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INA193A-Q1, INA194A-Q1, INA195A-Q1, INA196A-Q1, INA197A-Q1, INA198A-Q1
INA193A-Q1, INA194A-Q1, INA195A-Q1,
INA196A-Q1,
SBOS366E
– AUGUSTINA197A-Q1,
2006 – REVISEDINA198A-Q1
JANUARY 2021
SBOS366E – AUGUST 2006 – REVISED JANUARY 2021
INA19xA-Q1 Current Shunt Monitors –16-V to 80-V Common-Mode Range
1 Features
3 Description
•
•
The INA19xA-Q1 family of current shunt monitors with
voltage output can sense drops across shunts at
common-mode voltages from –16 V to 80 V,
independent of the INA19xA supply voltage. They are
available with three output voltage scales: 20 V/V,
50 V/V, and 100 V/V. The 500-kHz bandwidth
simplifies use in current control loops and monitoring
DC motor health. The INA193A–INA195A provide
identical functions but alternative pin configurations to
the INA196A–INA198A, respectively.
•
•
•
•
•
Qualified for Automotive Applications
Functional Safety-Capable
– Documentation available to aid functional safety
system design
Wide Common-Mode Voltage:
–16 V to 80 V
Low Error: 3% Overtemperature (Maximum)
Bandwidth: Up to 500 kHz
Three Transfer Functions Available: 20 V/V, 50 V/
V, and 100 V/V
Complete Current-Sense Solution
2 Applications
•
•
•
•
•
•
•
Welding Equipment
Body Control Modules
Load Health Monitoring
Telecom Equipment
HEV/EV Powertrain
Power Management
Battery Chargers
The INA19xA-Q1 operate from a single 2.7-V to 18-V
supply. They are specified over the extended
operating temperature range (–40°C to 125°C), and
are offered in a space-saving SOT-23 package.
Device Information (1)
PART NUMBER
INA19xA-Q1
(1)
PACKAGE
BODY SIZE (NOM)
SOT-23 (5)
2.90 mm × 1.60 mm
For all available packages, see the package option
addendum at the end of the data sheet.
RS
IS
VIN+
–16 V to +80 V
Negative
and
Positive
Common-Mode
Voltage
V+
2.7 V to 18 V
VIN+
VIN–
Load
5 kΩ
5 kΩ
A1
A2
OUT =
ISRSRL
5 kΩ
RL
INA193A–INA198A
Simplified Schematic
An©IMPORTANT
NOTICEIncorporated
at the end of this data sheet addresses availability, warranty, changes, use in
safety-critical
applications,
Copyright
2021 Texas Instruments
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Table of Contents
1 Features............................................................................1
2 Applications..................................................................... 1
3 Description.......................................................................1
4 Revision History.............................................................. 2
5 Pin Configuration and Functions...................................3
6 Specifications.................................................................. 4
6.1 Absolute Maximum Ratings........................................ 4
6.2 ESD Ratings............................................................... 4
6.3 Recommended Operating Conditions.........................4
6.4 Thermal Information....................................................4
6.5 Electrical Characteristics.............................................5
6.6 Typical Characteristics................................................ 7
7 Detailed Description...................................................... 11
7.1 Overview................................................................... 11
7.2 Functional Block Diagram......................................... 11
7.3 Feature Description...................................................11
7.4 Device Functional Modes..........................................16
8 Application and Implementation.................................. 20
8.1 Application Information............................................. 20
