JFET Input Instrumentation Amplifier with Rail-to-Rail Output in MSOP Package Data Sheet AD8220 FEATURES PIN CONFIGURATION Low input currents AD8220 IN 1 8 +V S 10 pA maximum input bias current (B grade) R 2 7 V G OUT 0.6 pA maximum input offset current (B grade) R 3 6 REF G High CMRR +IN 4 5 V S 100 dB CMRR (minimum), G = 10 (B grade) 80 dB CMRR (minimum) to 5 kHz, G = 1 (B grade) TOP VIEW (Not to Scale) Excellent ac specifications and low power Figure 1. 1.5 MHz bandwidth (G = 1) 14 nV/Hz input noise (1 kHz) Slew rate: 2 V/s 750 A quiescent supply current (maximum) 10n Versatile MSOP package 1n Rail-to-rail output I BIAS Input voltage range to below negative supply rail 100p 4 kV ESD protection 4.5 V to 36 V single supply 10p 2.25 V to 18 V dual supply I OS 1p Gain set with single resistor (G = 1 to 1000) Qualified for automotive applications 0.1p APPLICATIONS 50 25 0 25 50 75 100 125 150 Medical instrumentation TEMPERATURE (C) Precision data acquisition Figure 2. Input Bias Current and Offset Current vs. Temperature Transducer interfaces GENERAL DESCRIPTION Gain is set from 1 to 1000 with a single resistor. Increasing the The AD8220 is the first single-supply, JFET input instrumentation amplifier available in an MSOP package. Designed to meet the gain increases the common-mode rejection. Measurements that needs of high performance, portable instrumentation, the AD8220 need higher CMRR when reading small signals benefit when has a minimum common-mode rejection ratio (CMRR) of 86 dB the AD8220 is set for large gains. at dc and a minimum CMRR of 80 dB at 5 kHz for G = 1. Maxi- A reference pin allows the user to offset the output voltage. This mum input bias current is 10 pA and typically remains below feature is useful when interfacing with analog-to-digital converters. 300 pA over the entire industrial temperature range. Despite The AD8220 is available in an MSOP that takes roughly half the the JFET inputs, the AD8220 typically has a noise corner of only board area of an SOIC. Performance for the A and B grade is 10 Hz. specified over the industrial temperature range of 40C to +85C, With the proliferation of mixed-signal processing, the number and the W grade is specified over the automotive temperature of power supplies required in each system has grown. The AD8220 range of 40C to +125C. is designed to alleviate this problem. The AD8220 can operate on a 18 V dual supply, as well as on a single +5 V supply. Its rail- to-rail output stage maximizes dynamic range on the low voltage supplies common in portable applications. Its ability to run on a single 5 V supply eliminates the need to use higher voltage, dual supplies. The AD8220 draws a maximum of 750 A of quiescent current, making it ideal for battery powered devices. Rev. C Document Feedback 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 20062019 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. INPUT BIAS CURRENT (A) 03579-005 03 57 9-05 9AD8220 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Power Supply Regulation and Bypassing ................................ 21 Applications ....................................................................................... 1 Input Bias Current Return Path ............................................... 21 Pin Configuration ............................................................................. 1 Input Protection ......................................................................... 21 General Description ......................................................................... 1 RF Interference ........................................................................... 22 Revision History ............................................................................... 2 Common-Mode Input Voltage Range ..................................... 22 Specifications ..................................................................................... 3 Driving an ADC ......................................................................... 22 Absolute Maximum Ratings ............................................................ 8 Applications Information .............................................................. 23 ESD Caution .................................................................................. 8 AC-Coupled Instrumentation Amplifier ................................ 23 Pin Configuration and Function Descriptions ............................. 9 Differential Output .................................................................... 23 Typical Performance Characteristics ........................................... 10 Electrocardiogram Signal Conditioning ................................. 25 Theory of Operation ...................................................................... 19 Outline Dimensions ....................................................................... 26 Gain Selection ............................................................................. 20 Ordering Guide .......................................................................... 26 Layout ........................................................................................... 20 Automotive Products ................................................................. 26 Reference Terminal .................................................................... 21 REVISION HISTORY 9/2019Rev. B to Rev. C 5/2007Rev. 0 to Rev. A Changes to Power Supply Parameter, Table 1 ............................... 5 Changes to Table 1 ............................................................................. 3 Changes to Ordering Guide .......................................................... 26 Changes to Table 2 ............................................................................. 5 Changes to Table 3 ............................................................................. 8 5/2010Rev. A to Rev. B Changes to Figure 6 and Figure 7 ................................................. 10 Added W Grade .................................................................. Universal Changes to Figure 23 and Figure 24 ............................................ 13 Changes to Features Section and General Description Section . 1 Changes to Theory of Operation .................................................. 19 Changes to Specifications Section and Table 1 ............................. 3 Changes to Layout .......................................................................... 20 Changes to Table 2 ............................................................................ 5 Changes to Ordering Guide .......................................................... 26 Updated Outline Dimensions ....................................................... 26 Changes to Ordering Guide .......................................................... 26 4/2006Revision 0: Initial Version Added Automotive Products Section........................................... 26 Rev. C Page 2 of 28