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AD8418WBRZ-RL Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD8418WBRZ-RL
Szczegółowy opis  Bidirectional, Zero Drift, Current Sense Amplifier
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD8418WBRZ-RL Arkusz danych(HTML) 10 Page - Analog Devices

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AD8418
Data Sheet
THEORY OF OPERATION
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.
In typical applications, the AD8418 is used to measure current
by amplifying the voltage across a shunt resistor connected to its
inputs by a gain of 20 V/V (see Figure 26).
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.
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.
The reference inputs, VREF1 and VREF2, are tied through 100 kΩ
resistors to the positive input of the main amplifier, which allows
the output offset to be adjusted anywhere in the output operating
range. The gain is 1 V/V from the reference pins to the output
when the reference pins are used in parallel. When the pins are
used to divide the supply, the gain is 0.5 V/V.
The AD8418 offers breakthrough performance without
compromising any of the robust application needs typical of
solenoid or motor control. The ability to reject PWM input
common-mode voltages and the zero drift architecture
providing low offset and offset drift allows the AD8418 to
deliver total accuracy for these demanding applications.
+
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 26. Typical Application
Rev. 0 | Page 10 of 16


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