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AD8210YRZ-REEL 其他数据使用手册 - ADI（亚德诺）
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电源监控芯片
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SOIC-8
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高电压，双向电流分流监控器 High Voltage, Bidirectional Current Shunt Monitor
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AD8210YRZ-REEL数据手册
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AN-1308
APPLICATION NOTE
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Common-Mode Step Response of Current Sense Amplifiers
by Paul Blanchard and Anna Fe Briones
Rev. A | Page 1 of 6
INTRODUCTION
Current sense amplifiers are one of the specialty amplifiers from
Analog Devices, Inc., used to amplify small differential signals
in the presence of large common-mode voltages. A typical
application for a current sense amplifier is amplifying the voltage
across a shunt resistor. Analog Devices offers a variety of current
sense amplifiers that operate with supply voltages as low as 1.8 V
and withstand input common-mode voltages as high as 600 V.
Table 1. Supply Voltages and Input Common-Mode Voltages
of Analog Devices Current Sense Amplifiers
V
SUPPLY
Input Common-Mode Voltage
Device Number Min Max Min Max
AD8293G80 1.8 V 5.5 V 1.8 V 5.5 V
AD626 2.4 V 10 V −24 V 24 V
AD8274 2.5 V 18 V −40.5 V 40.5 V
AD8279 4 V 36 V −45.3 V 40.5 V
AD8210 4.5 V 5.5 V −2 V 65 V
AD8207 4.5 V 5.5 V −4 V 65 V
AD8418/AD8418A 2.7 V 5.5 V −2 V 70 V
AD628 4.5 V 36 V −120 V 120 V
AD629 5 V 36 V −270 V 270 V
AD8479 5 V 36 V −600 V 600 V
Many applications that use shunt resistors have common-mode
voltages that vary as a function of time. Some examples of shunt
applications with varying common-mode voltages are H bridge
motor drivers, solenoid controllers, and dc to dc switching
converters. In these applications, the common-mode voltages
seen by the current sense amplifier vary, in PWM fashion, from
a battery voltage to ground.
An ideal current sense amplifier does not react to the input
common-mode variation. In practice, the current sense
amplifier has a finite amount of common-mode rejection,
typically specified at dc and in the order of 100 µV/V or 80 dB.
Table 2. CMRR of Analog Devices Current Sense Amplifiers
In addition to the output errors due to the dc common-mode
rejection ratio (CMRR), there are errors associated with ac
CMRR and the common-mode step response of the amplifier.
This application note focuses on the common-mode step
response of current sense amplifiers
1
.
1
Protected by U. S. Patent No. 8,624,668; other patents pending.
Device Number CMRR (dB)
ADA4830-1 65
AD8270 76
AD8210 80
AD8207 80
AD8203 82
AD8418/AD8418A 86
AD8207 90
AD8210
100
AD8211 120
AD8293G80 140
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