High Voltage,
Current Shunt Monitor
AD8215
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAM
IN+
±4000 V human body model (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: −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
Qualified for automotive applications
IN–
V+
A1
PROPRIETARY
OFFSET
CIRCUITRY
OUT
AD8215
APPLICATIONS
GND
07203-001
G = +20
Figure 1.
High-side current sensing
Motor controls
Transmission controls
Engine management
Suspension controls
Vehicle dynamic controls
DC to dc converters
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
common-mode 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.
Rev. B
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 AD8215
has an operating temperature range of −40°C to +125°C and is
offered in a small 8-lead SOIC package.
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AD8215
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Application Notes ........................................................................... 11
Applications ....................................................................................... 1
Output Linearity ......................................................................... 11
Functional Block Diagram .............................................................. 1
Applications Information .............................................................. 12
General Description ......................................................................... 1
High-Side Current Sensing with a Low-Side Switch ............. 12
Revision History ............................................................................... 2
High-Side Current Sensing ....................................................... 12
Specifications..................................................................................... 3
Low-Side Current Sensing ........................................................ 12
Absolute Maximum Ratings............................................................ 4
Outline Dimensions ....................................................................... 13
ESD Caution .................................................................................. 4
Ordering Guide .......................................................................... 13
Pin Configuration and Function Descriptions ............................. 5
Automotive Products ................................................................. 13
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 10
REVISION HISTORY
12/2016—Rev. A to Rev. B
Changes to Features Section and Applications Section ............... 1
Changes to Figure 30 ...................................................................... 12
10/2011—Rev. 0 to Rev. A
Change to Applications Section ...................................................... 1
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 13
Added Automotive Products Section .......................................... 13
1/2008—Revision 0: Initial Version
Rev. B | Page 2 of 13
Data Sheet
AD8215
SPECIFICATIONS
Operating temperature range (TOPR) = −40°C to +125°C, ambient temperature (TA) = 25°C, VS = 5 V, RL = 25 kΩ (RL is the output load
resistor), unless otherwise noted.
Table 1.
Parameter
GAIN
Initial
Accuracy
Accuracy Over Temperature
Drift
VOLTAGE OFFSET
Offset Voltage, Referred to Input (RTI)
Over Temperature (RTI)
Drift
INPUT
Input Impedance
Differential
Common Mode
Common-Mode Input Voltage Range
Differential Input Voltage Range
Common-Mode Rejection Ratio
Min
Typ
Max
Unit
Test Conditions/Comments
−8
±0.15
±0.3
−15
V/V
%
%
ppm/°C
Output voltage (VO) ≥ 0.1 V dc, TA
TOPR
TOPR
+6
±1
±2.5
+18
mV
mV
µV/°C
TA
TOPR
TOPR
+65
kΩ
MΩ
kΩ
V
mV
dB
dB
Common-mode voltage > 5 V
Common-mode voltage < 5 V
Common-mode continuous
Differential input voltage
TOPR, f = dc to 50 kHz, VCM > 5 V
TOPR, f = dc to 40 kHz, VCM < 5 V
20
0
−15
5
5
3.5
−2
100
80
OUTPUT
Output Voltage Range Low
250
120
90
0.03
TA
TOPR
TA
TOPR
2
V
V
V
V
Ω
450
4.5
kHz
V/µs
TOPR
TA
7
70
µV p-p
nV/√Hz
0.10
Output Voltage Range High
4.95
4.90
Output Impedance
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
Slew Rate
NOISE
0.1 Hz to 10 Hz, RTI
Spectral Density, 1 kHz, RTI
POWER SUPPLY
Operating Range
Quiescent Current Over Temperature
Power Supply Rejection Ratio
TEMPERATURE RANGE
For Specified Performance
1
4.5
1.3
5.5
2.2
V
mA
dB
+125
°C
75
−40
VCM > 5 V 1, TOPR
TOPR
When the common-mode input voltage is less than 5 V, the supply current increases, which can be calculated by IS = −0.275 (VCM) + 2.5.
Rev. B | Page 3 of 13
AD8215
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Continuous Input Voltage (Survival)
Continuous Differential Input Voltage
Reverse Supply Voltage
ESD Rating
HBM
Charged Device Model (CDM)
Operating Temperature Range
Storage Temperature Range
Output Short-Circuit Duration
ESD CAUTION
Rating
12.5 V
−3 V to +68 V
0.5 V
−0.3 V
±4000 V
±1000 V
−40°C to +125°C
−65°C to +150°C
Indefinite
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
Rev. B | Page 4 of 13
Data Sheet
AD8215
1
8
–IN 1
GND 2
NC 3
6
55
TOP VIEW
NC 4 (Not to Scale)
07203-002
2
AD8215
8
+IN
7
NC
6
V+
5
OUT
NC = NO CONNECT
Figure 2. Metallization Diagram
07203-003
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
1
2
3, 4, 7
5
6
8
Mnemonic
−IN
GND
NC
OUT
V+
+IN
X
−228
−273
Not applicable
+265
+273
+229
Y
+519
−251
Not applicable
−466
−266
+519
Rev. B | Page 5 of 13
Description
Inverting Input
Ground
No Connect
Buffered Output
Supply
Noninverting Input
AD8215
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
1.2
40
1.0
35
30
0.8
25
0.6
20
15
0.4
GAIN (dB)
VOSI (mV)
10
0.2
0
–0.2
5
0
–5
–0.4
–10
–15
–0.6
–20
–0.8
–25
–30
–1.0
0
20
40
60
80
100
120
TEMPERATURE (°C)
–40
10k
07203-017
–20
1M
10M
FREQUENCY (Hz)
Figure 4. Typical Offset Drift (VOSI) vs. Temperature
Figure 7. Typical Small Signal Bandwidth (VOUT = 200 mV p-p)
140
10
9
130
TOTAL OUTPUT ERROR (%)
COMMON-MODE VOLTAGE >5V
120
CMRR (dB)
100k
07203-018
–35
–1.2
–40
110
COMMON-MODE VOLTAGE
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