8.2 Typical Application.................................................... 20
9 Power Supply Recommendations................................21
10 Layout...........................................................................22
10.1 Layout Guidelines................................................... 22
10.2 Layout Example...................................................... 22
11 Device and Documentation Support..........................23
11.1 Receiving Notification of Documentation Updates.. 23
11.2 Support Resources................................................. 23
11.3 Trademarks............................................................. 23
11.4 Electrostatic Discharge Caution.............................. 23
11.5 Glossary.................................................................. 23
12 Mechanical, Packaging, and Orderable
Information.................................................................... 23
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (July 2015) to Revision E (January 2021)
Page
• Updated the numbering format for tables, figures, and cross-references throughout the document..................1
• Added Functional Safety bullets......................................................................................................................... 1
Changes from Revision C (October 2008) to Revision D (July 2015)
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and
Documentation Support section, and Mechanical, Packaging, and Orderable Information section .................. 1
• Added Input Bias Current vs Common Mode Voltage Vs=5 Vgraph toTypical Characteristics ......................... 7
• Added Input Bias Current vs Common Mode Voltage Vs=12 V graph to Typical Characteristics ..................... 7
2
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5 Pin Configuration and Functions
OUT
1
GND
2
VIN+
3
5
V+
4
VIN-
Figure 5-1. DBV Package 5-Pin SOT-23 INA193A-Q1, INA194A-Q1, INA195A-Q1 Top View
OUT
1
GND
2
V+
3
5
VIN-
4
VIN+
Figure 5-2. DBV Package 5-Pin SOT-23 INA196A-Q1, INA197A-Q1, INA198A-Q1 Top View
Table 5-1. Pin Functions
PIN
INA193A-Q1,
INA194A-Q1,
INA195A-Q1
INA196A-Q1,
INA197A-Q1,
INA198A-Q1
TYPE
GND
2
2
GND
OUT
1
1
O
NAME
DESCRIPTION
Ground
Output voltage
V+
5
3
Analog
VIN+
3
4
I
Connect to supply side of shunt resistor
VIN–
4
5
I
Connect to load side of shunt resistor
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Power supply, 2.7 to 18 V
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)
MIN
MAX
UNIT
18
V
Supply voltage
Differential input voltage range, analog inputs (VIN+ – VIN–)
–18
18
V
Common-mode voltage range(2)
–16
80
V
GND – 0.3
(V+) + 0.3
V
5
mA
150
°C
150
°C
Analog output voltage range(2)
OUT
Input current into any pin(2)
Junction temperature
Storage temperature, Tstg
(1)
(2)
–65
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under
Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device
reliability.
Input voltage at any pin may exceed the voltage shown if the current at that pin is limited to 5 mA.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
Electrostatic discharge
Human-body model (HBM), per AEC Q100-002(1)
±4000
Charged-device model (CDM), per AEC Q100-011
±1000
Machine model
±200
UNIT
V
AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
VCM
Common-mode input voltage
NOM
MAX
12
V+
Operating supply voltage
TA
Operating free-air temperature
UNIT
V
12
V
-40
125
°C
6.4 Thermal Information
INA19xA-Q1
THERMAL METRIC(1)
DBV (SOT-23)
UNIT
5 PINS
RθJA
Junction-to-ambient thermal resistance
221.7
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
144.7
°C/W
RθJB
Junction-to-board thermal resistance
49.7
°C/W
ψJT
