 5 Edits to Ordering Guide ................................................................... 6 Changes to Table 4 ............................................................................ 9 Added Thermal Resistance Section ............................................... 9 Edits to Typical Performance Characteristics ................................ 8 Rev. 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