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AD8421ARMZ датащи(PDF) 1 Page - Analog Devices |
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AD8421ARMZ датащи(HTML) 1 Page - Analog Devices |
1 / 28 page 3 nV/√Hz, Low Power Instrumentation Amplifier Data Sheet AD8421 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved. FEATURES Low power 2.3 mA maximum supply current Low noise 3.2 nV/√Hz maximum input voltage noise at 1 kHz 200 fA/√Hz current noise at 1 kHz Excellent ac specifications 10 MHz bandwidth (G = 1) 2 MHz bandwidth (G = 100) 0.6 μs settling time to 0.001% (G = 10) 80 dB CMRR at 20 kHz (G = 1) 35 V/μs slew rate High precision dc performance (AD8421BRZ) 94 dB CMRR minimum (G = 1) 0.2 μV/°C maximum input offset voltage drift 1 ppm/°C maximum gain drift (G = 1) 500 pA maximum input bias current Inputs protected to 40 V from opposite supply ±2.5 V to ±18 V dual supply (5 V to 36 V single supply) Gain set with a single resistor (G = 1 to 10,000) APPLICATIONS Medical instrumentation Precision data acquisition Microphone preamplification Vibration analysis Multiplexed input applications ADC driver PIN CONNECTION DIAGRAM TOP VIEW (Not to Scale) –IN 1 RG 2 RG 3 +IN 4 +VS 8 VOUT 7 REF 6 –VS 5 AD8421 Figure 1. 10µ 1n 100 1M SOURCE RESISTANCE, RS (Ω) 1µ 100n 10n 1k 10k 100k G = 100 AD8421 BEST AVAILABLE 1mA LOW POWER IN-AMP BEST AVAILABLE 7mA LOW NOISE IN-AMP RS NOISE ONLY Figure 2. Noise Density vs. Source Resistance GENERAL DESCRIPTION The AD8421 is a low cost, low power, extremely low noise, ultralow bias current, high speed instrumentation amplifier that is ideally suited for a broad spectrum of signal conditioning and data acquisition applications. This product features extremely high CMRR, allowing it to extract low level signals in the presence of high frequency common-mode noise over a wide temperature range. The 10 MHz bandwidth, 35 V/μs slew rate, and 0.6 μs settling time to 0.001% (G = 10) allow the AD8421 to amplify high speed signals and excel in applications that require high channel count, multiplexed systems. Even at higher gains, the current feedback architecture maintains high performance; for example, at G = 100, the bandwidth is 2 MHz and the settling time is 0.8 μs. The AD8421 has excellent distortion performance, making it suitable for use in demanding applications such as vibration analysis. The AD8421 delivers 3 nV/√Hz input voltage noise and 200 fA/√Hz current noise with only 2 mA quiescent current, making it an ideal choice for measuring low level signals. For applications with high source impedance, the AD8421 employs innovative process technology and design techniques to provide noise performance that is limited only by the sensor. The AD8421 uses unique protection methods to ensure robust inputs while still maintaining very low noise. This protection allows input voltages up to 40 V from the opposite supply rail without damage to the part. A single resistor sets the gain from 1 to 10,000. The reference pin can be used to apply a precise offset to the output voltage. The AD8421 is specified from −40°C to +85°C and has typical performance curves to 125°C. It is available in 8-lead MSOP and SOIC packages. |
Аналогичный номер детали - AD8421ARMZ |
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Аналогичное описание - AD8421ARMZ |
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