Junction-to-top characterization parameter
26.1
°C/W
ψJB
Junction-to-board characterization parameter
49
°C/W
(1)
4
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
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6.5 Electrical Characteristics
VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV (unless otherwise noted) Full range TA = –40°C to 125°C
PARAMETER
TEST CONDITIONS
TA
MIN
TYP
MAX
UNIT
0.15
(VS – 0.2)/
Gain
V
80
V
INPUT
VSENSE
Full-scale input voltage
VCM
Common-mode input
CMR
Common-mode rejection
VOS
Offset voltage, RTI
dVOS/dT
Offset voltage vs temperature
VSENSE = VIN+ − VIN–
25°C
Full range
–16
VIN+ = −16 V to 80 V
25°C
80
94
VIN+ = 12 V to 80 V
Full range
100
120
dB
25°C
±0.5
2
Full range
0.5
3
Full range
2.5
mV
μV/°C
PSR
Offset voltage vs power supply
VS = 2.7 V to 18 V, VIN+ = 18 V
Full range
5
100
μV/V
IB
Input bias current
VIN– pin
Full range
±8
±23
μA
OUTPUT (VSENSE ≥ 20 mV)
INA193A, INA196A
G
Gain
INA194A, INA197A
20
25°C
INA195A, INA198A
Gain error
VSENSE = 20 mV to 100 mV
Nonlinearity error
RO
Maximum capacitive load
25°C
VSENSE = 20 mV to 100 mV
No sustained oscillation
±0.2%
±1%
±2%
±0.75%
±2.2%
±1%
±3%
25°C
±0.002%
±0.1%
25°C
1.5
Ω
25°C
10
nF
Full range
Output impedance
V/V
Full range
25°C
Total output error(1)
50
100
OUTPUT (VSENSE < 20 mV) (4)
All devices
VOUT
Output voltage
–16 V ≤ VCM < 0
300
VS < VCM ≤ 80 V
300
INA193A,
INA196A
INA194A,
INA197A
mV
0.4
25°C
0 V ≤ VCM ≤ VS,
VS = 5 V
1
INA195A,
INA198A
V
2
VOLTAGE OUTPUT(2)
Swing to V+ power-supply rail
RL = 100 kΩ to GND
Full range
V+ – 0.1
Swing to GND(3)
RL = 100 kΩ to GND
Full range
VGND + 3 VGND + 50
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V+ – 0.2
V
mV
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VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV (unless otherwise noted) Full range TA = –40°C to 125°C
PARAMETER
TEST CONDITIONS
TA
MIN
TYP
MAX
UNIT
FREQUENCY RESPONSE
INA193A,
INA196A
BW
Bandwidth
INA194A,
INA197A
500
CLOAD = 5 pF
25°C
INA195A,
INA198A
Phase margin
SR
200
CLOAD < 10 nF
25°C
40
°
1
V/μs
25°C
2
μs
25°C
40
nV/√ Hz
Slew rate
ts
Settling time (1%)
kHz
300
VSENSE = 10 mV to 100 mVPP,
CLOAD = 5 pF
NOISE, RTI
Voltage noise density
POWER SUPPLY
VS
Operating voltage
Full range
VOUT = 2 V
IQ
Quiescent current
INA193A,
INA194A,
INA196A,
INA197A
2.7
Full range
VSENSE = 0 mV
18
700
1250
370
950
370
1050
Full range
INA195A,
INA198A
V
μA
TEMPERATURE RANGE
(1)
(2)
(3)
(4)
6
Operating temperature
–40
125
°C
Storage temperature
–65
150
°C
Total output error includes effects of gain error and VOS.
See Figure 6-7.
Specified by design
For details on this region of operation, see Section 7.4.2.
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6.6 Typical Characteristics
TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted)
45
40
G = 50
35
Gain (dB)
30
G = 100
40
G = 50
35
Gain (dB)
45
CLOAD = 1000 pF
G = 100
G = 20
25
20
30
20
15
15
10
10
5
G = 20
25
5
10k
100k
10k
1M
100k
Frequency (Hz)
Figure 6-1. Gain vs Frequency
Figure 6-2. Gain vs Frequency
20
140
130
100V/V
Common- Mode and
Power- Supply Rejection (dB)
18
16
VOUT (V)
14
50V/V
12
10
8
20V/V
6
4
2
0
20
100
200
300
400
500
600
700
120
CMR
110
100
90
PSR
80
70
60
50
40
800
900
10
100
1k
VDIFFERENTIAL (mV)
100k
10k
Frequency (Hz)
Figure 6-3. Gain Plot
Figure 6-4. Common-Mode and Power-Supply
Rejection vs Frequency
4.0
0.1
3.5
0.09
0.08
3.0
Output Error (%)
Output Error
(% error of the ideal output value)
1M
Frequency (Hz)
2.5
2.0
1.5
1.0
0.07
0.06
0.05
0.04
0.03
0.02
0.5
0.01
0
0
50
100 150
200
250 300
350 400
VSENSE (mV)
Figure 6-5. Output Error vs Vsense
Copyright © 2021 Texas Instruments Incorporated
450 500
0
–16 –12 –8 –4
0
4
8
12 16 20
...
