Datasheet AD8212 Datasheet (ANALOG DEVICES)

High Voltage
V
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FEATURES

Adjustable gain High common-mode voltage range
7 V to 65 V typical 7 V to >500 V with external pass transistor
Current output
Integrated 5 V series regulator 8-lead MSOP package
Operating temperature range of −40°C to +125°C

APPLICATIONS

Current shunt measurement Motor controls
DC-to-DC converters
Power supplies Battery monitoring
Remote sensing
Current Shunt Monitor
AD8212

FUNCTIONAL BLOCK DIAGRAM

V+
1
AD8212
BIAS
CIRCUIT
COM BIAS ALPHA
I
OUT
Figure 1.
SENSE
8
OUTPUT
CURRENT
COMPENSATI ON
6325
05942-001

GENERAL DESCRIPTION

The AD8212 is a high common-mode voltage, current shunt monitor. It accurately amplifies a small differential input voltage in the presence of large common-mode voltages up to 65 V (>500 V with an external PNP transistor).
The AD8212 is ideal for current monitoring across a shunt r
esistor in applications controlling loads, such as motors and solenoids. The current output of the device is proportional to the input differential voltage. The user can select an external resistor to set the desired gain. The typical common-mode voltage range of the AD8212 is 7 V to 65 V.
Another feature of the AD8212 is high voltage operation,
ich is achieved by using an external high voltage breakdown
wh PNP transistor. In this configuration, the common-mode range of the AD8212 is equal to the breakdown of the external PNP transistor. Therefore, operation at several hundred volts is easily achieved (see
Figure 23).
The AD8212 features a patented output base current compensa­t
ion circuit for high voltage operation mode. This ensures that no base current is lost through the external transistor and excellent output accuracy is maintained regardless of common­mode voltage or temperature.
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.
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.
AD8212
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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 ........................................................................ 9

REVISION HISTORY

11/07—Rev. 0 to Rev. A
Increased Operating Temperature Range........................Universal
5/07—Revision 0: Initial Version
Normal Operation (7 V to 65 V Supply (V+) Range)..............9
High Voltage Operation Using an External PNP Transistor 10
Output Current Compensation Circuit................................... 10
Applications Information.............................................................. 11
General High-Side Current Sensing........................................ 11
Motor Control............................................................................. 11
500 V Current Monitor ............................................................. 11
Bidirectional Current Sensing.................................................. 12
Outline Dimensions....................................................................... 13
Ordering Guide .......................................................................... 13
Rev. A | Page 2 of 16
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SPECIFICATIONS

