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® INA138
INA168
For most current data sheet and other product
information, visit www.burr-brown.com
High-Side Measurement
CURRENT SHUNT MONITOR
FEATURES
q COMPLETE UNIPOLAR HIGH-SIDE
CURRENT MEASUREMENT CIRCUIT
q WIDE SUPPLY AND COMMON-MODE
RANGE
q INA138: 2.7V to 36V
q INA168: 2.7V to 60V
q INDEPENDENT SUPPLY AND INPUT
COMMON-MODE VOLTAGES
q SINGLE RESISTOR GAIN SET
q LOW QUIESCENT CURRENT (25µA typ)
q SOT23-5 Package
APPLICATIONS
q CURRENT SHUNT MEASUREMENT
Automotive, Telephone, Computers
q PORTABLE & BATTERY BACKUP
SYSTEMS
q BATTERY CHARGERS
q POWER MANAGEMENT
q CELL PHONES
q PRECISION CURRENT SOURCE
DESCRIPTION
The INA138 and INA168 are high-side, unipolar,
current shunt monitors. Wide input common-mode
voltage range, low quiescent current, and tiny SOT-23
packaging enable use in a variety of applications.
Input common-mode and power supply voltages are
independent and can range from 2.7V to 36V for the
INA138 and 2.7V to 60V for the INA168. Both
models draw only 25µA quiescent current, which also
permits connecting the power supply to either side of
the current measurement shunt with minimal error.
The device converts a differential input voltage to a
current output. This current is converted back to a
voltage with an external load resistor that sets any
gain from 1 to over 100. Although designed for
current shunt measurement, the circuit invites creative
applications in measurement and level shifting.
Both the INA138 and INA168 are available in
SOT23-5 and are specified for the –40°C to +85°C
industrial temperature range.
VIN+
RS IS
3
VIN+
4
VIN–
Load
5k
V+
5
5k
GND
2
OUT
1
VO = ISRSRL/5k
RL
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1999 Burr-Brown Corporation
PDS-1576A
Printed in U.S.A. December, 1999

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SPECIFICATIONS
At TA = –40°C to +85°C, VS = 5V, VIN+ = 12V, ROUT = 125k, unless otherwise noted.
PARAMETER
CONDITION
MIN
INPUT
Full-Scale Sense Voltage
Common-Mode Input Range
Common-Mode Rejection
Offset Voltage(1)
vs Temperature
vs Power Supply
Input Bias Current
OUTPUT
Transconductance
vs Temperature
Nonlinearity Error
Total Output Error
Output Impedance
Voltage Output
Swing to Power Supply, V+
Swing to Common Mode, VCM
FREQUENCY RESPONSE
Bandwidth
Settling Time (0.1%)
NOISE
Output-Current Noise Density
Total Output-Current Noise
VSENSE = VI+N – VI–N
VIN+ = 2.7V to 40V, VSENSE = 50mV
VIN+ = 2.7V to 60V, VSENSE = 50mV
TMIN to TMAX
V– = 2.7V to 40V, VSENSE = 50mV
V– = 2.7V to 60V, VSENSE = 50mV
VI+N, VI–N
2.7
100
VSENSE = 10mV – 150mV
VSENSE = 100mV
VSENSE = 10mV to 150mV
VSENSE = 100mV
198
ROUT = 5k
ROUT = 125k
5V Step, ROUT = 5k
5V Step, ROUT = 125k
BW = 100kHz
POWER SUPPLY
Operating Range, V+
Quiescent Current
VSENSE = 0, IO = 0
TEMPERATURE RANGE
Specification, TMIN to TMAX
Operating
Storage
Thermal Resistance
θJA
2.7
–40
–55
–65
NOTES: (1) Defined as the amount of input voltage, VSENSE, to drive the output to zero.
INA138
TYP
MAX
100 500
36
120
±0.2 ±1
1
0.1 10
2
200
10
±0.01
±0.5
1 || 5
202
±0.1
±2
(V+) – 0.8 (V+) – 1.0
VCM – 0.5 VCM – 0.8
800
32
1.8
30
9
3
36
25 45
85
125
150
200
MIN
V
100
V
V
V
V
V
INA168
TYP
MAX
VV
60
120
VV
V
0.1 10
V
UNITS
mV
V
dB
dB
mV
µV/°C
µV/V
µV/V
uA
V V µA/V
V nA/°C
VV
%
VV
%
V G|| pF
VV
VV
V
V
V kHz
V kHz
V µs
V µs
V pA/Hz
V nA RMS
60 V
V V µA
V °C
V °C
V °C
V °C/W
®
INA138, INA168
2

