AD8211WYRJZ-R7 [ADI]
High Voltage Current Shunt Monitor; 高压电流分流监控器
| 型号： | AD8211WYRJZ-R7 |
| 厂家： | 
ADI |
| 描述： | High Voltage Current Shunt Monitor |
| 文件： | 总16页 (文件大小：309K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
High Voltage
Current Shunt Monitor
AD8211
FUNCTIONAL BLOCK DIAGRAM
FEATURES
V
V
IN–
IN+
Qualified for automotive applications
4000 V HBM ESD
High common-mode voltage range
−2 V to +65 V operating
−3 V to +68 V survival
V+
A1
Buffered output voltage
PROPRIETARY
OFFSET
CIRCUITRY
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
OUT
G = +20
AD8211
GND
Figure 1.
APPLICATIONS
High-side current sensing
Motor controls
Transmission controls
Engine management
Suspension controls
Vehicle dynamic controls
DC-to-dc converters
GENERAL DESCRIPTION
The AD8211 is a high voltage, precision current shunt amplifier.
It features a set gain of 20 V/V, with a typical 0.35% 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. A
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 registeredtrademarks arethe 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 ©2007-2011 Analog Devices, Inc. All rights reserved.
AD8211
TABLE OF CONTENTS
Features .............................................................................................. 1
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
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
REVISION HISTORY
3/11—Rev. 0 to Rev. A
Added Automotive Products Information................. Throughout
Changes to General Description, Gain Error Percentage ........... 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 4
Updated Outline Dimensions....................................................... 13
Changes to Ordering Guide .......................................................... 13
7/07—Revision 0: Initial Version
Rev. A | Page 2 of 16
AD8211
SPECIFICATIONS
TOPR = −40°C to +125°C, TA = 25°C, VS = 5 V, RL = 25 kΩ (RL is the output load resistor), unless otherwise noted.
Table 1.
Y GRADE
Typ
W GRADE
Typ
Parameter
GAIN
Min
Max
Min
Max
Unit
Conditions
Initial
Accuracy
20
20
V/V
%
0.2ꢀ
0.2ꢀ
VO ≥ 0.1 V dc
Accuracy Over Temperature
Gain vs. Temperature
0.3ꢀ
−13
0.ꢁ
%
TOPR
1
−13
ppm/°C TOPR
VOLTAGE OFFSET
Offset Voltage (RTI)
Over Temperature (RTI)
Offset Drift
1
1
2.ꢀ
mV
mV
μV/°C
2ꢀ°C
TOPR
TOPR
2.2
ꢀ
2
ꢀ
INPUT
Input Impedance
Differential
Common Mode
ꢀ
ꢀ
3.ꢀ
ꢀ
ꢀ
3.ꢀ
kΩ
MΩ
kΩ
V
Common-mode voltage > ꢀ V
Common-mode voltage < ꢀ V
Common-mode continuous
Common-Mode Input Voltage
Range
−2
+6ꢀ
−2
+6ꢀ
Differential Input Voltage Range
Common-Mode Rejection
2ꢀ0
120
2ꢀ0
120
mV
dB
Differential input voltage
TOPR, f = dc, VCM > ꢀ V, see
Figure ꢀ
TOPR, f = dc, VCM < ꢀ V, see
Figure ꢀ
100
80
100
80
90
90
dB
OUTPUT
TOPR
TOPR
Output Voltage Range Low
Output Voltage Range High
Output Impedance
0.1
0.0ꢀ
ꢁ.9ꢀ
2
0.1
0.0ꢀ
ꢁ.9ꢀ
2
V
V
Ω
ꢁ.9
ꢁ.9
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
Slew Rate
ꢀ00
ꢁ.ꢀ
ꢀ00
ꢁ.ꢀ
kHz
V/μs
NOISE
0.1 Hz to 10 Hz, RTI
7
7
μV p-p
Spectral Density, 1 kHz, RTI
POWER SUPPLY
70
70
nV/√Hz
Operating Range
ꢁ.ꢀ
76
ꢀ.ꢀ
2.0
ꢁ.ꢀ
76
ꢀ.ꢀ
2.0
V
mA
dB
Quiescent Current OverTemperature
Power Supply Rejection Ratio
TEMPERATURE RANGE
For Specified Performance
1.2
1.2
VCM > ꢀ V3, see Figure 12
−ꢁ0
+12ꢀ
−ꢁ0
+12ꢀ °C
1 The mean of the gain drift distribution is typically −13 ppm/°C, with a σ = 3 ppm/°C.
2 The mean of the offset drift distribution is typically +ꢀ μV/°C, with a σ = 3 μV/°C.
3 When the input common-mode voltage is less than ꢀ V, the supply current increases, which can be calculated by IS = −0.27ꢀ (VCM) + 2.ꢀ.