VS = 15 V, T
Table 1.
Parameter Conditions/Comments Min Typ Max Unit
SUPPLY VOLTAGE (V+) No external pass transistor 7 65 V With external PNP transistor SUPPLY CURRENT2 (I V+ = 7 V to 65 V 220 720 μA High voltage operation, using external PNP 200 1500 μA VOLTAGE OFFSET
Offset Voltage (RTI) TA ±2 mV Over Temperature (RTI) T Offset Drift T
INPUT
Input Impedance
Differential 2 kΩ Common Mode (VCM) V+ = 7 V to 65 V 5
Voltage Range
Differential Maximum voltage between V+ and V
V
SENSE
OUTPUT
Transconductance 1000 μA/V Current Range (I Gain Error for T Impedance 20 MΩ Voltage Range 0 V+ − 5 V
REGULATOR
Nominal Value 7 V ≤ V+ ≤ 65 V 4.80 5 5.20 V PSRR 7 V ≤ V+ ≤ 65 V 80 dB Bias Current (I
T
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth Gain = 10 1000 kHz Gain = 20 500 kHz Gain = 50 100 kHz
Settling Time Within 0.1% of the true output, gain = 20 2 μs ALPHA PIN INPUT CURRENT 25 μA NOISE
0.1 Hz to 10 Hz, RTI 1.1 μV p-p
Spectral Density, 1 kHz, RTI 40 TEMPERATURE RANGE
For Specified Performance (T
1
Range dependent on the VCE breakdown of the transistor.
2
The AD8212 supply current in normal voltage operation (V+ = 7 V to 65 V) is the bias current (I
differential voltage and can range from 0 μA to 500 μA. I to the High Voltage Operation Using an External PNP Transistor section.
3
The current of the amplifier into V
for more information.
= −40°C to +125°C, TA = 25°C, unless otherwise noted.
OPR
= I
+ I
OUT
, 7 V ≤ V+ ≤ 65 V 185 200 μA
, high voltage operation 200 1000 μA
in this mode of operation is typically 185 μA and 200 μA maximum. For high voltage operation mode, refer
BIAS
(Pin 8) Current
OUT
7 V ≤ V+ ≤ 65 V, with respect to 500 μA full scale ±1 %
OPR
) T
BIAS
SUPPLY
OPR
OPR
3
V+ = 7 V to 65 V, T
) 7 V ≤ V+ ≤ 65 V, 0 mV to 500 mV differential input 500 μA
OPR
OPR
) −40 +125 °C
OPR
(Pin 8) increases when operating in high voltage mode. See the High Voltage Operation Using an External PNP Transistor section
SENSE
1
)
BIAS
7 >500 V
±3 mV ±10 μV/°C
SENSE
100 200 nA
OPR
500 mV
nV/Hz
) added to output current (I
BIAS
). Output current varies upon input
OUT
Rev. A | Page 3 of 16
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ABSOLUTE MAXIMUM RATINGS

T
= −40°C to +125°C, unless otherwise noted.
OPR
Table 2.
Parameter Rating
Supply Voltage 65 V Continuous Input Voltage 68 V Reverse Supply Voltage 0.3 V Operating Temperature Range −40°C to +125°C Storage Temperature Range −40°C to +150°C Output Short-Circuit Duration 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. A | Page 4 of 16
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

V+ 1
AD8212
2
COM
3
BIAS
TOP VIEW
(Not to Scale)
NC 4
NC = NO CONNECT
Figure 2. Pin Configuration
8
7
6
5
V
SENSE
NC
ALPHA
I
OUT
1
2
3
05942-002
Figure 3. Metallization Diagram
Table 3. Pin Function Descriptions
Pin No. Mnemonic X Coordinate Y Coordinate Description
1 V+ −393 +219 Supply Voltage (Inverting Amplifier Input). 2 COM −392 +67 Regulator Low Side. 3 BIAS −392 −145 4 NC – – 5 I
+386 −82 Output Current.
OUT
6 ALPHA +386 +23 7 NC +386 +118 8 V
+386 +210 Noninverting Amplifier Input.
SENSE
Bias Circuit Low Side. No Connect.
Current Compensation Circuit Input. No Connect.
8
6
5
05942-025
Rev. A | Page 5 of 16
AD8212
V
(
V
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TYPICAL PERFORMANCE CHARACTERISTICS

