Single-Supply, Low Cost Instrumentation Amplifier AD8223 FEATURES CONNECTION DIAGRAM Gain set with 1 resistor R 1 8 +R G G Gain = 5 to 1000 IN 2 7 +V S Inputs +IN 3 6 OUT + Voltage range to 150 mV below negative rail V 4 5 REF S 25 nA maximum input bias current AD8223 30 nV/Hz, RTI noise 1 kHz Figure 1. 8-Lead SOIC (R) and 8-Lead MSOP (RM) Packages Power supplies Dual supply: 2 V to 12 V Table 1. Instrumentation Amplifiers by Category Single supply: 3 V to 24 V General- Mil Low High Voltage Purpose Zero Drift Grade Power PGA 500 A maximum supply current 1 1 1 AD8220 AD8231 AD620 AD627 AD8250 APPLICATIONS 1 1 AD8221 AD8553 AD621 AD623 AD8251 1 AD8222 AD8555 AD524 AD8223 AD8253 Low power medical instrumentation 1 1 AD8224 AD8556 AD526 Transducer interface 1 AD8228 AD8557 AD624 Thermocouple amplifiers Industrial process controls 1 Rail-to-rail output. Difference amplifiers Low power data acquisition GENERAL DESCRIPTION to operate from a single supply, the AD8223 still provides The AD8223 is an integrated single-supply instrumentation excellent performance when operated from a dual voltage amplifier that delivers rail-to-rail output swing on a single supply (2 V to 12 V). supply (3 V to 24 V). The AD8223 conforms to the 8-lead industry standard pinout configuration. Low power consumption (1.5 mW at 3 V), wide supply voltage range, and rail-to-rail output swing make the AD8223 ideal for The AD8223 is simple to use: one resistor sets the gain. With no battery-powered applications. The rail-to-rail output stage external resistor, the AD8223 is configured for G = 5. With an maximizes the dynamic range when operating from low supply external resistor, the AD8223 can be programmed for gains up voltages. The AD8223 replaces discrete instrumentation to 1000. amplifier designs and offers superior linearity, temperature The AD8223 has a wide input common-mode range and can stability, and reliability in a minimum of space. amplify signals that have a 150 mV common-mode voltage below ground. Although the design of the AD8223 is optimized 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 2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 06925-001AD8223 TABLE OF CONTENTS Features .............................................................................................. 1 Gain Selection ............................................................................. 14 Applications ....................................................................................... 1 Input Voltage Range ................................................................... 14 Connection Diagram ....................................................................... 1 Reference Terminal .................................................................... 15 General Description ......................................................................... 1 Input Protection ......................................................................... 15 Revision History ............................................................................... 2 RF Interference (RFI) ................................................................. 15 Specif icat ions ..................................................................................... 3 Ground Returns for Input Bias Currents ................................ 16 Single Supply ................................................................................. 3 Applications Information .............................................................. 17 Dual Supply ................................................................................... 5 Basic Connection ....................................................................... 17 Absolute Maximum Ratings ............................................................ 7 Differential Output .................................................................... 17 Thermal Resistance ...................................................................... 7 Output Buffering ........................................................................ 17 ESD Caution .................................................................................. 7 Cables ........................................................................................... 17 Pin Configuration and Function Descriptions ............................. 8 A Single-Supply Data Acquisition System .............................. 18 Typical Performance Characteristics ............................................. 9 Amplifying Signals with Low Common-Mode Voltage ........ 18 Theory of Operation ...................................................................... 14 Outline Dimensions ....................................................................... 19 Amplifier Architecture .............................................................. 14 Ordering Guide .......................................................................... 20 REVISION HISTORY 10/08Revision 0: Initial Version Rev. 0 Page 2 of 20