Bidirectional, Zero Drift, Current Sense Amplifier Data Sheet AD8418A FEATURES GENERAL DESCRIPTION Typical 0.1 V/C offset drift The AD8418A is a high voltage, high resolution current shunt Maximum 200 V voltage offset over full temperature range amplifier. It features an initial gain of 20 V/V, with a maximum 2.7 V to 5.5 V power supply operating range 0.15% gain error over the entire temperature range. The buffered Electromagnetic interference (EMI) filters included output voltage directly interfaces with any typical converter. The High common-mode input voltage range AD8418A offers excellent input common-mode rejection from 2 V to +70 V, continuous operation 2 V to +70 V. The AD8418A performs bidirectional current 3 V to +80 V, continuous survival measurements across a shunt resistor in a variety of automotive Minimum DC common-mode rejection ratio (CMRR): 90 dB and industrial applications, including motor control, power Initial gain = 20 V/V management, and solenoid control. Wide operating temperature range The AD8418A offers breakthrough performance throughout AD8418AWB and AD8418AB: 40C to +125C the 40C to +150C temperature range. It features a zero drift AD8418AWH: 40C to +150C core, which leads to a typical offset drift of 0.1 V/C throughout Bidirectional operation the operating temperature range and the common-mode voltage Available in 8-lead SOIC N, 8-lead MSOP, and FMEA tolerant range. The AD8418A is qualified for automotive applications. 10-lead MSOP pinout The device includes EMI filters and patented circuitry to enable AEC-Q100 qualified for automotive applications output accuracy with pulse-width modulation (PWM) type input common-mode voltages. The typical input offset voltage APPLICATIONS is 100 V. The AD8418A is offered in an 8-lead MSOP and an High-side current sensing in 8-lead SOIC N package with a 10-lead MSOP pinout option Motor controls engineered for failure mode and effects analysis (FMEA). Solenoid controls Power management Table 1. Related Devices Low-side current sensing Part No. Description Diagnostic protection AD8205 Current sense amplifier, gain = 50 AD8206 Current sense amplifier, gain = 20 AD8207 High accuracy current sense amplifier, gain = 20 AD8210 High speed current sense amplifier, gain = 20 AD8417 High accuracy current sense amplifier, gain = 60 FUNCTIONAL BLOCK DIAGRAM V = 2V TO +70V V = 2.7V TO 5.5V CM S 70V V V 1 S REF V OUT V V S CM AD8418A +IN EMI + FILTER I SHUNT 0V OUT G = 20 R SHUNT V /2 S IN EMI FILTER 50A I SHUNT 0V GND V 2 REF 50A Figure 1. Rev. E Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. Tel: 781.329.4700 20132020 Analog Devices, Inc. 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Trademarks and registered trademarks are the property of their respective owners. 11883-001AD8418A Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Bidirectional Operation ............................................................ 12 Applications ...................................................................................... 1 External Referenced Output ..................................................... 13 General Description ......................................................................... 1 Splitting the Supply .................................................................... 13 Functional Block Diagram .............................................................. 1 Splitting an External Reference ................................................ 13 Revision History ............................................................................... 2 Applications Information ............................................................. 14 Specifications .................................................................................... 3 Motor Control ............................................................................ 14 Absolute Maximum Ratings ........................................................... 4 Solenoid Control ........................................................................ 15 ESD Caution.................................................................................. 4 Pinout Option Engineered for FMEA ..................................... 16 Pin Configuration and Function Descriptions ............................ 5 Outline Dimensions ....................................................................... 17 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 18 Theory of Operation ...................................................................... 11 Automotive Products ................................................................ 18 Output Offset Adjustment ............................................................ 12 Unidirectional Operation .......................................................... 12 REVISION HISTORY 6/2020Rev. D to Rev. E 4/2017Rev. A to Rev. B Changes to Features Section and Changes to Features Section and General Description Section ....... 1 General Description Section ........................................................... 1 Changes to Table 2 ............................................................................ 3 Changes to Figure 2 Caption and Table 4 Title ........................... 6 Changes to Table 3 ............................................................................ 4 Change to Figure 18 .......................................................................... 8 Added Figure 3 and Table 5 Renumbered Sequentially ............ 6 Added Pinout Option Engineered for FMEA Section, Table 6, Added Figure 19 and Figure 20 Renumbered Sequentially ........ 8 and Table 7 ...................................................................................... 17 Updated Outline Dimensions ....................................................... 19 12/2014Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 19 Added AD8418AWH ........................................................ Universal Changes to Features Section and General Description Section ....... 1 12/2018Rev. C to Rev. D Changes to Specifications Section and Table 2 ............................. 3 Changes to Features Section ........................................................... 1 Changes to Table 3 ............................................................................ 4 Changes to Ordering Guide .......................................................... 16 Changes to Table 3 ........................................................................... 4 5/2018Rev. B to Rev. C 11/2013Revision 0: Initial Version Changes to Input Bias Current Parameter, Table 2 ..................... 3 Changes to Figure 20 ....................................................................... 8 Rev. E Page 2 of 18