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AD8451-EVALZ データシート(PDF) 1 Page - Analog Devices |
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AD8451-EVALZ データシート(HTML) 1 Page - Analog Devices |
1 / 32 page Low Cost, Precision Analog Front End and Controller for Battery Test/Formation Systems Data Sheet AD8451 FEATURES Integrated constant current and voltage modes with automatic switchover Charge and discharge modes Precision voltage and current measurement Integrated precision control feedback blocks Precision interface to PWM or linear power converters Fixed gain settings Current sense gain: 26 V/V (typ) Voltage sense gain: 0.8 V/V (typ) Excellent ac and dc performance Maximum offset voltage drift: 0.9 µV/°C Maximum gain drift: 3 ppm/°C Low current sense amplifier input voltage noise: 9 nV/√Hz typ Current sense CMRR: 108 dB min TTL compliant logic APPLICATIONS Battery cell formation and testing Battery module testing GENERAL DESCRIPTION The AD8451 is a precision analog front end and controller for testing and monitoring battery cells. A precision fixed gain instrumentation amplifier (IA) measures the battery charge/ discharge current, and a fixed gain difference amplifier (DA) measures the battery voltage (see Figure 1). Internal laser trimmed resistor networks set the gains for the IA and the DA, optimizing the performance of the AD8451 over the rated temperature range. The IA gain is 26 V/V and the DA gain is 0.8 V/V. Voltages at the ISET and VSET inputs set the desired constant current (CC) and constant voltage (CV) values. CC to CV switching is automatic and transparent to the system. A TTL logic level input, MODE, selects the charge or discharge mode (high for charge, and low for discharge). An analog output, VCTRL, interfaces directly with the Analog Devices, Inc., ADP1972 pulse-width modulation (PWM) controller. The AD8451 simplifies designs by providing excellent accuracy, performance over temperature, flexibility with functionality, and overall reliability in a space-saving package. The AD8451 is available in an 80-lead, 14 mm × 14 mm × 1.40 mm LQFP and is rated for an operating temperature of −40°C to +85°C. FUNCTIONAL BLOCK DIAGRAM CURRENT SENSE IA VOLTAGE SENSE DA ISMEA ISET BVMEA VSET VINT MUX ISVN ISVP BVN BVP VINT VCTRL ×1 MODE AD8451 IVE0/IVE1 VVE0/ VVE1 (CHARGE/ DISCHARGE) SWITCHING VVP0 VSETBF VCLP VCLN BVREFH/ BVREFL ISREFH/ ISREFL VREF 0.8 VOLTAGE REFERENCE CONSTANT VOLTAGE LOOP FILTER CONSTANT CURRENT LOOP FILTER 26 Figure 1. Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 ©2014 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com |
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