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AD8418 Current Sense Amplifier: Pinout, Equivalent and Datasheet

Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) Current Sense 5V -40°C~125°C AD8418 0.65mm Current Sense Amplifiers Zero Drift ,Precision Current Sense AMP

195

Dec 1, 2021

Kay Locke

Current Sense Amplifiers (1/2): Why not to use an OpAmp (CMRR etc.)

 

Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) Current Sense 5V -40°C~125°C AD8418 0.65mm Current Sense Amplifiers Zero Drift ,Precision Current Sense AMP

The AD8418 is a high voltage, high resolution current shunt amplifier. The AD8418 is fully qualified for automotive applications and includes EMI filters and patented circuitry to enable output accuracy with pulse-width modulation (PWM) type input common-mode voltages. Furthermore, Huge range of Semiconductors, Capacitors, Resistors and IcS in stock. Welcome RFQ.

AD8418WBRMZ

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AD8418 Pinout

The following figure is the diagram of AD8418 pinout.

 

 

          Pin No.              Mnemonic                                                         Description
1 ﹣IN Negative Input.
2 GND Ground.
3 VREF2 Reference Input 2.
4 NC No Connect. Do not connect to this pin.
5 OUT Output.
6 VS Supply.
7 VREF1 Reference Input 1.
8 ﹢IN Positive Input.

Pin Function Descriptions

AD8418 CAD Model

The followings are AD8418 Symbol, Footprint, and 3D Model.

PCB Symbol

 

PCB Footprint

 

3D Model

 

AD8418 Overview

The AD8418 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 AD8418 offers excellent input common-mode rejection from −2 V to +70 V. The AD8418 performs bidirectional current measurements across a shunt resistor in a variety of automotive and industrial applications, including motor control, battery management, and solenoid control. The AD8418 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 0.1 µV/°C throughout the operating temperature range and the common-mode voltage range. The AD8418 is fully qualified for automotive applications and 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 ±200 µV. The AD8418 is offered in 8-lead MSOP and SOIC packages.

This article provides you with a basic overview of the AD8418 Current Sense Amplifier, including its pin descriptions, features and specifications, etc., to help you quickly understand what AD8418 is.

AD8418 Features

● Typical 0.1 µV/°C offset drift

● Maximum ±400 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 operating

   ◆ −4 V to +85 V survival

● Initial gain = 20 V/V

● Wide operating temperature range: −40°C to +125°C

● Bidirectional operation

● Available in 8-lead SOIC and 8-lead MSOP

● Common-mode rejection ratio (CMRR): 86 dB, dc to 10 kHz

● Qualified for automotive applications

Specifications

Analog Devices Inc. AD8418WBRMZ technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. AD8418WBRMZ.

AD8418WBRMZ Tech Specifications

Analog Devices Inc. AD8418WBRMZ technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. AD8418WBRMZ.

Product Attribute Attribute Value
Lifecycle StatusPRODUCTION (Last Updated: 2 weeks ago)
Factory Lead Time26 Weeks
Contact PlatingTin
MountSurface Mount
Mounting TypeSurface Mount
Package / Case8-TSSOP, 8-MSOP (0.118, 3.00mm Width)
Number of Pins8Pins
Weight139.989945mg
Usage LevelAutomotive grade
Operating Temperature-40°C~125°C
PackagingTube
SeriesAutomotive
JESD-609 Codee3
Pbfree Codeno
Part StatusActive
Moisture Sensitivity Level (MSL)1 (Unlimited)
Number of Terminations8Terminations
ECCN CodeEAR99
Product Attribute Attribute Value
Terminal PositionDUAL
Terminal FormGULL WING
Peak Reflow Temperature (Cel)260
Number of Functions1Function
Supply Voltage5V
Terminal Pitch0.65mm
Time@Peak Reflow Temperature-Max (s)30
Base Part NumberAD8418
Pin Count8
Qualification StatusNot Qualified
Output Voltage5V
Operating Supply Voltage5V
Power Supplies5V
Number of Channels1Channel
Operating Supply Current2.6mA
Nominal Supply Current2.6mA
Max Supply Current130μA
Slew Rate1V/μs
Product Attribute Attribute Value
Amplifier TypeCurrent Sense
Common Mode Rejection Ratio100 dB
Voltage - Supply, Single/Dual (±)2.7V~5.5V
Input Offset Voltage (Vos)200μV
Bandwidth250 kHz
Gain Bandwidth Product250 kHz
Power Supply Rejection Ratio (PSRR)80dB
Supply Voltage Limit-Max6V
Input Capacitance2pF
Input Bias Current130μA
Height950μm
Length3.2mm
Width3.2mm
REACH SVHCNo SVHC
RoHS StatusROHS3 Compliant
Lead FreeContains Lead
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AD8418 Functional Block Diagram