195
1200
190
T = +125°C
185
180
175
170
QUIESCENT CURRENT (µA)
165
160
5.2
5.1
5.0
4.9
REGULATOR VOLTAGE (V)
4.8
T = +25°C
5 101520 2530 35404550556065
SUPPLY VOLTAGE (V)
Figure 4. Supply Current vs. Supply (Pin V+) (I
T = +25°C
T = +125°C
5 101520 2530 35404550556065
SUPPLY VOLTAGE (V)
T = –40°C
OUT
T = –40°C
Figure 5. Regulator Voltage vs. Supply (Pin V+)
= 0 mA)
1000
800
) µ
OS
600
INPUT
400
200
05942-005
0 –40 –20 0 20 40 60 80 100 120
TEMPERATURE ( °C)
05942-008
Figure 7. Input Offset Voltage vs. Temperature
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
OFFSET VO LTAGE RTI (mV )
0.2
0.1
05942-006
+125°C
+25°C
–40°C
0
7 1217222732374247525762
VOLTAGE SUPPLY (V)
05942-009
Figure 8 .Input Offset Voltage vs. Supply (Pin V+)
50
45
40
35
30
25
GAIN (dB)
20
15
10
5
0
1k 10k 100k 1M 10M
G = +50
G = +20
G = +10
FREQUENCY (Hz)
Figure 6. Gain vs. Frequency
5942-021
10
9
8
7
6
5
4
3
2
OUTPUT CURRENT DRIFT (nA/ °C)
1
0
0 50 100 150 200 250 300 350 400 450 500
DIFFERENTIAL INPUT VOLTAGE (mV)
Figure 9. Output Current Drift vs. Differential Input Voltage
Rev. A | Page 6 of 16
05942-010
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100
V
IN
20mV/DIV
10
V+ = 15V
= 50k
R
1
OUTPUT ERRO R (%)
0.1
G = +10
G = +20
G = +50
V
OUT
500mV/DIV
0V
OUT
0.01 0 10203040 60 80 10050 70 90 500
DIFFERENTIAL INPUT VOLTAGE (mV)
Figure 10. Total Output Error Due to
Input Offset vs. Differential
Input Voltage
V
IN
20mV/DIV
V+ = 15V
= 5k
R
OUT
V
OUT
50mV/DIV
0V
5µs/DIV
Figure 11. Step Response (Gain = 5)
5µs/DIV
05942-023
05942-014
Figure 13. Step Response (Gain = 50)
V
IN
100mV/DIV
V+ = 15V
R
= 5k
OUT
V
OUT
200mV/DIV
05942-012
5µs/DIV
05942-015
Figure 14. Step Response (Gain = 5)
V
IN
20mV/DIV
V
OUT
200mV/DIV
0V
V+ = 15V
R
OUT
5µs/DIV
Figure 12. Step Response (Gain = 20)
= 20k
05942-013
V
IN
100mV/DIV
V
OUT
1V/DIV
0V
Figure 15. Step Response (Gain = 20)
Rev. A | Page 7 of 16
5µs/DIV
V+ = 15V
R
OUT
= 20k
05942-016
AD8212
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V
100mV/DIV
0V
IN
V
OUT
2V/DIV
V+ = 15V
R
OUT
= 50k
5.2
5.1
5.0
4.9
REGULATOR VOLTAGE (V)
T = –40°C
T = +25°C
T = +125°C
5µs/DIV
Figure 16. Step Response (Gain = 50)
05942-017
4.8 100 200 300 400 500 600 700 800 900 1000 1100 1200
BIAS CURRENT (µA)
Figure 19. Regulator Voltage High Voltage Mode (I
= 0 mA) vs.
OUT
5942-024
Bias Current
5.2
V
IN
100mV/DIV
5.1
V+ = 300V
V+ = 15V
R
= 20k
OUT
V
OUT
2V/DIV
0V
2µs/DIV
05942-018
Figure 17. Step Response Falling
V
IN
100mV/DIV
V+ = 15V
R
= 20k
OUT
V
OUT
2µs/DIV
2V/DIV
05942-019
0V
Figure 18. Step Response Rising
5.0
V+ = 200V
4.9
REGULATOR VOLTAGE (V)
4.8 –40 –25 –10 5 20 35 50 65 8 0 95 110 125
TEMPERATURE ( °C)
Figure 20. Regulator Voltage vs. Temperature
(
High Voltage Operation)
550
500
450
400
350
300
250
200
V+ MAXIMUM RANGE
150
V+ MINIMUM RANG E
V+ OPERATING RANGE (V)
100
50
0
10 20 30 50 70 100 150 200 250 300 350 400 450 500
R
Figure 21. Supply Range (V+) vs. Bias Resistor Value
(
High Voltage Operation)
BIAS
(k)
V+ = 100V
05942-007
05942-020
Rev. A | Page 8 of 16
AD8212
V
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THEORY OF OPERATION

NORMAL OPERATION (7 V TO 65 V SUPPLY (V+) RANGE)

