TI1 INA193A-Q1 Current shunt monitors â 16-v to 80-v common-mode range Datasheet

INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
www.ti.com............................................................................................................................................... SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008
CURRENT SHUNT MONITORS
–16-V to +80-V Common-Mode Range
FEATURES
APPLICATIONS
•
•
•
•
•
•
•
•
•
1
•
•
•
•
Qualified for Automotive Applications
Wide Common-Mode Voltage:
–16 V to +80 V
Low Error: 3.0% Over Temperature (Max)
Bandwidth: Up to 500 kHz
Three Transfer Functions Available:
20 V/V, 50 V/V, and 100 V/V
Complete Current-Sense Solution
Welding Equipment
Notebook Computers
Cell Phones
Telecom Equipment
Automotive
Power Management
Battery Chargers
DESCRIPTION
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 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. The INA193A–INA195A provide identical functions but alternative pin configurations to the
INA196A–INA198A, respectively.
The INA193A–INA198A 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.
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
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2008, Texas Instruments Incorporated
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008............................................................................................................................................... www.ti.com
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.
ORDERING INFORMATION (1)
PACKAGE (2)
TA
–40°C to 125°C
(1)
(2)
SOT-23 – DBV
ORDERABLE PART NUMBER
Reel of 3000
TOP-SIDE MARKING
INA193AQDBVRQ1
BOG
INA194AQDBVRQ1
BOH
INA195AQDBVRQ1
BOI
INA196AQDBVRQ1
BOJ
INA197AQDBVRQ1
BOK
INA198AQDBVRQ1
BOL
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the
website at www.ti.com.
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
INA193A
INA194A
INA195A
DBV PACKAGE
(TOP VIEW)
OUT
1
INA196A
INA197A
INA198A
DBV PACKAGE
(TOP VIEW)
5 V+
GND 2
VIN+ 3
OUT
1
5 VIN–
GND 2
4 VIN–
V+ 3
4 VIN+
ABSOLUTE MAXIMUM RATINGS (1)
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
Supply voltage
UNIT
18
V
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
Analog output voltage range (2)
OUT
Input current into any pin (2)
Storage temperature range
–65
Junction temperature
Human-Body Model
ESD qualification ratings
(2)
2
mA
150
°C
150
°C
4000
Machine Model
200
Charged-Device Model
(1)
V
5
V
1000
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. 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.
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
www.ti.com............................................................................................................................................... SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008
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
PSR
Offset voltage vs
power supply
IB
Input bias current
VSENSE = VIN+ − VIN–
VIN+ = −16 V to +80 V
VIN+ = 12 V to 80 V
25°C
Full range
–16
25°C
80
94
Full range
100
120
dB
25°C
±0.5
2
Full range
0.5
3
Full range
2.5
VS = 2.7 V to 18 V,
VIN+ = 18 V
Full range
5
100
µV/V
VIN– pin
Full range
±8
±23
µA
mV
µV/°C
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
OUTPUT (VSENSE < 20 mV)
VSENSE = 20 mV to 100 mV
No sustained oscillation
±0.2
±1
±2
Output voltage
±0.75
±2.2
±1
±3
25°C
±0.002
±0.1
25°C
1.5
Ω
25°C
10
nF
–16 V ≤ VCM < 0
300
VS < VCM ≤ 80 V
300
INA193A,
INA196A
INA194A,
INA197A
(1)
(2)
(3)
(4)
%
%
mV
0.4
25°C
0 V ≤ VCM ≤ VS,
VS = 5 V
1
INA195A,
INA198A
VOLTAGE OUTPUT
%
(2)
All devices
VOUT
25°C
Full range
Output impedance
V/V
Full range
25°C
Total output error (1)
50
100
V
2
(3)
Swing to V+ power-supply rail
RL = 100 kΩ to GND
Full range
V+ – 0.1
Swing to GND (4)
RL = 100 kΩ to GND
Full range
VGND + 3 VGND + 50
V+ – 0.2
V
mV
Total output error includes effects of gain error and VOS.
For details on this region of operation, see Accuracy Variations as a Result of VSENSE and Common-Mode Voltage in Applications
Information.
See Typical Characteristics curve Output Swing vs Output Current.
