Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier AD8227 FEATURES PIN CONFIGURATION Gain set with 1 external resistor AD8227 IN 1 8 +V S Gain range: 5 to 1000 R 2 7 V G OUT Input voltage goes below ground R 3 6 REF G Inputs protected beyond supplies +IN 4 5 V S Very wide power supply range Single supply: 2.2 V to 36 V TOP VIEW (Not to Scale) Dual supply: 1.5 V to 18 V Figure 1. Bandwidth (G = 5): 250 kHz CMRR (G = 5): 100 dB minimum (B Grade) Input noise: 24 nV/Hz 1 Table 1. Instrumentation Amplifiers by Category Typical supply current: 350 A General Zero Military Low High Speed Specified temperature: 40C to +125C Purpose Drift Grade Power PGA 8-lead SOIC and MSOP packages AD8220 AD8231 AD620 AD627 AD8250 APPLICATIONS AD8221 AD8290 AD621 AD623 AD8251 AD8222 AD8293 AD524 AD8223 AD8253 Industrial process controls AD8224 AD8553 AD526 AD8226 Bridge amplifiers Medical instrumentation AD8228 AD8556 AD624 AD8227 Portable data acquisition AD8295 AD8557 Multichannel systems 1 See www.analog.com for the latest selection of instrumentation amplifiers. GENERAL DESCRIPTION The AD8227 is ideal for multichannel, space-constrained The AD8227 is a low cost, wide supply range instrumentation applications. With its MSOP package and 125C temperature amplifier that requires only one external resistor to set any gain rating, the AD8227 thrives in tightly packed, zero airflow designs. between 5 and 1000. The AD8227 is available in 8-pin MSOP and SOIC packages. The AD8227 is designed to work with a variety of signal voltages. It is fully specified for 40C to +125C operation. A wide input range and rail-to-rail output allow the signal to make full use of the supply rails. Because the input range can For a similar instrumentation amplifier with a gain range of 1 to also go below the negative supply, small signals near ground can 1000, see the AD8226. be amplified without requiring dual supplies. The AD8227 operates on supplies ranging from 1.5 V to 18 V (2.2 V to 36 V single supply). The robust AD8227 inputs are designed to connect to real- world sensors. In addition to its wide operating range, the AD8227 can handle voltages beyond the rails. For example, with a 5 V supply, the part is guaranteed to withstand 35 V at the input with no damage. Minimum as well as maximum input bias currents are specified to facilitate open wire detection. Rev. 0 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 2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 07759-001AD8227 TABLE OF CONTENTS Features .............................................................................................. 1 Gain Selection ............................................................................. 19 Applications ....................................................................................... 1 Reference Terminal .................................................................... 20 Pin Configuration ............................................................................. 1 Input Voltage Range ................................................................... 20 General Description ......................................................................... 1 Layout .......................................................................................... 20 Revision History ............................................................................... 2 Input Bias Current Return Path ............................................... 21 Specif icat ions ..................................................................................... 3 Input Protection ......................................................................... 21 Absolute Maximum Ratings ............................................................ 7 Radio Frequency Interference (RFI) ........................................ 21 Thermal Resistance ...................................................................... 7 Applications Information .............................................................. 22 ESD Caution .................................................................................. 7 Differential Drive ....................................................................... 22 Pin Configuration and Function Descriptions ............................. 8 Precision Strain Gage ................................................................. 22 Typical Performance Characteristics ............................................. 9 Driving an ADC ......................................................................... 23 Theory of Operation ...................................................................... 19 Outline Dimensions ....................................................................... 24 Architec ture ................................................................................. 19 Ordering Guide .......................................................................... 24 REVISION HISTORY 5/09Revision 0: Initial Version Rev. 0 Page 2 of 24