In typical applications, the AD8212 measures a small differential input voltage generated by a load current flowing through a shunt resistor.
The operational amplifier (A1) is connected across the shunt
sistor (R
re battery/supply side, and the noninverting input connected to the load side of the system. Amplifier A1 is powered via an internal series regulator (depicted as a Zener diode in Figure 22). This regulator maintains a constant 5 V between th
e battery/supply terminal of the AD8212 and COM (Pin 2), which represents the lowest common point of the internal circuitry.
A load current flowing through the external shunt resistor p
roduces a voltage at the input terminals of the AD8212. Amplifier A1 responds by causing Transistor Q1 to conduct the necessary current through Resistor R1 to equalize the potential at both the inverting and noninverting inputs of Amplifier A1.
The current through the emitter of Transistor Q1 (I proportional to the input voltage (V load current (I output current (I external resistor, the value of which is dependent on the input to output gain equation desired in the application.
The transfer function for the AD8212 is
I
OUT
V
SENSE
V
OUT
V
OUT
where:
= 1000 µA/V.
g
m
In normal voltage operation mode, the bias circuit is connected t
o GND, as shown in
185 μA throughout the 7 V to 65 V (V+) range.
) with its inverting input connected to the
SHUNT
), and, therefore, the
SENSE
) through the shunt resistor (R
LOAD
) is converted to a voltage by using an
OUT
= (gm × V
= I
LOAD
= I
OUT
= (V
× R
SENSE
SENSE
× R
× R
OUT
)
SHUNT
OUT
)/1000
Figure 22. In this mode, I
OUT
SHUNT
is typically
BIAS
) is
). The
I
BATTERY
1
R1 R2
Q1
OUT
R
Figure 22. Typical Connection (7 V to 65 V Supply (Pin V+) Range)
OUT
I
OUT
R
AD8212
BIAS
CIRCUIT
SHUNT
A1
LOAD
8
OUTPUT
CURRENT
COMPENSATION
6325
LOAD
05942-003
When using the AD8212 as described, the battery/supply voltage in the system must be between 7 V to 65 V. The 7 V minimum supply range is necessary to turn on the internal regulator (shown as a Zener diode in
ltage then remains a constant 5 V, regardless of the supply
vo
Figure 22). This regulated
(V+) voltage. The 65 V maximum limit in this mode of operation is due to the breakdown voltage limitation of the AD8212 process.
Typically, a 1% resistor can be used to convert the output
urrent to a voltage. Ta b le 4 provides suggested R
c
Table 4. Suggested R
Gain (V/V) R
Values
OUT
OUT
(kΩ)
values.
OUT
1 1 10 10 20 50
20
49.9
100 100
Rev. A | Page 9 of 16
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HIGH VOLTAGE OPERATION USING AN EXTERNAL PNP TRANSISTOR

