High Voltage
Current Shunt Monitor
AD8211
FEATURES
±4000 V 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
5-lead SOT: −40°C to +125°C
Excellent ac and dc performance
5 μV/°C typical offset drift
−13 ppm/°C typical gain drift
120 dB typical CMRR at dc
FUNCTIONAL BLOCK DIAGRAM
V
IN+
V
IN–
A1
PROPRIETARY
OFFSET
CIRCUITRY
V+
OUT
G = +20
APPLICATIONS
High-side current sensing
Motor controls
Transmission controls
Engine management
Suspension controls
Vehicle dynamic controls
DC-to-dc converters
GND
Figure 1.
GENERAL DESCRIPTION
The AD8211 is a high voltage, precision current shunt amplifier.
It features a set gain of 20 V/V, with a typical ±0.5% 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 AD8211 performs unidirectional current measure-
ments across a shunt resistor in a variety of industrial and
automotive applications, such as motor control, solenoid
control, or battery management.
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 AD8211
has an operating temperature range of −40°C to +125°C and is
offered in a small 5-lead SOT package.
Rev. 0
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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
06824-001
AD8211
AD8211
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 10
Application Notes ........................................................................... 11
Output Linearity......................................................................... 11
Applications Information .............................................................. 12
High-Side Current Sense with a Low-Side Switch................. 12
High-Side Current Sensing ....................................................... 12
Low-Side Current Sensing ........................................................ 12
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 13
REVISION HISTORY
7/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 16
AD8211
SPECIFICATIONS
T
OPR
= −40°C to +125°C, T
A
= 25°C, V
S
= 5 V, R
L
= 25 kΩ (R
L
is the output load resistor), unless otherwise noted.
Table 1.
Parameter
GAIN
Initial
Accuracy
Accuracy Over Temperature
Gain vs. Temperature
VOLTAGE OFFSET
Offset Voltage (RTI)
Over Temperature (RTI)
Offset Drift
INPUT
Input Impedance
Differential
Common Mode
Common-Mode Input Voltage Range
Differential Input Voltage Range
Common-Mode Rejection
OUTPUT
Output Voltage Range Low
Output Voltage Range High
Output Impedance
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
Slew Rate
NOISE
0.1 Hz to 10 Hz, RTI
Spectral Density, 1 kHz, RTI
POWER SUPPLY
Operating Range
Quiescent Current Over Temperature
Power Supply Rejection Ratio
TEMPERATURE RANGE
For Specified Performance
1
2
Min
Typ
20
Max
Unit
V/V
%
%
ppm/°C
mV
mV
μV/°C
Conditions
±0.25
±0.35
−13
±1
±2.2
5
V
O
≥ 0.1 V dc
T
OPR
T
OPR 1
25°C
T
OPR
T
OPR 2
5
5
3.5
−2
100
80
0.1
250
120
90
0.05
4.95
2
500
4.5
7
70
4.5
1.2
76
−40
+125
5.5
2.0
+65
kΩ
MΩ
kΩ
V
mV
dB
dB
V
V
Ω
kHz
V/μs
μV p-p
nV/√Hz
V
mA
dB
°C
Common-mode voltage > 5 V
Common-mode voltage < 5 V
Common-mode continuous
Differential input voltage
T
A
, f = dc, V
CM
> 5 V, see Figure 5
T
A
, f = dc, V
CM
< 5 V, see Figure 5
4.9
V
CM
> 5 V
3
, see Figure 12
The mean of the gain drift distribution is typically −13 ppm/°C, with a σ = 3 ppm/°C.
The mean of the offset drift distribution is typically +5 μV/°C, with a σ = 3 μV/°C.
3
When the input common-mode voltage is less than 5 V, the supply current increases, which can be calculated by I
S
= −0.275 (V
CM
) + 2.5.
Rev. 0 | Page 3 of 16
AD8211
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Continuous Input Voltage
Reverse Supply Voltage
HBM (Human Body Model) ESD Rating
CDM (Charged Device Model) ESD Rating
Operating Temperature Range
Storage Temperature Range
Output Short-Circuit Duration
Rating
12.5 V
−3 V to +68 V
−0.3 V
±4000 V
±1000 V
−40°C to +125°C
−65°C to +150°C
Indefinite
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. 0 | Page 4 of 16
AD8211
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
OUT
1
5
V+
AD8211
1
2
5
GND
2
V
IN+ 3
TOP VIEW
(Not to Scale)
06824-002
4
V
IN–
NC = NO CONNECT
Figure 3. Pin Configuration
Figure 2. Metallization Diagram
Table 3. Pin Function Descriptions
Pin No.
1
2
3
4
5
Mnemonic
OUT
GND
V
IN+
V
IN−
V+
X
−277
−140
−228
+229
+264
Y
+466
+466
−519
−519
+466
Description
Buffered Output.
Ground.
Noninverting Input.
Inverting Input.
Supply.
06824-030
3
4
Rev. 0 | Page 5 of 16
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