ANALOG DEVICES AD8215 Service Manual

Current Shunt Monitor

Data Sheet

AD8215

Rev. A

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07203-001

IN+

V+

OUT

G = +20

AD8215

A1

PROPRIETARY

OFFSET

CIRCUITRY

IN–

GND

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

8-Lead SOIC_N: −40°C to +125°C

Excellent ac and dc performance

6 µV/°C typical offset drift

−8 ppm/°C typical gain drift

120 dB typical CMRR at dc

High Voltage,

FUNCTIONAL BLOCK DIAGRAM

APPLICATIONS

High-side current sensing

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

Qualified for automotive applications

GENERAL DESCRIPTION

The AD8215 is a high voltage, precision current shunt monitor. It
features a set gain of 20 V/V, with a maximum ±0.3% 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 AD8215 performs unidirectional current
measurements across a shunt resistor in a variety of industrial
and automotive applications, such as motor controls, solenoid
controls, or battery management.

Figure 1.

Special circuitry is devoted to output linearity being maintained
throughout the input differential voltage range of 0 mV to 250 m V,
regardless of the common-mode voltage present. The AD8215
has an operating temperature range of −40°C to +125°C and is
offered in a small 8-lead SOIC_N package.

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.

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AD8215 Data Sheet

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

10/11—Rev. 0 to Rev. A

Change to Applications Section ...................................................... 1

Updated Outline Dimensions ....................................................... 13

Changes to Ordering Guide .......................................................... 13

Added Automotive Products Section .......................................... 13

1/08—Revision 0: Initial Version

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

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

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

High-Side Current Sensing with a Low-Side Switch ............. 12

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

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

Outline Dimensions ....................................................................... 13

Ordering Guide .......................................................................... 13

Automotive Products ................................................................. 13

Rev. A | Page 2 of 16

Data Sheet AD8215

Drift

−15

+6

+18

µV/°C

T

Output Voltage Range Low

0.03 V

TA

SPECIFICATIONS

T

= −40°C to +125°C, TA = 25°C, 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 ±0.15 % VO ≥ 0.1 V dc, TA
Accuracy Over Temperature ±0.3 % T
Drift 0 −8 −15 ppm/°C T

VOLTAGE OFFSET

Offset Voltage, RTI ±1 mV TA
Over Temperature, RTI ±2.5 mV T

INPUT

Input Impedance

Differential 5 kΩ
Common Mode 5 MΩ Common-mode voltage > 5 V

3.5 kΩ Common-mode voltage < 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 Ratio 100 120 dB T
80 90 dB T

OUTPUT

OPR

OPR

OPR

OPR

, f = dc to 50 kHz, VCM > 5 V

OPR

, f = dc to 40 kHz, VCM < 5 V

OPR

0.10 V T

OPR

Output Voltage Range High 4.95 V TA

4.90 V T

OPR

Output Impedance 2 Ω

DYNAMIC RESPONSE

Small Signal −3 dB Bandwidth 450 kHz T

OPR

Slew Rate 4.5 V/µs TA

NOISE

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

POWER SUPPLY

Operating Range 4.5 5.5 V
Quiescent Current Over Temperature 1.3 2.2 mA VCM > 5 V1, T
Power Supply Rejection Ratio 75 dB T

OPR

TEMPERATURE RANGE

For Specified Performance −40 +125 °C

1

When the input common-mode voltage is less than 5 V, the supply current increases, which can be calculated by IS = −0.275 (VCM) + 2.5.

OPR

Rev. A | Page 3 of 16

AD8215 Data Sheet

Storage Temperature Range

−65°C to +150°C

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage 12.5 V
Continuous Input Voltage −3 V to +68 V
Continuous Differential Input Voltage 0.5 V
Reverse Supply Voltage −0.3 V
Human Body Model (HBM) ESD Rating ±4000 V
Charged Device Model (CDM) ESD Rating ±1000 V
Operating Temperature Range −40°C to +125°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

Data Sheet AD8215

07203-002

5

1

2

5

6

8

–IN

1

GND

2

NC

3

NC

4

+IN

8

NC

7

V+

6

OUT

5

NC = NO CONNECT

AD8215

TOP VIEW

(Not to Scale)

07203-003

6

V+

+273

−266

Supply.

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

Figure 2. Metallization Diagram

Table 3. Pin Function Descriptions

Pin No. Mnemonic X Y Description

1 −IN −228 +519 Inverting Input.
2 GND −273 −251 Ground.
3, 4, 7 NC N/A N/A No Connect.
5 OUT +265 −466 Buffered Output.

8 +IN +229 +519 Noninverting Input.

Figure 3. Pin Configuration

Rev. A | Page 5 of 16