The AD8212 offers features that simplify measuring current in the presence of common-mode voltages greater than 65 V. This is achieved by connecting an external PNP transistor at the output of the AD8212, as shown in Figure 23. The V down voltage of this PNP becomes the operating common-mode range of the AD8212. PNP transistors with breakdown voltages exceeding 300 V are inexpensive and readily available in small packages.
BATTERY
1
R1 R2
Q1
Q2
VOUT
R
OUT
Figure 23. High Voltage Operation Using External PNP
R
AD8212
BIAS
CIRCUIT
R
SHUNT
A1
BIAS
8
OUTPUT
CURRENT
COMPENSATI ON
6325
The AD8212 features an integrated 5 V series regulator. This regulator ensures that at all times COM (Pin 2), which is the most negative of all the terminals, is always 5 V less than the supply voltage (V+). Assuming a battery voltage (V+) of 100 V, it follows that the voltage at COM (Pin 2) is
(V+) – 5 V = 95
V
The base emitter junction of Transistor Q2, in addition to the V
of one internal transistor, makes the collector of Transistor Q1
be
approximately equal to
95 V + 2(V
) = 95 V + 1.2 V = 96.2 V
be(Q2)
This voltage appears across external Transistor Q2. The voltage
ross Transistor Q1 is
ac
100 V – 96.2 V = 3.8 V
In this manner, Transistor Q2 withstands 95.6 V and the
nternal Transistor Q1 is only subjected to voltages well below
i its breakdown capability.
break-
CE
LOAD
05942-004
In this mode of operation, the supply current (I
BIAS
) of the AD8212 circuit increases based on the supply range and the R
resistor chosen. For example
BIAS
if
V+ = 500 V and R
= (V+ − 5 V)/R
I
BIAS
= 500 kΩ
BIAS
BIAS
then,
I
= (500 – 5)/500 kΩ = 990 μA
BIAS
In high voltage operation, it is recommended that I
remain
BIAS
within 200 μA to 1 mA. This ensures that the bias circuit is turned on, allowing the device to function as expected. At the same time, the current through the bias circuit/regulator is limited to 1 mA. Refer to Figure 19 and Figure 21 for I
BIAS
and V+ information when using the AD8212 in a high voltage configuration.
When operating the AD8212, as depicted in Figure 23,
ransistor Q2 can be a FET or a bipolar PNP transistor. The
T latter is much less expensive, however the magnitude of I conducted to the output resistor (R
) is reduced by the
OUT
OUT
amount of current lost through the base of the PNP. This leads to an error in the output voltage reading.
The AD8212 includes an integrated patented circuit, which
mpensates for the output current that is lost through the base
co of the external PNP transistor. This ensures that the correct transconductance of the amplifier is maintained. The user can opt for an inexpensive bipolar PNP, instead of a FET, while maintaining a comparable level of accuracy.

OUTPUT CURRENT COMPENSATION CIRCUIT

The base of the external PNP, Q2, is connected to ALPHA (Pin 6) of the AD8212. The current flowing in this path is mirrored inside the current compensation circuit. This current then flows in Resistor R2, which is the same value as Resistor R1. The voltage created by this current across Resistor R2, displaces the noninverting input of Amplifier A1 by the corresponding voltage. Amplifier A1 responds by driving the base of Transistor Q1 so as to force a similar voltage displacement across Resistor R1, thereby increasing I
Because the current generated by the output compensation
cuit is equal to the base current of Transistor Q2, and the
cir resulting displacements across Resistor R1 and Resistor R2 result in equal currents, the increment of current added to the output current is equivalent to the base current of Transistor Q2. Therefore, the integrated output current compensation circuit has corrected I
such that no error results from the base
OUT
current lost at Transistor Q2.
This feature of the AD8212 greatly improves I
OUT
allows the user to choose an inexpensive bipolar PNP (with low beta) with which to monitor current in the presence of high voltages (typically several hundred volts).
.
OUT
accuracy and
Rev. A | Page 10 of 16
AD8212
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APPLICATIONS INFORMATION

GENERAL HIGH-SIDE CURRENT SENSING

The AD8212 output is intended to drive high impedance nodes. Therefore, if interfacing with a converter, it is recommended that the output voltage across R of the AD8212 is not affected.
I
LOAD
BATTERY
R
SHUNT
AD8212
V+
1
V
8
SENSE
COM
2
BIAS
3
NC
4
NOTES
1. NC = NO CONNECT.
NC
ALPHA
I
OUT
7
6
5
Figure 24. Normal Voltage Range Operation
Careful calculations must be made when choosing a gain resistor so as not to exceed the input voltage range of the converter. The output of the AD8212 can be as high as (V+) − 5 V. However, the true output maximum voltage is dependent upon the differential input voltage, and the resulting output current across R
, which can be as high as 500 μA
OUT
(based on a 500 mV maximum input differential limit).
be buffered, so that the gain
OUT
LOAD
AD8661
I
R
OUT
OUT
ADC
05942-026

