ANALOG DEVICES AD8213 Service Manual

Dual, High Voltage

–

–

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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

10-lead MSOP: −40°C to +125°C

Excellent ac and dc performance

3 μV/°C typical offset drift

−10 ppm/°C typical gain drift

120 dB typical CMRR at dc

APPLICATIONS

High-side current sensing

Motor controls
Transmission controls
Diesel injection controls
Engine management
Suspension controls
Vehicle dynamic controls
DC-to-DC converters

Current Shunt Monitor

AD8213

FUNCTIONAL BLOCK DIAGRAM

OUT2

IN2 +IN2

PROPRIETARY

OFFSET

CIRCUITRY

G = +20

A2

CF2

Figure 1.

A1

PROPRIETARY

OFFSET

CIRCUITRY

CF1GND

IN1+IN1

G = +20

AD8213

V+

OUT1

06639-001

GENERAL DESCRIPTION

The AD8213 is a dual-channel, precision current sense amplifier. It
features a set gain of 20 V/V, with a maximum ±0.5% gain error
over the entire temperature range. The buffered output voltage
directly interfaces with any typical converter. Excellent common­mode rejection from −2 V to +65 V, is independent of the 5 V
supply. The AD8213 performs unidirectional current measure­ments 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
t

hroughout the input differential voltage range of 0 mV to 250 mV,
regardless of the common-mode voltage present. The AD8213
also features additional pins that allow the user to low-pass filter
the input signal before amplifying, via an external capacitor to
ground. The AD8213 has an operating temperature range of

−40ºC to +125ºC and is offered in a small 10-lead MSOP package.

Rev. 0

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: [phone] www.analog.com
Fax: [phone] ©2007 Analog Devices, Inc. All rights reserved.

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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

5/07—Revision 0: Initial Version

Application Notes........................................................................... 11

Output Linearity......................................................................... 11

Low-Pass Filtering...................................................................... 11

Applications Information.............................................................. 12

High-Side Current Sense with a Low-Side Switch................. 12

High-Side Current Sensing....................................................... 12

Low-Side Current Sensing ........................................................ 12

Bidirectional Current Sensing.................................................. 13

Outline Dimensions....................................................................... 14

Ordering Guide .......................................................................... 14

Rev. 0 | Page 2 of 16

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SPECIFICATIONS

T

= operating temperature range, VS = 5 V, RL = 25 kΩ (RL is the output load resistor), unless otherwise noted.

OPR

Table 1.

Parameter Min Typ Max Unit Conditions
GAIN

Initial 20 V/V

Accuracy ±0.25 % VO ≥ 0.1 V dc
Accuracy Over Temperature ±0.5 % T
Gain vs. Temperature 0 −10 −25

VOLTAGE OFFSET

Offset Voltage (RTI) ±1 mV 25°C
Over Temperature (RTI) ±2.2 mV T
Offset Drift ±12

INPUT

Input Impedance

Differential 5 kΩ
Common Mode 5 MΩ V common mode > 5 V

3.5 kΩ V common mode < 5 V
Common-Mode Input Voltage Range −2 +65 V Common mode continuous
Differential Input Voltage Range 250 mV Differential input voltage
Common-Mode Rejection 100 120 dB T
80 90 dB T

OUTPUT

Output Voltage Range Low 0.1 0.05 V
Output Voltage Range High 4.95 4.9 V
Output Impedance 2 Ω

FILTER RESISTOR 18 20 22 kΩ
DYNAMIC RESPONSE

Small Signal −3 dB Bandwidth 500 kHz
Slew Rate 4.5 V/μs

2.7 V/μs

NOISE

0.1 Hz to 10 Hz, RTI 7 μV p-p
Spectral Density, 1 kHz, RTI 70

POWER SUPPLY

Operating Range 4.5 5.5 V
Quiescent Current Over Temperature 2.5 3.75 mA

Power Supply Rejection Ratio 76 dB

TEMPERATURE RANGE

For Specified Performance −40 +125

1

When the input common mode is less than 5 V, the supply current increases. This can be calculated by IS = −0.52(VCM) + 4.9 (see Figure 11).

AD8213

OPR

ppm/°

μV/°

C

nV/√Hz

°C

C

OPR

T

OPR

, f = DC, VCM > 5 V (see Figure 5)

OPR

, f = DC, VCM < 5 V (see Figure 5)

OPR

C

access to resistor for low-pass filter

F

C

= 20 pF, no filter capacitor (CF)

OUT

C

= 20 pF, CF = 20 pF

OUT

> 5 V, per amplifier1, total supply

V

CM

current for two channels

Rev. 0 | Page 3 of 16

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ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage 12.5 V
Continuous Input Voltage −3 V to +68 V
Reverse Supply Voltage −0.3 V
HBM (Human Body Model) ESD Rating ±4000 V
CDM (Charged Device Model) ESD Rating ±1000 V
Operating Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
Output Short-Circuit Duration Indefinite

Stresses above those listed under Absolute Maximum Ratings
ma

y 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

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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

2

38

47

10

9

–IN2

1

+IN2

2

GND

OUT2

CF2

AD8213

3

TOP VIEW

(Not to Scale)

4

5

Figure 3. Pin Configuration

–IN1

10

+IN1

9

V+

8

7

OUT1

CF1

6

06639-003

5

Figure 2. Metallization Diagram

6

06639-002

Table 3. Pin Function Descriptions

Pin No. Mnemonic X Y Description

1 −IN2 −401 677 Inverting input of the second channel.
2 +IN2 −401 510 Noninverting input of the second channel.
3 GND −401 −53 Ground.
4 OUT2 −394 −500 Output of the second channel.
5 CF2 −448 −768 Low-pass filter pin for the second channel.
6 CF1 448 −768 Low-pass filter pin for the first channel.
7 OUT1 394 −500 Output of the first channel.
8 V+ 401 −61 Supply.
9 +IN1 401 510 Noninverting input of the first channel.
10 −IN1 401 677 Inverting input of the first channel.

Rev. 0 | Page 5 of 16