Rev. A | Page 3 of 16
AD8211
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
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.
Rating
Supply Voltage
Continuous Input Voltage
Reverse Supply Voltage
Differential Input Voltage
HBM (Human Body Model) ESD Rating
CDM (Charged Device Model) ESD Rating
Operating Temperature Range
Storage Temperature Range
Output Short-Circuit Duration
12.5 V
−3 V to +68 V
−0.3 V
500 mV
4000 V
1000 V
−40°C to +125°C
−65°C to +150°C
Indefinite
ESD CAUTION
Rev. A | Page 4 of 16
AD8211
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
OUT
GND
1
2
3
5
4
V+
AD8211
TOP VIEW
1
2
5
(Not to Scale)
V
V
IN–
IN+
NC = NO CONNECT
Figure 3. Pin Configuration
3
4
Figure 2. Metallization Diagram
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
X
Y
Description
Buffered Output.
Ground.
Noninverting Input.
Inverting Input.
Supply.
1
2
3
4
5
OUT
GND
VIN+
VIN−
V+
−277
−140
−228
+229
+264
+466
+466
−519
−519
+466
Rev. A | Page 5 of 16
AD8211
TYPICAL PERFORMANCE CHARACTERISTICS
1.2
1.0
40
30
25
0.8
0.6
20
15
0.4
10
0.2
5
0
0
–5
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
–10
–15
–20
–25
–30
–35
–40
–40
–20
0
20
40
60
80
100
120
10k
100k
FREQUENCY (Hz)
1M
10M
TEMPERATURE (°C)
Figure 4. Typical Offset vs. Temperature
Figure 7. Typical Small Signal Bandwidth (VOUT = 200 mV p-p)
140
10
9
8
7
6
5
4
3
2
1
0
130
120
110
100
90
COMMON-MODE VOLTAGE > 5V
COMMON-MODE VOLTAGE < 5V
80
70
60
10
100
1k
10k
100k
1M
0
5
10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 250
DIFFERENTIAL INPUT VOLTAGE (mV)
FREQUNCY (Hz)
Figure 5. Typical CMRR vs. Frequency
Figure 8. Total Output Error vs. Differential Input Voltage
2500
2000
1500
1000
500
–510
–515
–520
–525
–530
–535
–540
–545
–550
–555
–560
–565
–570
V
IN+
0
–500
–1000
–1500
–2000
–2500
V
IN–
–40
–20
0
20
40
60
80
100
120
0
25
50
75
100 125 150 175 200 225 250
TEMPERATURE (°C)
DIFFERENTIAL INPUT VOLTAGE (mV)
Figure 6. Typical Gain Error vs. Temperature
Figure 9. Input Bias Current vs. Differential Input Voltage,
CM = 0 V
V
Rev. A | Page 6 of 16
AD8211
110
100
90
100mV/DIV
1V/DIV
INPUT
V
V
IN+
80
70
60
OUTPUT
IN–
50
40
0
25
50
75
100 125 150 175 200 225 250
TIME (500ns/DIV)
DIFFERENTIAL INPUT VOLTAGE (mV)
Figure 10. Input Bias Current vs. Differential Input Voltage,
CM = 5 V
Figure 13. Fall Time
V
0.8
0.4
INPUT
0
100mV/DIV
1V/DIV
OUTPUT
–0.4
–0.8
–1.2
–1.6
–2.0
–2.4
–5
0
5
10 15 20 25 30 35 40 45 50 55 60 65
INPUT COMMON-MODE VOLTAGE (V)
TIME (500ns/DIV)
Figure 11. Input Bias Current vs. Input Common-Mode Voltage
Figure 14. Rise Time
4.0
3.5
3.0
2.5
2.0
1.5
1.0
200mV/DIV
INPUT
2V/DIV
OUTPUT
–4
–2
0
2
4
6
8
65
TIME (1µs/DIV)
COMMON-MODE VOLTAGE (V)
Figure 12. Supply Current vs. Common-Mode Voltage
Figure 15. Differential Overload Recovery (Falling)
Rev. A | Page 7 of 16
AD8211
12.0
11.5
11.0
10.5
10.0
9.5
INPUT
200mV/DIV
9.0
8.5
8.0
7.5
OUTPUT
7.0
6.5
2V/DIV
6.0
5.5
5.0
–40 –30 –20 –10
0
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
TEMPERATURE (°C)
TIME (1µs/DIV)