Specified by design
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
3
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008............................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
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
300
INA195A,
INA198A
Phase margin
SR
Slew rate
ts
Settling time (1%)
kHz
200
CLOAD < 10 nF
VSENSE = 10 mV to 100 mVPP,
CLOAD = 5 pF
25°C
40
°
1
V/µs
25°C
2
µs
25°C
40
nV/√Hz
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
θJA
4
Operating temperature
–40
Storage temperature
–65
Thermal resistance
Submit Documentation Feedback
125
150
200
°C
°C
°C/W
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
www.ti.com............................................................................................................................................... SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008
TYPICAL CHARACTERISTICS
TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted)
GAIN
vs
FREQUENCY
GAIN
vs
FREQUENCY
45
45
40
G = 50
35
Gain (dB)
30
G = 100
40
G = 50
35
Gain (dB)
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)
COMMON-MODE and POWER-SUPPLY REJECTION
vs
FREQUENCY
GAIN PLOT
20
140
18
130
Common- Mode and
Power- Supply Rejection (dB)
100V/V
16
VOUT (V)
14
50V/V
12
10
8
20V/V
6
4
2
120
CMR
110
100
90
PSR
80
70
60
50
40
0
20
100
200
300
400
500
600
700
800
900
10
100
1k
VDIFFERENTIAL (mV)
100k
10k
Frequency (Hz)
OUTPUT ERROR
vs
VSENSE
OUTPUT ERROR
vs
COMMON-MODE VOLTAGE
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)
Copyright © 2006–2008, Texas Instruments Incorporated
0
450 500
–16 –12 –8 –4
0
4
8
12 16 20
...
76 80
Common-Mode Voltage (V)
Submit Documentation Feedback
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
5
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008............................................................................................................................................... www.ti.com
TYPICAL CHARACTERISTICS (continued)
TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted)
POSITIVE OUTPUT VOLTAGE SWING
vs
OUTPUT CURRENT
QUIESCENT CURRENT
vs
OUTPUT VOLTAGE
12
1000
11
800
25°C
8
700
125°C
7
6
5
VS = 3 V
Sourcing Current
4
25°C
–40°C
600
2
500
400
300
Output stage is designed
to source current. Current
sinking capability is
approximately 400 µA.
3
1
0
–40°C
IQ (µA)
Output Voltage (V)
900
VS = 12 V
Sourcing Current
10
9
200
100
125°C
0
0
5
10
15
20
25
30
0
1
2
Output Current (mA)
VS = 2.7 V
575
475
VS = 12 V
VSENSE = 0 mV
VS = 2.7 V
275
Output Short-Circuit Current (mA)
VS = 12 V
675
IQ (µA)
6
34
VSENSE = 100 mV
175
–16 –12 –8 –4
5
7
9
10
–40°C
30
25°C
26
125°C
22
18
14
10
6
0
4
8
12 16
20
...
2.5 3.5
76 80
4.5
5.5 6.5
7.5
8.5
9.5 10.5 11.5 17
18
Supply Voltage (V)
VCM (V)
STEP RESPONSE
STEP RESPONSE
G = 20
Output Voltage (50 mV/div)
Output Voltage (500 mV/div)
G = 20
VSENSE = 10 mV to 20 mV
Time (2 µs/div)
6
8
OUTPUT SHORT-CIRCUIT CURRENT
vs
SUPPLY VOLTAGE
775
375
4
Output Voltage (V)
QUIESCENT CURRENT
vs
COMMON-MODE VOLTAGE
875
3
Submit Documentation Feedback
VSENSE = 10 mV to 100 mV
Time (2 µs/div)
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
www.ti.com............................................................................................................................................... SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008
TYPICAL CHARACTERISTICS (continued)
TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted)
STEP RESPONSE
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)
STEP RESPONSE
STEP RESPONSE
G = 50
Output Voltage (1 V/div)
Output Voltage (100 mV/div)
G = 50
VSENSE = 10 mV to 100 mV
VSENSE = 90 mV to 100 mV
Time (5 µs/div)
Time (5 µs/div)
STEP RESPONSE
Output Voltage (2 V/div)
G = 100
VSENSE = 10 mV to 100 mV
Time (10 µs/div)
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
7
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008............................................................................................................................................... www.ti.com
APPLICATION INFORMATION
Basic Connection
Figure 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.
RS
IS
VIN+
V+
2.7 V to 18 V
–16 V to +80 V
VIN+
5 kΩ
VIN–
Load
5 kΩ
OUT
INA193A–INA198A
Figure 1. INA19xA Basic Connection
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.
Accuracy Variations as a Result of VSENSE and Common-Mode Voltage
The accuracy of the INA193A–INA198A current shunt monitors is a function of two main variables:
VSENSE (VIN+ – VIN–) and common-mode voltage, VCM, relative to the supply voltage, VS. VCM is expressed as
(VIN+ + VIN–)/2; however, in practice, VCM is seen as the voltage at VIN+ because the voltage drop across VSENSE
is usually small.
8
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
www.ti.com............................................................................................................................................... SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008
This section addresses the accuracy of these specific operating regions:
Normal Case 1:
VSENSE ≥ 20 mV, VCM ≥ VS
Normal Case 2:
VSENSE ≥ 20 mV, VCM < VS
Low VSENSE Case 1:
VSENSE < 20 mV, –16 V ≤ VCM < 0
Low VSENSE Case 2:
VSENSE < 20 mV, 0 V ≤ VCM ≤ VS
Low VSENSE Case 3:
VSENSE < 20 mV, VS < VCM ≤ 80 V
Normal Case 1: VSENSE ≥ 20 mV, VCM ≥ VS
This region of operation provides the highest accuracy. Here, the input offset voltage is characterized and
measured using a two-step method. First, the gain is determined by (Equation 1).
