Low Gain Drift Precision Instrumentation Amplifier AD8228 FEATURES CONNECTION DIAGRAM Easy to use 1 8 IN +V S Pin strappable gains of 10 and 100 G1 2 7 V OUT Wide power supply range: 2.3 V to 18 V G2 3 6 REF DC specifications (B Grade, G = 10) +IN 4 5 V S AD8228 2 ppm/C gain drift TOP VIEW 0.02% gain error (Not to Scale) 50 V maximum input offset voltage Figure 1. 0.8 V/C maximum input offset drift 0.6 nA maximum input bias current 100 dB CMRR AC specifications 650 kHz, 3 dB bandwidth (G = 10) 2 V/s slew rate Low noise 8 nV/Hz, 1 kHz (G = 100) 0.3 V p-p from 0.1 Hz to 10 Hz (G = 100) Table 1. Instrumentation Amplifiers by Category APPLICATIONS General Zero Military Low High Speed Weigh scales Purpose Drift Grade Power PGA Industrial process controls 1 1 1 AD8220 AD8231 AD620 AD627 AD8250 Bridge amplifiers 1 1 AD8221 AD8553 AD621 AD623 AD8251 Precision data acquisition systems 1 AD8222 AD8555 AD524 AD8253 Medical instrumentation 1 1 AD8224 AD8556 AD526 Strain gages 1 AD8228 AD8557 AD624 Transducer interfaces 1 Rail-to-rail output. GENERAL DESCRIPTION The AD8228 operates on both single and dual supplies. Because The AD8228 is a high performance instrumentation amplifier the part can operate on supplies up to 18 V, it is well suited for with very high gain accuracy. Because all gain setting resistors applications where high common-mode input voltages are are internal and laser trimmed, gain accuracy and gain drift encountered. The AD8228 is available in 8-lead MSOP and are better than can be achieved with typical instrumentation SOIC packages. amplifiers. Performance is specified over the entire industrial temperature Low voltage offset, low offset drift, low gain drift, high gain range of 40C to +85C for all grades. Furthermore, the AD8228 accuracy, and high CMRR make this part an excellent choice is operational from 40C to +125C. For a pin-compatible ampli- in applications that demand the best dc performance possible, fier with similar specifications, but with a gain range of 1 to 1000, such as bridge signal conditioning. see the AD8221. 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. 07035-001AD8228 TABLE OF CONTENTS Features .............................................................................................. 1 Architecture ................................................................................ 16 Applications....................................................................................... 1 Setting the Gain .......................................................................... 16 General Description ......................................................................... 1 Common-Mode Input Voltage Range ..................................... 16 Connection Diagram ....................................................................... 1 Reference Terminal .................................................................... 17 Revision History ............................................................................... 2 Layout .......................................................................................... 17 Specifications..................................................................................... 3 Input Protection ......................................................................... 18 Gain = 10 ....................................................................................... 3 Radio Frequency Interference (RFI) ........................................ 18 Gain = 100 ..................................................................................... 5 Applications Information .............................................................. 19 Absolute Maximum Ratings............................................................ 7 Differential Drive ....................................................................... 19 Thermal Resistance ...................................................................... 7 Precision Strain Gage................................................................. 19 ESD Caution.................................................................................. 7 Driving a Differential ADC ...................................................... 19 Pin Configuration and Function Descriptions............................. 8 Outline Dimensions....................................................................... 20 Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 21 Theory of Operation ...................................................................... 16 REVISION HISTORY 7/08Revision 0: Initial Version Rev. 0 Page 2 of 24