76 80
Common-Mode Voltage (V)
Figure 6-6. Output Error vs Common-Mode Voltage
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12
1000
11
10
9
800
25°C
8
700
125°C
7
6
5
VS = 3 V
Sourcing Current
4
25°C
–40°C
600
500
400
300
Output stage is designed
to source current. Current
sinking capability is
approximately 400 µA.
3
2
1
0
–40°C
IQ (µA)
Output Voltage (V)
900
VS = 12 V
Sourcing Current
200
100
125°C
0
0
5
10
15
20
25
30
0
1
2
Output Current (mA)
15
15
12.5
IN-
IN+
5
2.5
0
-2.5
-5
8
9
10
5
2.5
0
-2.5
-5
-7.5
-7.5
-10
-10
-10
0
10
20
30
40
50
Common-Mode Voltage (V)
60
70
80
-12.5
-20
-10
0
10
20
30
40
50
Common-Mode Voltage (V)
60
70
80
D102
Vs =12 V
Figure 6-10. Input Bias Current vs Common Mode
Voltage
VS = 12 V
VS = 2.7 V
775
675
575
475
VS = 12 V
VSENSE = 0 mV
VS = 2.7 V
275
Output Short-Circuit Current (mA)
34
VSENSE = 100 mV
175
–16 –12 –8 –4
IN+
IN-
D001
Figure 6-9. Input Bias Current vs Common Mode
Voltage
IQ (µA)
7
7.5
Vs=5 V
–40°C
30
25°C
26
125°C
22
18
14
10
6
0
4
8
12 16
20
...
76 80
VCM (V)
Figure 6-11. Quiescent Current vs Common Mode
Voltage
8
6
10
7.5
Input Bias Current (PA)
Input Bias Current (PA)
10
375
5
Figure 6-8. Quiescent Current vs Output Voltage
12.5
875
4
Output Voltage (V)
Figure 6-7. Positive Output Voltage Swing vs
Output Current
-12.5
-20
3
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2.5 3.5
4.5
5.5 6.5
7.5
8.5
9.5 10.5 11.5 17
18
Supply Voltage (V)
Figure 6-12. Output Short Circuit Current vs
Supply Voltage
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G = 20
Output Voltage (50 mV/div)
Output Voltage (500 mV/div)
G = 20
VSENSE = 10 mV to 100 mV
VSENSE = 10 mV to 20 mV
Time (2 µs/div)
Time (2 µs/div)
Figure 6-13. Step Response
Figure 6-14. Step Response
G = 50
Output Voltage (50 mV/div)
Output Voltage (100 mV/div)
G = 20
VSENSE = 90 mV to 100 mV
VSENSE = 10 mV to 20 mV
Time (2 µs/div)
Time (5 µs/div)
Figure 6-15. Step Response
Figure 6-16. Step Response
G = 50
Output Voltage (1 V/div)
Output Voltage (100 mV/div)
G = 50
VSENSE = 10 mV to 100 mV
Time (5 µs/div)
Figure 6-17. Step Response
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VSENSE = 90 mV to 100 mV
Time (5 µs/div)
Figure 6-18. Step Response
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Output Voltage (2 V/div)
G = 100
VSENSE = 10 mV to 100 mV
Time (10 µs/div)
Figure 6-19. Step Response
10
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7 Detailed Description
7.1 Overview
The INA193A−INA198A family of current shunt monitors with voltage output can sense drops across shunts at
common mode voltages from −16 V to 80 V, independent of the INA19x supply voltage. They are available with
three output voltage scales: 20 V/V, 50 V/V, and 100 V/V. The 500-kHz bandwidth simplifies use in current
control loops. The INA193A−INA195A devices provide identical functions but alternative pin configurations to the
INA196A−INA198A, respectively.
The INA193A−INA198A devices operate from a single 2.7-V to 18-V supply, drawing a maximum of 900 μA of
supply current. They are specified over the extended operating temperature range (−40°C to 125°C), and are
offered in a space-saving SOT-23 package.
