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AD8418BRMZ-RL データシート(PDF) 1 Page - Analog Devices

部品番号 AD8418BRMZ-RL
部品情報  Bidirectional, Zero Drift, Current Sense Amplifier
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD8418BRMZ-RL データシート(HTML) 1 Page - Analog Devices

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Bidirectional, Zero Drift,
Current Sense Amplifier
Data Sheet
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
APPLICATIONS
High-side current sensing in
Motor controls
Solenoid controls
Power management
Low-side current sensing
Diagnostic protection
GENERAL DESCRIPTION
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.
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
FUNCTIONAL BLOCK DIAGRAM
+
ISHUNT
G = 20
VCM = –2V TO +70V
VS = 2.7V TO 5.5V
VREF1
VREF2
OUT
0V
VS
VS/2
VOUT
ISHUNT
EMI
FILTER
EMI
FILTER
VCM
0V
70V
AD8418
VS
+IN
–IN
GND
–50A
50A
RSHUNT
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
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


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