The following is the Block Diagram of AD8418.

Functional Block Diagram

AD8418 Equivalent

               Model number             Manufacturer                                         Description
AD8418BRMZ Analog Devices Inc Bidirectional, Zero-Drift, Current Sense Amplifier
AD8418WBRMZ-RL Analog Devices Inc Bidirectional, Zero-Drift, Current Sense Amplifier
AD8418WBRZ-RL Analog Devices Inc Bidirectional, Zero-Drift, Current Sense Amplifier
AD8418WBRZ Analog Devices Inc Bidirectional, Zero-Drift, Current Sense Amplifier

AD8418 Applications

● High-side current sensing in:

   ◆ Motor controls

   ◆ Solenoid controls

   ◆ Power management

● Low-side current sensing

● Diagnostic protection

AD8418 Package

The following diagram shows the AD8418 package.

8-Lead Mini Small Outline Package

AD8418 Manufacturer

Analog Devices (NASDAQ: ADI) is a world leader in the design, manufacture, and marketing of a broad portfolio of high performance analog, mixed-signal, and digital signal processing (DSP) integrated circuits (ICs) used in virtually all types of electronic equipment. Since our inception in 1965, we have focused on solving the engineering challenges associated with signal processing in electronic equipment. Used by over 100,000 customers worldwide, our signal processing products play a fundamental role in converting, conditioning, and processing real-world phenomena such as temperature, pressure, sound, light, speed, and motion into electrical signals to be used in a wide array of electronic devices.

Datasheet PDF

Download datasheets and manufacturer documentation for Analog Devices Inc. AD8418WBRMZ.

AD8418WBRMZ Documents

Download datasheets and manufacturer documentation for AD8418WBRMZ

Frequently Asked Questions

What is the essential property of the AD8418?
The AD8418 is a single-supply, zero drift, difference amplifier that uses a unique architecture to accurately amplify small differential current shunt voltages in the presence of rapidly changing common-mode voltages.
What is unique about the design of the AD8418?
The AD8418 is designed to provide excellent common-mode rejection, even with PWM common-mode inputs that can change at very fast rates, for example, 1 V/ns. The AD8418 contains patented technology to eliminate the negative effects of such fast changing external common-mode variations.
How is the input offset drift of the AD8418 implemented?
The AD8418 features an input offset drift of less than 500 nV/°C. This performance is achieved through a novel zero drift architecture that does not compromise bandwidth, which is typically rated at 250 kHz.
Does the AD8418 have breakthrough performance?
The AD8418 offers breakthrough performance without compromising any of the robust application needs typical of solenoid or motor control.
FAQ
What is the essential property of the AD8418?
The AD8418 is a single-supply, zero drift, difference amplifier that uses a unique architecture to accurately amplify small differential current shunt voltages in the presence of rapidly changing common-mode voltages.
What is unique about the design of the AD8418?
The AD8418 is designed to provide excellent common-mode rejection, even with PWM common-mode inputs that can change at very fast rates, for example, 1 V/ns. The AD8418 contains patented technology to eliminate the negative effects of such fast changing external common-mode variations.
How is the input offset drift of the AD8418 implemented?
The AD8418 features an input offset drift of less than 500 nV/°C. This performance is achieved through a novel zero drift architecture that does not compromise bandwidth, which is typically rated at 250 kHz.
Does the AD8418 have breakthrough performance?
The AD8418 offers breakthrough performance without compromising any of the robust application needs typical of solenoid or motor control.

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