7.2 Functional Block Diagram
VIN+
VIN
R1(1)
5 k:
R1(1)
5 k:
V+
A1
A2
G = 20, RL = 100 k:
G = 50, RL = 250 k:
G = 100, RL = 500 k:
INA193A-INA198A
OUT
RL(1)
GND
7.3 Feature Description
7.3.1 Basic Connection
Figure 7-1 shows the basic connection of the INA19xA. The input pins, VIN+ and VIN–, should be connected as
closely as possible to the shunt resistor to minimize any resistance in series with the shunt resistance.
Power-supply bypass capacitors are required for stability. Applications with noisy or high-impedance power
supplies may require additional decoupling capacitors to reject power-supply noise. Connect bypass capacitors
close to the device pins.
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RS
IS
VIN+
V+
2.7 V to 18 V
–16 V to +80 V
VIN+
5 kΩ
Load
VIN–
5 kΩ
OUT
INA193A–INA198A
Figure 7-1. INA19xA Basic Connections
7.3.2 Selecting RS
The value chosen for the shunt resistor, RS, depends on the application and is a compromise between smallsignal accuracy and maximum permissible voltage loss in the measurement line. High values of RS provide
better accuracy at lower currents by minimizing the effects of offset, while low values of RS minimize voltage loss
in the supply line. For most applications, best performance is attained with an RS value that provides a full-scale
shunt voltage range of 50 mV to 100 mV. Maximum input voltage for accurate measurements is 500 mV.
7.3.3 Inside the INA19xA
The INA19xA uses a new, unique, internal circuit topology that provides common mode range extending from –
16 V to 80 V while operating from a single power supply. The common mode rejection in a classic
instrumentation amplifier approach is limited by the requirement for accurate resistor matching. By converting the
induced input voltage to a current, the INA19xA provides common mode rejection that is no longer a function of
closely matched resistor values, providing the enhanced performance necessary for such a wide common mode
range. A simplified diagram (see Figure 7-1) shows the basic circuit function. When the common mode voltage is
positive, amplifier A2 is active.
The differential input voltage, VIN+ – VIN– applied across RS, is converted to a current through a 5-kΩ resistor.
This current is converted back to a voltage through RL, and then amplified by the output buffer amplifier. When
the common mode voltage is negative, amplifier A1 is active. The differential input voltage, VIN+ – VIN– applied
across RS, is converted to a current through a 5-kΩ resistor. This current is sourced from a precision current
mirror whose output is directed into RL, converting the signal back into a voltage and amplified by the output
buffer amplifier. Patent-pending circuit architecture ensures smooth device operation, even during the transition
period where both amplifiers A1 and A2 are active.
12
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RSHUNT
LOAD
12 V
I1
5V
VIN+
5 kΩ
V+
VIN–
5 kΩ
V+
INA193A–INA198A
OUT
for 12-V
common mode
INA193A–INA198A
5 kΩ
GND
5 kΩ
OUT
for –12-V
common mode
VIN+
VIN–
GND
RSHUNT
–12 V
LOAD
I2
Figure 7-2. Monitor Bipolar Output Power-Supply Current
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RSHUNT
LOAD
VSUPPLY
5V
VIN+
VIN–
5 kΩ
5V
VIN+
V+
5 kΩ
VIN–
5 kΩ
V+
5 kΩ
5V
INA152
40 kΩ
OUT
40 kΩ
OUT
INA193A–
INA198A
INA193A–
INA198A
VOUT
40 kΩ
40 kΩ
2.5 V
VREF
Figure 7-3. Bidirectional Current Monitoring
Up to 80 V
RSHUNT
2.7 V to 18 V
Solenoid
VIN+
5 kΩ
VIN–
V+
5 kΩ
OUT
INA193A–
INA198A
Figure 7-4. Inductive Current Monitor Including Flyback
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VIN+
VIN–
5 kΩ
V+
5 kΩ
OUT
For output signals > comparator trip point
R1
INA193A–
INA198A
TLV3012
R2
REF
1.25V
Internal
Reference
(a) INA19xA Output Adjusted by Voltage Divider
VIN+
5 kΩ
VIN–
V+
5 kΩ
OUT
INA193A–
INA198A
TLV3012
R1
R2
REF
1.25V
Internal
Reference
For use with
small output signals.
