AD8418AWBRZ-RL Datasheet AD8418ABRMZ-RL, AD8418AWBRMZ, AD8418AWBRZ | P1-P3

Bidirectional, Zero Drift,

Current Sense Amplifier

Data Sheet

AD8418A

Rev. B 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

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Technical Support www.analog.com

FEATURES

Typical 0.1 μV/°C offset drift

Maximum ±200 μV voltage offset over full temperature range

2.7 V to 5.5 V power supply operating range

Electromagnetic interference (EMI) filters included

High common-mode input voltage range

−2 V to +70 V continuous

−4 V to +85 V survival

Minimum DC common-mode rejection ratio (CMRR): 90 dB

Initial gain = 20 V/V

Wide operating temperature range

AD8418AWB: −40°C to +125°C

AD8418AWH: −40°C to +150°C

Bidirectional operation

Available in 8-lead SOIC and 8-lead MSOP

Qualified for automotive applications

APPLICATIONS

High-side current sensing in

Motor controls

Solenoid controls

Power management

Low-side current sensing

Diagnostic protection

GENERAL DESCRIPTION

The AD8418A is a high voltage, high resolution current shunt

amplifier. It features an initial gain of 20 V/V, with a maximum

±0.15% gain error over the entire temperature range. The buffered

output voltage directly interfaces with any typical converter. The

AD8418A offers excellent input common-mode rejection from

−2 V to +70 V. e AD8418A performs bidirectional current

measurements across a shunt resistor in a variety of automotive

and industrial applications, including motor control, power

management, and solenoid control.

The AD8418A offers breakthrough performance throughout

the −40°C to +150°C temperature range. It features a zero drift

core, which leads to a typical offset drift of 0.1 μV/°C throughout

the operating temperature range and the common-mode voltage

range. The AD8418A is qualified for automotive applications.

The device includes EMI filters and patented circuitry to enable

output accuracy with pulse-width modulation (PWM) type

input common-mode voltages. The typical input offset voltage

is ±100 μV. The AD8418A is offered in 8-lead MSOP and SOIC

packages.

Table 1. Related Devices

Part No. Description

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

SHUNT

G = 20

= –2V TO +70

= 2.7V TO 5.5

REF

OUT

SHUNT

EMI

FILTER

EMI

FILTER

70V

AD8418A

+IN

–IN

–

GND

–50A

50A

SHUNT

11883-001

Figure 1.

AD8418A Data Sheet

Rev. B | Page 2 of 17

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

Absolute Maximum Ratings ............................................................ 4

ESD Caution .................................................................................. 4

Pin Configuration and Function Descriptions ............................. 5

Typical Performance Characteristics ............................................. 6

Theory of Operation ...................................................................... 11

Output Offset Adjustment ............................................................. 12

Unidirectional Operation .......................................................... 12

Bidirectional Operation ............................................................. 12

External Referenced Output ..................................................... 13

Splitting the Supply .................................................................... 13

Splitting an External Reference ................................................ 13

Applications Information .............................................................. 14

Motor Control ............................................................................. 14

Solenoid Control ........................................................................ 15

Outline Dimensions ....................................................................... 16

Ordering Guide .......................................................................... 17

Automotive Products ................................................................. 17

REVISION HISTORY

4/2017—Rev. A to Rev. B

Changes to Features Section and General Description Section ....... 1

Changes to Table 2 ............................................................................ 3

Changes to Table 3 ............................................................................ 4

Change to Figure 18 ......................................................................... 8

Added Figure 19 and Figure 20; Renumbered Sequentially ....... 8

12/2014—Rev. 0 to Rev. A

Added AD8418AWH ......................................................... Universal

Changes to Features Section and General Description Section ........ 1

Changes to Specifications Section and Table 2 ............................. 3

Changes to Table 3 ............................................................................ 4

Changes to Ordering Guide .......................................................... 16

11/2013—Revision 0: Initial Version

Data Sheet AD8418A

Rev. B | Page 3 of 17

SPECIFICATIONS

= −40°C to +125°C (operating temperature range) for the AD8418AWB, T

= −40°C to +150°C for the AD8418AWH, V

= 5 V, unless

otherwise noted.

Table 2.

Parameter Test Conditions/Comments Min Typ Max Unit

GAIN

Initial 20 V/V

Error Over Temperature Specified temperature range ±0.15 %

Gain vs. Temperature −5 +5 ppm/°C

VOLTAGE OFFSET

Offset Voltage, Referred to the Input, RTI 25°C ±100 µV

Over Temperature, RTI Specified temperature range ±200 µV

Offset Drift −0.4 +0.1 +0.4 µV/°C

INPUT

Input Bias Current 130 µA

Input Voltage Range Common mode, continuous −2 +70 V

Common-Mode Rejection Ratio (CMRR)

Specified temperature range, f = dc

100

f = dc to 10 kHz 86 dB

OUTPUT

Output Voltage Range R

= 25 kΩ 0.032 V

− 0.032 V

Output Resistance 2 Ω

Maximum Capacitive Load No continuous oscillation 0 500 pF

DYNAMIC RESPONSE

Small Signal −3 dB Bandwidth 250 kHz

Slew Rate 1 V/µs

NOISE

0.1 Hz to 10 Hz (RTI) 2.3 µV p-p

Spectral Density, 1 kHz, RTI 110 nV/√Hz

OFFSET ADJUSTMENT

Ratiometric Accuracy

Divider to supplies 0.4985 0.5015 V/V

Accuracy, Referred to the Output (RTO) Voltage applied to V

REF

1 and V

REF

2 in parallel ±1 mV/V

Output Offset Adjustment Range V

= 5 V 0.032 V

− 0.032 V

POWER SUPPLY

Operating Range 2.7 5.5 V

Quiescent Current Over Temperature V

OUT

= 0.1 V dc

AD8418AWB 4.1 mA

AD8418AWH 4.2 mA

Power Supply Rejection Ratio 80 dB

TEMPERATURE RANGE

For Specified Performance Operating temperature range

AD8418AWB −40 +125 °C

AD8418AWH −40 +150 °C

The offset adjustment is ratiometric to the power supply when V

REF

1 and V

REF

2 are used as a divider between the supplies.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P17

AD8418AWBRZ-RL

Mfr. #:

Buy AD8418AWBRZ-RL

Manufacturer:

Analog Devices Inc.

Description:

Current Sense Amplifiers High Common Mode Cur Sense -3V to 80V

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

AD8418AWBRZ-RL

AD8418AWBRZ-RL

Products related to this Datasheet