Figure 16. Differential Overload Recovery (Rising)
Figure 19. Maximum Output Sink Current vs. Temperature
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
2V/DIV
0.01/DIV
TIME 5µs/DIV)
–40
–20
0
20
40
60
80
100
120
140
TEMPERATURE (°C)
Figure 20. Maximum Output Source Current vs. Temperature
Figure 17. Settling Time (Falling)
5.0
4.6
4.2
3.8
3.4
3.0
2.6
2.2
1.8
1.4
1.0
2V/DIV
0.01/DIV
TIME 5µs/DIV)
0
1
2
3
4
5
6
7
8
9
OUTPUT SOURCE CURRENT (mA)
Figure 21. Output Voltage Range vs. Output Source Current
Figure 18. Settling Time (Rising)
Rev. A | Page 8 of 16
AD8211
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
2
3
4
5
6
7
8
9
10 11 12
OUTPUT SINK CURRENT (mA)
Figure 22. Output Voltage Range from GND vs. Output Sink Current
Rev. A | Page 9 of 16
AD8211
THEORY OF OPERATION
In typical applications, the AD8211 amplifies a small differential
input voltage generated by the load current flowing through
a shunt resistor. The AD8211 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 23 shows a simplified schematic of the AD8211.
A load current flowing through the external shunt resistor
produces a voltage at the input terminals of the AD8211. The
input terminals are connected to Amplifier A1 by Resistor R
and Resistor R1. The inverting terminal, which has very high
input impedance is held to
(VCM) − (ISHUNT × RSHUNT
)
I
SHUNT
because negligible current flows through Resistor R. Amplifier
A1 forces the noninverting input to the same potential. Therefore,
the current that flows through Resistor R1, is equal to
R
SHUNT
I
IN
R1
R
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
V+
A1
PROPRIETARY
OFFSET
CIRCUITRY
Q1
VOUT = (ISHUNT × RSHUNT) × 20
V
= (I
SHUNT
× R ) × 20
SHUNT
OUT
G = +20
R
OUT
AD8211
GND
Figure 23. Simplified Schematic
Rev. A | Page 10 of 16
AD8211
APPLICATION NOTES
OUTPUT LINEARITY
Regardless of the common mode, the AD8211 provides a
correct output voltage when the input differential is at least
2 mV, which is due to the voltage range of the output amplifier
that can go as low as 33 mV typical. The specified minimum
output amplifier voltage is 100 mV to provide sufficient guard-
bands. The ability of the AD8211 to work with very small
differential inputs, regardless of the common-mode voltage,
allows for more dynamic range, accuracy, and flexibility in any
current sensing application.
In all current sensing applications, and especially in automotive
and industrial environments where the common-mode voltage
can vary significantly, it is important that the current sensor
maintain the specified output linearity, regardless of the input
differential or common-mode voltage. The AD8211 contains
specific circuitry on the input stage, which ensures that even
when the differential input voltage is very small, and the
common-mode voltage is also low (below the 5 V supply),
the input-to-output linearity is maintained. Figure 24 shows
the input differential voltage vs. the corresponding output
voltage at different common modes.