(b) Comparator Reference Voltage Adjusted by Voltage Divider
Figure 7-5. INA19xA With Comparator
7.3.4 Power Supply
The input circuitry of the INA19xA can accurately measure beyond its power-supply voltage, V+. For example,
the V+ power supply can be 5 V, whereas the load power-supply voltage is up to 80 V. The output voltage range
of the OUT terminal, however, is limited by the voltages on the power-supply pin.
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7.4 Device Functional Modes
7.4.1 Input Filtering
An obvious and straightforward location for filtering is at the output of the INA19xA series; however, this location
negates the advantage of the low output impedance of the internal buffer. The only other option for filtering is at
the input pins of the INA19xA, which is complicated by the internal 5-kΩ ± 30% input impedance (see Figure
7-6). Using the lowest possible resistor values minimizes both the initial shift in gain and effects of tolerance. The
effect on initial gain is given by:
Gain Error % = 100 – ( 100 ×
5 kΩ
5 kΩ + RFILT
(
(1)
Total effect on gain error can be calculated by replacing the 5-kΩ term with 5 kΩ – 30% (or 3.5 kΩ) or
5 kΩ + 30% (or 6.5 kΩ). The tolerance extremes of RFILT can also be inserted into the equation. If a pair of 100Ω 1% resistors are used on the inputs, the initial gain error is 1.96%. Worst-case tolerance conditions always
occur at the lower excursion of the internal 5-kΩ resistor (3.5 kΩ), and the higher excursion of RFILT, 3% in this
case.
The specified accuracy of the INA19xA must then be combined in addition to these tolerances. While this
discussion treats accuracy worst-case conditions by combining the extremes of the resistor values, it is
appropriate to use geometric mean or root sum square calculations to total the effects of accuracy variations.
RSHUNT 3 V
A1
0.1 mF
A2
OUT
RL
INA193A-INA198A
Figure 7-9. INA19xA-Q1 Example Shutdown Circuit
7.4.4 Transient Protection
The –16-V to 80-V common mode range of the INA19xA is ideal for withstanding automotive fault conditions
ranging from 12-V battery reversal up to 80-V transients, because no additional protective components are
needed up to those levels. In the event that the INA19xA is exposed to transients on the inputs in excess of its
ratings, then external transient absorption with semiconductor transient absorbers (zeners or Transzorbs) are
necessary. TI does not recommend using MOVs or VDRs except when they are used in addition to a
semiconductor transient absorber. Select the transient absorber such that it never allows the INA19xA to be
exposed to transients greater than 80 V (that is, allow for transient absorber tolerance, as well as additional
voltage due to transient absorber dynamic impedance). Despite the use of internal zener-type ESD protection,
the INA19xA does not lend itself to using external resistors in series with the inputs because the internal gain
resistors can vary up to ±30%. (If gain accuracy is not important, then resistors can be added in series with the
INA19xA inputs with two equal resistors on each input.)
7.4.5 Output Voltage Range
The output of the INA19xA is accurate within the output voltage swing range set by the power supply pin, V+.
This is best illustrated when using the INA195A or INA198A (which are both versions using a gain of 100), where
a 100-mV full-scale input from the shunt resistor requires an output voltage swing of 10 V, and a power-supply
voltage sufficient to achieve 10 V on the output.
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8 Application and Implementation
Note
Information in the following applications sections is not part of the TI component specification, and TI
does not warrant its accuracy or completeness. TI’s customers are responsible for determining
suitability of components for their purposes, as well as validating and testing their design
implementation to confirm system functionality.
8.1 Application Information
The INA193A-INA198A devices measure the voltage developed across a current-sensing resistor when current
passes through it. The ability to have shunt common mode voltages from −16-V to 80-V drive and control the
output signal with Vs offers multiple configurations, as discussed throughout this section.
8.2 Typical Application
The device is a unidirectional, current-sense amplifier capable of measuring currents through a resistive shunt
with shunt common mode voltages from −16 V to 80 V. Two devices can be configured for bidirectional
monitoring and is common in applications that include charging and discharging operations where the current
flow-through resistor can change directions.
