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AD8221AR Datasheet(PDF) 1 Page - Analog Devices |
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AD8221AR Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page Precision Instrumentation Amplifier AD8221 Rev. A 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 rights of third parties that may result from its use. Specifications subject to change without notice. No 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2003 Analog Devices, Inc. All rights reserved. FEATURES Available in space-saving MSOP package Gain set with 1 external resistor (gain range 1 to 1000) Wide power supply range: ±2.3 V to ±18 V Temperature range for specified performance: –40°C to +85°C Operational up to 125°C1 EXCELLENT AC SPECIFICATONS 80 dB min CMRR to 10 kHz ( G = 1) 825 kHz –3 dB bandwidth (G = 1) 2 V/µs slew rate LOW NOISE 8 nV/√Hz, @ 1 kHz, max input voltage noise 0.25 µV p-p input noise (0.1 Hz to 10 Hz) HIGH ACCURACY DC PERFORMANCE (AD8221BR) 90 dB min CMRR (G = 1) 25 µV max input offset voltage 0.3 µV/°C max input offset drift 0.4 nA max input bias current APPLICATIONS Weigh scales Industrial process controls Bridge amplifiers Precision data acquisition systems Medical instrumentation Strain gages Transducer interfaces GENERAL DESCRIPTION The AD8221 is a gain programmable, high performance instru- mentation amplifier that delivers the industry’s highest CMRR over frequency. The CMRR of instrumentation amplifiers on the market today falls off at 200 Hz. In contrast, the AD8221 maintains a minimum CMRR of 80 dB to 10 kHz for all grades at G = 1. High CMRR over frequency allows the AD8221 to reject wideband interference and line harmonics, greatly simplifying filter requirements. Possible applications include precision data acquisition, biomedical analysis, and aerospace instrumentation. Low voltage offset, low offset drift, low gain drift, high gain accuracy, and high CMRR make this part an excellent choice in applications that demand the best dc performance possible, such as bridge signal conditioning. CONNECTION DIAGRAM 8 7 6 5 1 2 3 4 –IN RG RG +VS VOUT REF –VS +IN TOP VIEW AD8221 Figure 1. SOIC and MSOP Connection Diagram 40 50 60 70 80 90 100 110 120 FREQUENCY (Hz) 100 10 1k 10k 100k AD8221 COMPETITOR 1 COMPETITOR 2 Figure 2. Typical CMRR vs. Frequency for G = 1 Programmable gain affords the user design flexibility. A single resistor sets the gain from 1 to 1000. The AD8221 operates on both single and dual supplies, and is well suited for applications where ±10 V input voltages are encountered. The AD8221 is available in low cost 8-lead SOIC and MSOP packages, both of which offer the industry’s best performance. The MSOP requires half the board space of the SOIC, making it ideal for multichannel or space-constrained applications. Performance is specified over the entire industrial temperature range of –40°C to +85°C for all grades. Furthermore, the AD8221 is operational from –40°C to +125°C1. 1 See Typical Performance Curves for expected operation from 85°C to 125°C. |
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