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PDF AD8215 Data sheet ( Hoja de datos )
| Número de pieza | AD8215 | |
| Descripción | Current Shunt Monitor | |
| Fabricantes | Analog Devices | |
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Data Sheet
FEATURES
±4000 V human body model (HBM) ESD
High common-mode voltage range
−2 V to +65 V operating
−3 V to +68 V survival
Buffered output voltage
Wide operating temperature range
8-Lead SOIC: −40°C to +125°C
Excellent ac and dc performance
6 μV/°C typical offset drift
−8 ppm/°C typical gain drift
120 dB typical CMRR at dc
Qualified for automotive applications
APPLICATIONS
High-side current sensing
Motor controls
Transmission controls
Engine management
Suspension controls
Vehicle dynamic controls
DC to dc converters
GENERAL DESCRIPTION
The AD8215 is a high voltage, precision current shunt monitor.
It features a set gain of 20 V/V, with a maximum ±0.3% gain
error over the entire temperature range. The buffered output
voltage directly interfaces with any typical converter. Excellent
common-mode rejection from −2 V to +65 V is independent of
the 5 V supply. The AD8215 performs unidirectional current
measurements across a shunt resistor in a variety of industrial
and automotive applications, such as motor controls, solenoid
controls, or battery management.
High Voltage,
Current Shunt Monitor
AD8215
FUNCTIONAL BLOCK DIAGRAM
IN+ IN–
A1
PROPRIETARY
OFFSET
CIRCUITRY
V+
G = +20
OUT
AD8215
GND
Figure 1.
Special circuitry is devoted to output linearity being maintained
throughout the input differential voltage range of 0 mV to 250 mV,
regardless of the common-mode voltage present. The AD8215
has an operating temperature range of −40°C to +125°C and is
offered in a small 8-lead SOIC package.
Rev. B
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 ©2008–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8215
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Continuous Input Voltage (Survival)
Continuous Differential Input Voltage
Reverse Supply Voltage
ESD Rating
HBM
Charged Device Model (CDM)
Operating Temperature Range
Storage Temperature Range
Output Short-Circuit Duration
Rating
12.5 V
−3 V to +68 V
0.5 V
−0.3 V
±4000 V
±1000 V
−40°C to +125°C
−65°C to +150°C
Indefinite
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
ESD CAUTION
Data Sheet
Rev. B | Page 4 of 13
5 Page 
AD8215
THEORY OF OPERATION
In typical applications, the AD8215 amplifies a small differential
input voltage generated by the load current flowing through a
shunt resistor. The AD8215 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 AD8215.
ISHUNT
RSHUNT
IIN
R1
R
A1
PROPRIETARY
OFFSET
CIRCUITRY
V+
ROUT
G = +20
OUT =
(ISHUNT × RSHUNT) × 20
AD8215
GND
Figure 26. Simplified Schematic
Data Sheet
A load current flowing through the external shunt resistor
produces a voltage at the input terminals of the AD8215. R and
R1 connect the input terminals to A1. The inverting terminal,
which has very high input impedance, is held to
(VCM) − (ISHUNT × RSHUNT)
because negligible current flows through R. A1 forces the
noninverting input to the same potential. Therefore, the current
that flows through R1 is equal to
IIN = (ISHUNT × RSHUNT)/R1
This current (IIN) is converted back to a voltage via ROUT. The
output buffer amplifier has a gain of 20 V/V and offers excellent
accuracy as the internal gain setting resistors are precision trimmed
to within 0.01% matching. The resulting output voltage is equal to
OUT = (ISHUNT × RSHUNT) × 20
Rev. B | Page 10 of 13
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AD8215.PDF ] | |
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