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AD8295 Datasheet(PDF) 1 Page - Analog Devices |
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AD8295 Datasheet(HTML) 1 Page - Analog Devices |
1 / 21 page Low Cost Low Power Instrumentation Amplifier AD620 Rev. H 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© 2003–2011 Analog Devices, Inc. All rights reserved. FEATURES Easy to use Gain set with one external resistor (Gain range 1 to 10,000) Wide power supply range (±2.3 V to ±18 V) Higher performance than 3 op amp IA designs Available in 8-lead DIP and SOIC packaging Low power, 1.3 mA max supply current Excellent dc performance (B grade) 50 μV max, input offset voltage 0.6 μV/°C max, input offset drift 1.0 nA max, input bias current 100 dB min common-mode rejection ratio (G = 10) Low noise 9 nV/√Hz @ 1 kHz, input voltage noise 0.28 μV p-p noise (0.1 Hz to 10 Hz) Excellent ac specifications 120 kHz bandwidth (G = 100) 15 μs settling time to 0.01% APPLICATIONS Weigh scales ECG and medical instrumentation Transducer interface Data acquisition systems Industrial process controls Battery-powered and portable equipment CONNECTION DIAGRAM –IN RG –VS +IN RG +VS OUTPUT REF 1 2 3 4 8 7 6 5 AD620 TOP VIEW Figure 1. 8-Lead PDIP (N), CERDIP (Q), and SOIC (R) Packages PRODUCT DESCRIPTION The AD620 is a low cost, high accuracy instrumentation amplifier that requires only one external resistor to set gains of 1 to 10,000. Furthermore, the AD620 features 8-lead SOIC and DIP packaging that is smaller than discrete designs and offers lower power (only 1.3 mA max supply current), making it a good fit for battery-powered, portable (or remote) applications. The AD620, with its high accuracy of 40 ppm maximum nonlinearity, low offset voltage of 50 μV max, and offset drift of 0.6 μV/°C max, is ideal for use in precision data acquisition systems, such as weigh scales and transducer interfaces. Furthermore, the low noise, low input bias current, and low power of the AD620 make it well suited for medical applications, such as ECG and noninvasive blood pressure monitors. The low input bias current of 1.0 nA max is made possible with the use of Superϐeta processing in the input stage. The AD620 works well as a preamplifier due to its low input voltage noise of 9 nV/√Hz at 1 kHz, 0.28 μV p-p in the 0.1 Hz to 10 Hz band, and 0.1 pA/√Hz input current noise. Also, the AD620 is well suited for multiplexed applications with its settling time of 15 μs to 0.01%, and its cost is low enough to enable designs with one in-amp per channel. Table 1. Next Generation Upgrades for AD620 Part Comment AD8221 Better specs at lower price AD8222 Dual channel or differential out AD8226 Low power, wide input range AD8220 JFET input AD8228 Best gain accuracy AD8295 +2 precision op amps or differential out AD8429 Ultra low noise 0 5 10 15 20 30,000 5,000 10,000 15,000 20,000 25,000 0 SUPPLY CURRENT (mA) AD620A RG 3 OP AMP IN-AMP (3 OP-07s) Figure 2. Three Op Amp IA Designs vs. AD620 |
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