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PDF AD8210 Data sheet ( Hoja de datos )
| Número de pieza | AD8210 | |
| Descripción | High-Side Bi-directional Current Shunt Monitor | |
| Fabricantes | Analog Devices | |
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Data Sheet
FEATURES
±4000 V HBM ESD
High common-mode voltage range
−2 V to +65 V operating
−5 V to +68 V survival
Buffered output voltage
5 mA output drive capability
Wide operating temperature range: −40°C to +125°C
Ratiometric half-scale output offset
Excellent ac and dc performance
1 μV/°C typical offset drift
10 ppm/°C typical gain drift
120 dB typical CMRR at dc
80 dB typical CMRR at 100 kHz
Available in 8-lead SOIC
Qualified for automotive applications
APPLICATIONS
Current sensing
Motor controls
Transmission controls
Diesel injection controls
Engine management
Suspension controls
Vehicle dynamic controls
DC-to-dc converters
GENERAL DESCRIPTION
The AD8210 is a single-supply, difference amplifier ideal for
amplifying small differential voltages in the presence of large
common-mode voltages. The operating input common-mode
voltage range extends from −2 V to +65 V. The typical supply
voltage is 5 V.
The AD8210 is offered in a SOIC package. The operating
temperature range is −40°C to +125°C.
Excellent ac and dc performance over temperature keep errors
in the measurement loop to a minimum. Offset drift and gain
drift are guaranteed to a maximum of 8 μV/°C and 20 ppm/°C,
respectively.
High Voltage, Bidirectional
Current Shunt Monitor
AD8210
FUNCTIONAL BLOCK DIAGRAM
VSUPPLY
IS
RS
+IN –IN
V+
VS
AD8210
LOAD
VREF1
G = +20
VOUT
GND
VREF2
Figure 1.
The output offset can be adjusted from 0.05 V to 4.9 V with
a 5 V supply by using the VREF1 pin and the VREF2 pin. With the
VREF1 pin attached to the V+ pin and the VREF2 pin attached to
the GND pin, the output is set at half scale. Attaching both VREF1
and VREF2 to GND causes the output to be unipolar, starting
near ground. Attaching both VREF1 and VREF2 to V+ causes the
output to be unipolar, starting near V+. Other offsets can be
obtained by applying an external voltage to VREF1 and VREF2.
Rev. D
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2006–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8210
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Continuous Input Voltage (VCM)
Reverse Supply Voltage
ESD Rating
HBM (Human Body Model)
CDM (Charged Device Model)
Operating Temperature Range
Storage Temperature Range
Output Short-Circuit Duration
Rating
12.5 V
−5 V to +68 V
0.3 V
±4000 V
±1000 V
−40°C to +125°C
−65°C to +150°C
Indefinite
Data Sheet
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. D | Page 4 of 16
5 Page 
AD8210
THEORY OF OPERATION
In typical applications, the AD8210 amplifies a small differential
input voltage generated by the load current flowing through a
shunt resistor. The AD8210 rejects high common-mode voltages
(up to 65 V) and provides a ground referenced buffered output
that interfaces with an analog-to-digital converter (ADC).
Figure 26 shows a simplified schematic of the AD8210.
The AD8210 is comprised of two main blocks, a differential
amplifier and an instrumentation amplifier. A load current
flowing through the external shunt resistor produces a voltage
at the input terminals of the AD8210. The input terminals are
connected to the differential amplifier (A1) by R1 and R2. A1
nulls the voltage appearing across its own input terminals by
adjusting the current through R1 and R2 with Q1 and Q2.
When the input signal to the AD8210 is 0 V, the currents in R1
and R2 are equal. When the differential signal is nonzero, the
current increases through one of the resistors and decreases in
the other. The current difference is proportional to the size and
polarity of the input signal.
Data Sheet
The differential currents through Q1 and Q2 are converted
into a differential voltage by R3 and R4. A2 is configured as an
instrumentation amplifier. The differential voltage is converted
into a single-ended output voltage by A2. The gain is internally
set with precision-trimmed, thin film resistors to 20 V/V.
The output reference voltage is easily adjusted by the VREF1 pin
and the VREF2 pin. In a typical configuration, VREF1 is connected
to VCC while VREF2 is connected to GND. In this case, the output
is centered at VCC/2 when the input signal is 0 V.
ISHUNT
RSHUNT
R1 R2
VS
AD8210
A1
VREF1
Q1 Q2
VOUT = (ISHUNT × RSHUNT) × 20
A2
R3 R4
GND
VREF2
Figure 26. Simplified Schematic
Rev. D | Page 10 of 16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AD8210.PDF ] | |
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