ANALOG DEVICES AD8210 Service Manual
High Voltage, Bidirectional
V
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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
APPLICATIONS
Current sensing
Motor controls
Transmission controls
Diesel injection controls
Engine management
Suspension controls
Vehicle dynamic controls
DC-to-dc converters
Current Shunt Monitor
AD8210
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
I
S
R
S
+IN –IN
GND
Figure 1.
AD8210
V
REF
G=+20
V
REF
V+
V
S
LOAD
1
VOUT
2
05147-001
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
emperature range is −40°C to +125°C.
t
Excellent ac and dc performance over temperature keep errors
in t
he measurement loop to a minimum. Offset drift and gain
drift are guaranteed to a maximum of 8 µV/°C and 20 ppm/°C,
respectively.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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.
The output offset can be adjusted from 0.05 V to 4.9 V with
a 5
V supply by using the V
V
1 pin attached to the V+ pin and the V
REF
1 pin and the V
REF
2 pin. With the
REF
2 pin attached to
REF
the GND pin, the output is set at half scale. Attaching both V
and V
near ground. Attaching both V
2 to GND causes the output to be unipolar, starting
REF
1 and V
REF
2 to V+ causes the
REF
output to be unipolar, starting near V+. Other offsets can be
obtained by applying an external voltage to V
1 and V
REF
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 ©2006–2007 Analog Devices, Inc. All rights reserved.
REF
REF
1
2.
AD8210
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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
REVISION HISTORY
4/07—Rev. 0 to Rev. A
Changes to Features.......................................................................... 1
Changes to Input Section................................................................. 3
Updated Outline Dimensions....................................................... 15
4/06—Revision 0: Initial Version
Modes of Operation ....................................................................... 11
Unidirectional Operation.......................................................... 11
Bidirectional Operation............................................................. 11
Input Filtering ................................................................................. 13
Applications Information.............................................................. 14
High-Side Current Sense with a Low-Side Switch................. 14
High-Side Current Sense with a High-Side Switch ............... 14
H-Bridge Motor Control ........................................................... 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 15
Rev. A | Page 2 of 16
AD8210
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SPECIFICATIONS
TA = operating temperature range, VS = 5 V, unless otherwise noted.
Table 1.
AD8210 SOIC
1
Parameter Min Typ Max Unit Conditions
GAIN
Initial 20 V/V
Accuracy ±0.5 % 25°C, VO ≥ 0.1 V dc
Accuracy Over Temperature ±0.7 % T
A
Gain Drift 20 ppm/°C
VOLTAGE OFFSET
Offset Voltage (RTI) ±1.0 mV 25°C
Over Temperature (RTI) ±1.8 mV T
A
Offset Drift ±8.0 μV/°C
INPUT
Input Impedance
Differential 2 kΩ
Common Mode 5 MΩ V common mode > 5 V
1.5 kΩ V common mode < 5 V
Common-Mode Input Voltage Range −2 +65 V Common mode, continuous
Differential Input Voltage Range 250 mV Differential
2
Common-Mode Rejection 100 120 dB TA, f = dc, VCM > 5 V
80 95 dB TA, f = dc to 100 kHz3, VCM < 5 V
80 dB TA, f = 100 kHz3, VCM > 5 V
80 dB TA, f = 40 kHz3, VCM > 5 V
OUTPUT
Output Voltage Range 0.05 4.9 V RL = 25 kΩ
Output Impedance 2 Ω
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth 450 kHz
Slew Rate 3 V/μs
NOISE
0.1 Hz to 10 Hz, RTI 7 μV p-p
Spectral Density, 1 kHz, RTI 70 nV/√Hz
OFFSET ADJUSTMENT
Ratiometric Accuracy
Accuracy, RTO ±0.6 mV/V Voltage applied to V
4
0.499 0.501 V/V Divider to supplies
REF
1 and V
2 in parallel
REF
Output Offset Adjustment Range 0.05 4.9 V VS = 5 V
V
Input Voltage Range 0.0 V
REF
V
Divider Resistor Values 24 32 40 kΩ
REF
POWER SUPPLY, V
S
S
V
Operating Range 4.5 5.0 5.5 V
Quiescent Current Over Temperature 2 mA VCM > 5 V
5
Power Supply Rejection Ratio 80 dB
TEMPERATURE RANGE
For Specified Performance −40 +125 °C
1
T
to T
MIN
2
Differential input voltage range = ±125 mV with half-scale output offset.
3
Source imbalance < 2 Ω.
4
The offset adjustment is ratiometric to the power supply when V
5
When the input common mode is less than 5 V, the supply current increases. This can be calculated with the following formula: IS = −0.7 (VCM) + 4.2 (see Fi ). gure 21
= −40°C to +125°C.
MAX
1 and V
REF
2 are used as a divider between the supplies.
REF
Rev. A | Page 3 of 16
AD8210
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ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage 12.5 V
Continuous Input Voltage (VCM) −5 V to +68 V
Reverse Supply Voltage 0.3 V
ESD Rating
HBM (Human Body Model) ±4000 V
CDM (Charged Device Model) ±1000 V
Operating Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
Output Short-Circuit Duration Indefinite
S
tresses 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. A | Page 4 of 16
AD8210
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
–IN
1
2
GND
V
2
3
REF
NC
4
NC = NO CONNECT
AD8210
TOP VIEW
(Not to Scale)
+IN
8
7
V
1
REF
V+
6
OUT
5
05147-003
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic X Y
1 −IN −443 +584
2 GND −479 +428
3 V
2 −466 −469
REF
4 NC
5 OUT +466 −537
6 V+ +501 −95
7 V
1 +475 +477
REF
8 +IN +443 +584
1
2
3
Figure 3. Metallization Diagram
8
7
6
5
5147-002
Rev. A | Page 5 of 16
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