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AD621 Datasheet(PDF) 1 Page - Analog Devices |
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AD621 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page Low Noise, Low Gain Drift, G = 2000 Instrumentation Amplifier Data Sheet AD8428 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother 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 ©2011 Analog Devices, Inc. All rights reserved. FEATURES Fixed gain of 2000 Access to internal nodes provides flexibility Low noise: 1.5 nV/√Hz input voltage noise High accuracy dc performance Gain drift: 10 ppm/°C Offset drift: 1 μV/°C Gain accuracy: 0.2% CMRR: 130 dB min Excellent ac specifications Bandwidth: 3.5 MHz Slew rate: 40 V/μs Power supply range: ±4 V to ±18 V 8-pin SOIC package ESD protection >5000 V (HBM) Temperature range for specified performance: −40°C to +85°C Operational up to 125°C APPLICATIONS Sensor interface Medical instrumentation Patient monitoring FUNCTIONAL BLOCK DIAGRAM +IN –IN –FIL +FIL +VS –VS AD8428 3kΩ 6kΩ 6kΩ 6kΩ 6kΩ 120kΩ 120kΩ 30.15Ω 3kΩ OUT REF Figure 1. Table 1. Instrumentation Amplifiers by Category1 General- Purpose Zero Drift Military Grade Low Power Low Noise AD8220 AD8231 AD620 AD627 AD8428 AD8221 AD8290 AD621 AD623 AD8429 AD8222 AD8293 AD524 AD8235 AD8224 AD8553 AD526 AD8236 AD8228 AD8556 AD624 AD8426 AD8295 AD8557 AD8226 AD8227 1 See www.analog.com for the latest instrumentation amplifiers. GENERAL DESCRIPTION The AD8428 is an ultralow noise instrumentation amplifier designed to accurately measure tiny, high speed signals. It delivers industry-leading gain accuracy, noise, and bandwidth. All gain setting resistors for the AD8428 are internal to the part and are precisely matched. Care is taken in both the chip pinout and layout. This results in excellent gain drift and quick settling to the final gain value after the part is powered on. The high CMRR of the AD8428 prevents unwanted signals from corrupting the signal of interest. The pinout of the AD8428 is designed to avoid parasitic capacitance mismatches that can degrade CMRR at high frequencies. The AD8428 is one of the fastest instrumentation amplifiers available. The circuit architecture is designed for high bandwidth at high gain. The AD8428 uses a current feedback topology for the initial preamplifier gain stage of 200, followed by a difference amplifier stage of 10. This architecture results in a 3.5 MHz bandwidth at a gain of 2000 for an equivalent gain bandwidth product of 7 GHz. The AD8428 pinout allows access to internal nodes between the first and second stages. This feature can be useful for modifying the frequency response between the two amplification stages, thereby preventing unwanted signals from contaminating the output results. The performance of the AD8428 is specified over the industrial temperature range of −40°C to +85°C. It is available in an 8-lead plastic SOIC package. |
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