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AD8225 Datasheet(PDF) 1 Page - Analog Devices |
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AD8225 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page 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. 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 companies. 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. AD8225 Precision Gain of 5 Instrumentation Amplifier FEATURES No External Components Required Highly Stable, Factory Trimmed Gain of 5 Low Power, 1.2 mA Max Supply Current Wide Power Supply Range ( 1.7 V to 18 V) Single- and Dual-Supply Operation Excellent Dynamic Performance High CMRR 86 dB Min @ DC 80 dB Min to 10 kHz Wide Bandwidth 900 kHz 4 V to 36 V Single Supply High Slew Rate 5 V/ s Min Outstanding DC Precision Low Gain Drift 5 ppm/ C Max Low Input Offset Voltage 150 V Max Low Offset Drift 2 V/ C Max Low Input Bias Current 1.2 nA Max APPLICATIONS Patient Monitors Current Transmitters Multiplexed Systems 4 to 20 mA Converters Bridge Transducers Sensor Signal Conditioning FUNCTIONAL BLOCK DIAGRAM 8 7 6 5 1 2 3 4 NC = NO CONNECT NC –IN +IN –VS NC +VS VOUT REF AD8225 GENERAL DESCRIPTION The AD8225 is an instrumentation amplifier with a fixed gain of 5 , which sets new standards of performance. The superior CMRR of the AD8225 enables rejection of high frequency common-mode voltage (80 dB Min @ 10 kHz). As a result, higher ambient levels of noise from utility lines, industrial equipment, and other radiating sources are rejected. Extended CMV range enables the AD8225 to extract low level differential signals in the presence of high common-mode dc voltage levels even at low supply voltages. Ambient electrical noise from utility lines is present at 60 Hz and harmonic frequencies. Power systems operating at 400 Hz create high noise environments in aircraft instrument clusters. Good CMRR performance over frequency is necessary if power system generated noise is to be rejected. The dc to 10 kHz FREQUENCY – Hz 140 1 100k 10 100 1k 10k 130 120 110 100 90 80 70 60 50 40 30 HIGH PERFORMANCE IN AMP @ GAIN OF 5 AD8225 Figure 1. Typical CMRR vs. Frequency CMRR performance of the AD8225 rejects noise from utility systems, motors, and repair equipment on factory floors, switch- ing power supplies, and medical equipment. Low input bias currents combined with a high slew rate of 5 V/ µs make the AD8225 ideally suited for multiplexed applications. The AD8225 provides excellent dc precision, with maximum input offset voltage of 150 µV and drift of 2 µV/°C. Gain drift is 5ppm/ °C or less. Operating on either single or dual supplies, the fixed gain of 5 and wide input common-mode voltage range make the AD8225 well suited for patient monitoring applications. The AD8225 is packaged in an 8-lead SOIC package and is specified over the standard industrial temperature range, –40 °C to +85 °C. |
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