500 V CURRENT MONITOR

As noted in the High Voltage Operation Using an External PNP Tr an si st o r section, the AD8212 common-mode voltage range is
tended by using an external PNP transistor. This mode of
ex operation is achievable with many amplifiers featuring a current output. However, typically an external Zener regulator must be added, along with a FET device, to withstand the common-mode voltage and maintain output current accuracy.
The AD8212 features an integrated regulator (which acts as a Z
ener regulator). It offers output current compensation that allows the user to maintain excellent output current accuracy by using any PNP transistor. Reliability is increased due to lower component count. Most importantly, the output current accuracy is high, allowing the user to choose an inexpensive PNP transistor to withstand the increased common-mode voltage.
I
LOAD
500V
3
4
500k
R
SHUNT
AD8212
V+1
COM2
BIAS
NC
V
SENSE
NC
ALPHA
I
OUT
LOAD
8
7
6
5
VOUT
R
OUT

MOTOR CONTROL

The AD8212 is a practical solution for high-side current sensing in motor control applications. In cases where the shunt resistor is referenced to battery and the current flowing is unidirectional, as shown in Figure 25, the AD8212 monitors the current with no
additional supply pin necessary.
BATTERY
AD8212
V+
1
V
8
SENSE
COM
2
BIAS
3
NC
4
NOTES
1. NC = NO CONNECT.
NC
ALPHA
I
OUT
7
6
5
R
OUT
Figure 25. High-Side Current Sensing for Motor Control
I
MOTOR
V
OUT
MOTOR
05942-028
NOTES
1. TRANSIST OR V VOLTAG E MUST BE 500V.
2. NC = NO CONNECT.
BREAKDOWN
CE
05942-027
Figure 26. High Voltage Operation Using External PNP
Rev. A | Page 11 of 16
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BIDIRECTIONAL CURRENT SENSING

The AD8212 is a unidirectional current sensing device. Therefore, in power management applications where both the charge and load currents must be monitored, two devices can be used and connected as shown in
Figure 27. In this case,
I
LOAD
I
CHARGE
R
SHUNT
V
1 increases as I
OUT
increases when I
flows through the shunt resistor. V
LOAD
flows through the input shunt resistor.
CHARGE
OUT
2
V
SENSE
1 1
BATTERY
I
OUT
R
1
OUT
AD8212
BIAS
CIRCUIT
COM BIAS ALPHA I
8 8
OUTPUT
CURRENT
COMPENSATION
6325
V
1
OUT
V
SENSE
OUTPUT
CURRENT
COMPENSATIO N
6 3 2
AD8212
BIAS
CIRCUIT
V+V+
LOAD
CHARGE
COMBIASALPHA
OUT
5
V
2
R
OUT
OUT
2
5942-011
Figure 27. Bidirectional Current Sensing
Rev. A | Page 12 of 16
AD8212
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OUTLINE DIMENSIONS

3.20
3.00
2.80
8
5
3.20
3.00
1
2.80
PIN 1
0.65 BSC
0.95
0.85
0.75
0.15
0.38
0.00
0.22
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-AA
Figure 28. 8-Lead Mini Small Outline Package [MSOP]

ORDERING GUIDE

Model Temperature Range Package Description Package Option Branding
AD8212YRMZ AD8212YRMZ-RL AD8212YRMZ-R7
1
Z = RoHS Compliant Part.
1
1
1
−40°C to +125°C 8-Lead MSOP RM-8 Y04
−40°C to +125°C 8-Lead MSOP, 13” Tape and Reel RM-8 Y04
−40°C to +125°C 8-Lead MSOP, 7” Tape and Reel RM-8 Y04
5.15
4.90
4.65
4
1.10 MAX
0.23
SEATING PLANE
0.08
(RM-8)
Dim
ensions shown in millimeters
8° 0°
0.80
0.60
0.40
Rev. A | Page 13 of 16
AD8212
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NOTES
Rev. A | Page 14 of 16
AD8212
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NOTES
Rev. A | Page 15 of 16
AD8212
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NOTES
©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05942-0-11/07(A)
Rev. A | Page 16 of 16
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