RSHUNT
LOAD
VSUPPLY
5V
VIN+
VIN–
5 kΩ
5V
VIN+
V+
5 kΩ
5 kΩ
VIN–
V+
5 kΩ
5V
INA152
40 kΩ
OUT
40 kΩ
OUT
INA193A–
INA198A
INA193A–
INA198A
VOUT
40 kΩ
40 kΩ
2.5 V
VREF
Figure 8-1. Bidirectional Current Monitoring
8.2.1 Design Requirements
Vsupply is set to 12 V, Vref at 2.5 V and a 10-mΩ shunt. The accuracy of the current will typically be less than
0.5% for current greater than ±2 A. For current lower than ±2 A, the accuracy will vary; use Section 7.4.2 for
accuracy considerations.
8.2.2 Detailed Design Procedure
The ability to measure this current flowing in both directions is enabled by adding a unity gain amplifier with a
VREF, as shown in Figure 8-1. The output then responds by increasing above VREF for positive differential
signals (relative to the IN – pin) and responds by decreasing below VREF for negative differential signals. This
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reference voltage applied to the REF pin can be set anywhere from 0 V to V+. For bidirectional applications,
VREF is typically set at mid- scale for equal signal range in both current directions. In some cases, however,
VREF is set at a voltage other than mid-scale when the bidirectional current and corresponding output signal are
not required to be symmetrical.
8.2.3 Application Curve
An example output response of a bidirectional configuration is shown in Figure 8-2. With the REF pin connected
to a reference voltage, 2.5 V in this case, the output voltage is biased upwards by this reference level. The
output rises above the reference voltage for positive differential input signals and falls below the reference
voltage for negative differential input signals.
10
I_in
VOUT
Current (I), Voltage (V)
7.5
5
2.5
0
-2.5
-5
-7.5
-10
0
2
4
6
8
10
12
14
16
18
20
Time (µs)
Figure 8-2. Output Voltage vs Shunt Input Current
9 Power Supply Recommendations
The input circuitry of the INA193A-INA198A devices can accurately measure beyond its power-supply voltage, V
+. For example, the V+ power supply can be 5 V, whereas the load power-supply voltage is up to 80 V. The
output voltage range of the OUT terminal, however, is limited by the voltages on the power-supply pin.
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10 Layout
10.1 Layout Guidelines
10.1.1 RFI/EMI
TI always recommends adhering to good layout practices. Keep traces short and, when possible, use a printedcircuit-board (PCB) ground plane with surface-mount components placed as close to the device pins as possible.
Small ceramic capacitors placed directly across amplifier inputs can reduce RFI/EMI sensitivity. PCB layout
should locate the amplifier as far away as possible from RFI sources. Sources can include other components in
the same system as the amplifier itself, such as inductors (particularly switched inductors handling a lot of
current and at high frequencies). RFI can generally be identified as a variation in offset voltage or dc signal
levels with changes in the interfering RF signal. If the amplifier cannot be located away from sources of radiation,
shielding may be needed. Twisting wire input leads makes them more resistant to RF fields. The difference in
input pin location of the INA193A–INA195A versus the INA196A–INA198A may provide different EMI
performance.
10.2 Layout Example
Via to Power or Ground Plane
Via to Internal Layer
Supply Bypass
Capacitor
Supply Voltage
Output Signal
OUT
V+
GND
IN+
IN-
Shunt Resistor
Figure 10-1. Recommended Layout
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11 Device and Documentation Support
11.1 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. Click on
Subscribe to updates to register and receive a weekly digest of any product information that has changed. For
change details, review the revision history included in any revised document.
11.2 Support Resources
TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight
from the experts. Search existing answers or ask your own question to get the quick design help you need.
Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do
not necessarily reflect TI's views; see TI's Terms of Use.
11.3 Trademarks
TI E2E™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
11.4 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments 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.
11.5 Glossary
TI Glossary
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
INA193AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
BOG
INA194AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
BOH
INA195AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
BOI
INA196AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
BOJ
INA197AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
BOK
INA198AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
BOL
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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