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PIN CONFIGURATION
TOP VIEW
OUT 1
GND 2
VI+N 3
5 V+
4 VI–N
SOT
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, V+
INA138 ............................................................................... –0.3V to 60V
INA168 ............................................................................... –0.3V to 60V
Analog Inputs, VI+N, VI–N
INA138
Common Mode ............................................................... –0.3V to 40V
Differential (VI+N) – (VI–N) ..................................................... –40V to 2V
INA168
Common Mode ............................................................... –0.3V to 60V
Differential (VI+N) – (VI–N) ..................................................... –40V to 2V
Analog Output, Out .............................................................. –0.3V to 40V
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ..................................................... –55°C to +125°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those specified is not implied.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION
PRODUCT
INA138NA
"
INA168NA(2)
"
PACKAGE
SOT-23-5 Surface Mount
"
SOT-23-5 Surface Mount
"
PACKAGE
DRAWING
NUMBER
331
"
331
"
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
"
–40°C to +85°C
"
PACKAGE
MARKING
"
"
ORDERING
NUMBER(1)
INA138NA/250
INA138NA/3K
INA168NA/250
INA168NA/3K
TRANSPORT
MEDIA
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /3K indicates 3000 devices per reel). Ordering 3000 pieces
of “INA138NA/3K” will get a single 3000-piece Tape and Reel. (2) INA168 available Q2'00.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
3 INA138, INA168

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TYPICAL PERFORMANCE CURVES
At TA = +25°C, V+ = 5V, VI+N = 12V, RL = 125k, unless otherwise noted.
GAIN vs FREQUENCY
40
RL = 500k
30
RL = 50k
20
10
RL = 5k
0
–10
–20
100
CL = 10nF CL = 1nF CL = 100pF
1k 10k 100k 1M 10M
Frequency (Hz)
COMMON-MODE REJECTION vs FREQUENCY
120
100 G = 100
80
G = 10
60
G=1
40
20
0
0.1
1
10 100 1k
Frequency (Hz)
10k 100k
POWER-SUPPLY REJECTION vs FREQUENCY
140
120
G = 100
100
G = 10
80
G=1
60
40
20
1
10 100 1k
Frequency (Hz)
10k 100k
TOTAL OUTPUT ERROR
vs POWER-SUPPLY VOLTAGE
2
Output error is essentially
independent of both
1 V+ supply voltage and
input common-mode voltage.
0 G=1
G = 10
–1 G = 25
–2
0
10 20 30 40 50 60 70
Power-Supply Voltage (V)
TOTAL OUTPUT ERROR vs VIN
5
–55°C
VIN = (VI+N – VI–N)
0
–5 +150°C
+25°C
–10
–15
0
25 50 75 100 125 150 200
VIN (mV)
QUIESCENT CURRENT
vs POWER-SUPPLY VOLTAGE
50
40 +150°
+125°
30
+25°
20 –55°
Use INA168 with
(V+) > 36V
10
0
0 10 20 30 40 50 60 70
Power-Supply Voltage (V)
®
INA138, INA168
4

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TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C, V+ = 5V, VI+N = 12V, RL = 125k, unless otherwise noted.
200mV
G=1
100mV
100mV
G=1
0mV
STEP RESPONSE
10µs/div
50mV/div
G = 25
0V
G = 10
0V
STEP RESPONSE
10µs/div
1V/div
500mV/div
®
5 INA138, INA168