200
180
160
140
120
100
80
60
40
IDEAL V
OUT
(mV)
V
V
(mV) @ V
(mV) @ V
= 0V
= 65V
OUT
OUT
CM
CM
20
0
0
1
2
3
4
5
6
7
8
9
10
DIFFERENTIAL INPUT VOLTAGE (mV)
Figure 24. Gain Linearity Due to Differential and Common-Mode Voltage
Rev. A | Page 11 of 16
AD8211
APPLICATIONS INFORMATION
HIGH-SIDE CURRENT SENSE WITH A LOW-SIDE
SWITCH
OVERCURRENT
DETECTION (<100ns)
5
6
7
8
OUT GND
NC
–IN
In such load control configurations, the PWM-controlled
switch is ground referenced. An inductive load (solenoid) is tied
to a power supply. A resistive shunt is placed between the switch
and the load (see Figure 25). An advantage of placing the shunt on
the high side is that the entire current, including the recirculation
current, can be measured because the shunt remains in the loop
when the switch is off. In addition, diagnostics can be enhanced
because shorts to ground can be detected with the shunt on the
high side. In this circuit configuration, when the switch is
closed, the common-mode voltage moves down to near the
negative rail. When the switch is opened, the voltage reversal
across the inductive load causes the common-mode voltage to
be held one diode drop above the battery by the clamp diode.
AD8214
NC
4
V
+IN
2
V
S
REG
3
1
1
2
3
OUT
GND
V
V
IN+
SHUNT
AD8211
CLAMP
DIODE
V+
5
IN–
4
INDUCTIVE
LOAD
BATTERY
5V
SWITCH
INDUCTIVE
LOAD
1
2
3
CLAMP
DIODE
OUT
GND
V
IN+
SHUNT
AD8211
BATTERY
Figure 26. Battery-Referenced Shunt Resistor
V
V+
5
IN–
4
LOW-SIDE CURRENT SENSING
SWITCH
In systems where low-side current sensing is preferred, the
AD8211 provides an integrated solution with great accuracy.
Ground noise is rejected, CMRR is typically higher than 90 dB,
and output linearity is not compromised, regardless of the input
differential voltage.
5V
Figure 25. Low-Side Switch
HIGH-SIDE CURRENT SENSING
In this configuration, the shunt resistor is referenced to the
battery. High voltage is present at the inputs of the current sense
amplifier. In this mode, the recirculation current is again measured
and shorts to ground can be detected. When the shunt is battery
referenced, the AD8211 produces a linear ground-referenced
analog output. An AD8214 can also be used to provide an over-
current detection signal in as little as 100 ns. This feature is
useful in high current systems where fast shutdown in over-
current conditions is essential.
INDUCTIVE
LOAD
1
2
3
CLAMP
DIODE
OUT
GND
V
IN+
AD8211
SWITCH
BATTERY
V
V+
5
IN–
4
5V
SHUNT
Figure 27. Ground-Referenced Shunt Resistor
Rev. A | Page 12 of 16
AD8211
OUTLINE DIMENSIONS
3.00
2.90
2.80
5
1
4
3
3.00
2.80
2.60
1.70
1.60
1.50
2
0.95 BSC
1.90
BSC
1.30
1.15
0.90
0.20 MAX
0.08 MIN
1.45 MAX
0.95 MIN
0.55
0.45
0.35
0.15 MAX
0.05 MIN
10°
5°
0°
SEATING
PLANE
0.60
BSC
0.50 MAX
0.35 MIN
COMPLIANT TO JEDEC STANDARDS MO-178-AA
Figure 28. 5-Lead Small Outline Transistor Package [SOT-23]
(RJ-5)
Dimensions shown in millimeters
ORDERING GUIDE
Model1, 2
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
5-Lead SOT-23
5-Lead SOT-23
5-Lead SOT-23
5-Lead SOT-23
5-Lead SOT-23
Package Option
Branding
AD8211YRJZ-R2
AD8211YRJZ-RL
AD8211YRJZ-RL7
AD8211WYRJZ-R7
AD8211WYRJZ-RL
RJ-5
RJ-5
RJ-5
RJ-5
RJ-5
Y02
Y02
Y02
Y3N
Y3N
1 Z = RoHS Compliant Part.
2 W = Qualified for Automotive Applications.
AUTOMOTIVE PRODUCTS
The AD8211WYRJZ models are available with controlled manufacturing to support the quality and reliability requirements of automotive
applications. Note that these automotive models may have specifications that differ from the commercial models; therefore, designers
should review the Specifications section of this data sheet carefully. Only the automotive grade products shown are available for use in
automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to
obtain the specific Automotive Reliability reports for these models.
Rev. A | Page 13 of 16
AD8211
NOTES
Rev. A | Page 14 of 16
AD8211
NOTES
Rev. A | Page 15 of 16
AD8211
NOTES
©2007-2011 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06824-0-3/11(A)
Rev. A | Page 16 of 16
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