ad8218brmz-rl Analog Devices, Inc., ad8218brmz-rl Datasheet

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ad8218brmz-rl

Manufacturer Part Number
ad8218brmz-rl
Description
Zero Drift, Bidirectional Current Shunt Monitor Ad8218
Manufacturer
Analog Devices, Inc.
Datasheet
FEATURES
High common-mode voltage range
Buffered output voltage
Gain = 20 V/V
Wide operating temperature range: −40°C to +125°C
Excellent ac and dc performance
APPLICATIONS
High-side current sensing
GENERAL DESCRIPTION
The AD8218 is a high voltage, high resolution current shunt
amplifier. It features a set gain of 20 V/V, with a maximum
±0.35% gain error over the entire temperature range. The
buffered output voltage directly interfaces with any typical
converter. The AD8218 offers excellent input common-mode
rejection from 4 V to 80 V. The AD8218 performs bidirectional
current measurements across a shunt resistor in a variety of
industrial and telecom applications, including motor control,
battery management, and base station power amplifier bias
control.
Rev. A
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.
4 V to 80 V operating
−0.3 V to 85 V survival
±100 nV/°C typical offset drift
±50 µV typical offset
±5 ppm/°C typical gain drift
110 dB typical CMRR at dc
48 V telecom
Power management
Base stations
Bidirectional motor control
Precision high voltage current sources
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The AD8218 offers breakthrough performance throughout the
−40°C to +125°C temperature range. It features a zero-drift core,
which leads to a typical offset drift of ±100 nV/°C throughout
the operating temperature range and the common-mode voltage
range. Special attention is devoted to output linearity being
maintained throughout the input differential voltage range of
0 mV to ~250 mV. The AD8218 also includes an internal 80 mV
reference that can be enabled for optimal dynamic range in
unidirectional current sense applications. The typical input
offset voltage is ±50 µV.
The AD8218 is offered in an 8-lead MSOP package.
ENB
+IN
–IN
FUNCTIONAL BLOCK DIAGRAM
Zero Drift, Bidirectional
Current Shunt Monitor
AD8218
R1
R2
REF
©2011 Analog Devices, Inc. All rights reserved.
LDO
Figure 1.
R3
R4
GND
V
S
AD8218
www.analog.com
OUT

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ad8218brmz-rl Summary of contents

Page 1

... The typical input offset voltage is ±50 µV. The AD8218 is offered in an 8-lead MSOP package. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved. AD8218 V S OUT GND www.analog.com ...

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AD8218 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 4 ESD Caution .................................................................................. 4 Pin Configuration and Function Descriptions ...

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SPECIFICATIONS T = −40°C to +125° 25°C, R OPR A L otherwise noted. Table 1. Parameter GAIN Initial Accuracy Accuracy over Temperature Gain vs. Temperature VOLTAGE OFFSET Offset Voltage (RTI 1 ) Over Temperature (RTI 1 ) Offset ...

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AD8218 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Maximum Input Voltage ( +IN, −IN to GND) Differential Input Voltage (+IN to –IN) Human Body Model (HBM) ESD Rating Operating Temperature Range (T ) OPR Storage Temperature Range Output Short-Circuit Duration Stresses ...

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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic 1 + ENB 4 GND 5 OUT REF 8 −IN +IN – AD8218 V REF ...

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AD8218 TYPICAL PERFORMANCE CHARACTERISTICS –40 – TEMPERATURE (°C) Figure 3. Typical Input Offset vs. Temperature 140 130 120 110 100 90 –40°C 80 +25°C +125° ...

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TEMPERATURE (°C) Figure 9. Supply Current vs. Temperature ( INPUT 5mV/DIV OUTPUT 100mV/DIV 1µs/DIV Figure 10. Rise Time (Differential Input = ...

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AD8218 INPUT 200mV/DIV OUTPUT 2V/DIV 5µs/DIV Figure 15. Differential Overload Recovery, Falling 82.0 81.5 81.0 80.5 80.0 79.5 79.0 –40 – TEMPERATURE (°C) Figure 16. Internal Reference Voltage vs. Temperature ( ...

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INPUT 50V/DIV OUTPUT 1V/DIV 500ns/DIV Figure 21. Common-Mode Step Response, Rising INPUT 50V/DIV OUTPUT 1V/DIV 1µs/DIV Figure 22. Common-Mode Step Response, Falling 180 150 120 –200 –100 0 100 V (µV) OSI Figure 23. Input Offset ...

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AD8218 THEORY OF OPERATION AMPLIFIER CORE In typical applications, the AD8218 amplifies a small differential input voltage generated by the load current flowing through a shunt resistor. The AD8218 rejects high common-mode vol- tages ( and provides ...

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APPLICATION NOTES SUPPLY (V ) CONNECTIONS S The AD8218 includes an internal LDO, which allows the user to leave the V pin floating, powering the AD8218 directly from S the voltage present at Pin 1 (+IN), provided this voltage is ...

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AD8218 APPLICATIONS INFORMATION UNIDIRECTIONAL HIGH-SIDE CURRENT SENSING In the unidirectional high-side current sensing configuration, the shunt resistor is referenced to the battery (see Figure 31). High voltage is present at the inputs of the current sense amplifier. When the shunt ...

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... OUTLINE DIMENSIONS IDENTIFIER ORDERING GUIDE Model Temperature Range 1 AD8218BRMZ −40°C to +125°C AD8218BRMZ-RL −40°C to +125° RoHS Compliant Part. 3.20 3.00 2.80 5. 3.20 4.90 3.00 4.65 1 2.80 4 PIN 1 0.65 BSC 0.95 15° MAX 0.85 1.10 MAX 0.75 0.15 0.23 6° 0.40 0.05 0.09 0° 0.25 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 36. 8-Lead Mini Small Outline Package [MSOP] ...

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AD8218 NOTES Rev Page ...

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NOTES Rev Page AD8218 ...

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... AD8218 NOTES ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09592-0-2/11(A) Rev Page ...

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