V OUT1 * V OUT2
G+
100 mV * 20 mV
(1)
Where:
VOUT1 = Output voltage with VSENSE = 100 mV
VOUT2 = Output voltage with VSENSE = 20 mV
The offset voltage is then measured at VSENSE = 100 mV and referred to the input (RTI) of the current shunt
monitor, as shown in (Equation 2).
V OSRTI (Referred−To−Input) +
ǒV G Ǔ * 100 mV
OUT1
(2)
In the Typical Characteristics, the Output Error vs Common-Mode Voltage curve shows the highest accuracy for
the this region of operation. In this plot, VS = 12 V; for VCM ≥ 12 V, the output error is at its minimum. This case is
also used to create the VSENSE ≥ 20 mV output specifications in the Electrical Characteristics table.
Normal Case 2: VSENSE ≥ 20 mV, VCM < VS
This region of operation has slightly less accuracy than Normal Case 1 as a result of the common-mode
operating area in which the part functions, as seen in the Output Error vs Common-Mode Voltage curve. As
noted, for this graph VS = 12 V; for VCM < 12 V, the Output Error increases as VCM becomes less than 12 V, with
a typical maximum error of 0.005% at the most negative VCM = –16 V.
Low VSENSE Case 1: VSENSE < 20 mV, –16 V ≤ VCM < 0; and Low VSENSE Case 3: VSENSE < 20 mV,
VS < VCM ≤ 80 V
Although the INA193A–INA198A family of devices are not designed for accurate operation in either of these
regions, some applications are exposed to these conditions; for example, when monitoring power supplies that
are switched on and off while VS is still applied to the INA193A–INA198A. It is important to know what the
behavior of the devices will be in these regions.
As VSENSE approaches 0 mV, in these VCM regions, the device output accuracy degrades. A larger-than-normal
offset can appear at the current shunt monitor output with a typical maximum value of VOUT = 300 mV for
VSENSE = 0 mV. As VSENSE approaches 20 mV, VOUT returns to the expected output value with accuracy as
specified in the Electrical Characteristics. Figure 2 illustrates this effect using the INA195A and INA198A
(Gain = 100).
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
9
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008............................................................................................................................................... www.ti.com
2.0
1.8
1.6
VOUT (V)
1.4
1.2
Actual
1.0
0.8
Ideal
0.6
0.4
0.2
0
0
2
4
6
8
10
12
14
16
18
20
VSENSE (mV)
Figure 2. Example for Low VSENSE Cases 1 and 3
(INA195A, INA198A: Gain = 100)
Low VSENSE Case 2: VSENSE < 20 mV, 0 V ≤ VCM ≤ VS
This region of operation is the least accurate for the INA193A–INA198A family. To achieve the wide input
common-mode voltage range, these devices use two op amp front ends in parallel. One op amp front end
operates in the positive input common-mode voltage range, and the other in the negative input region. For this
case, neither of these two internal amplifiers dominates and overall loop gain is very low. Within this region, VOUT
approaches voltages close to linear operation levels for Normal Case 2. This deviation from linear operation
becomes greatest the closer VSENSE approaches 0 V. Within this region, as VSENSE approaches 20 mV, device
operation is closer to that described by Normal Case 2. Figure 3 illustrates this behavior for the INA195A. The
VOUT maximum peak for this case is tested by maintaining a constant VS, setting VSENSE = 0 mV and sweeping
VCM from 0 V to VS. The exact VCM at which VOUT peaks during this test varies from part to part, but the VOUT
maximum peak is tested to be less than the specified VOUT tested limit.
2.4
INA195, INA198 VOUT Tested Limit(1)
VCM1
2.2
2.0
Ideal
1.8
VCM2
VOUT (V)
1.6
1.4
VCM3
1.2
1.0
0.8
VOUT tested limit at
VSENSE = 0mV, 0 ≤ VCM1 ≤ VS.
VCM4
0.6
VCM2, VCM3, and VCM4 illustrate the variance
from part to part of the VCM that can cause
maximum VOUT with VSENSE < 20mV.
0.4
0.2
0
0
2
4
6
8
10
12
14
16
18
20
22
24
VSENSE (mV)
NOTE: (1) INA193, INA196 VOUT Tested Limit = 0.4V.
INA194, INA197 VOUT Tested Limit = 1V.
Figure 3. Example for Low VSENSE Case 2
(INA195A, INA198A: Gain = 100)
10
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
www.ti.com............................................................................................................................................... SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008
Shutdown
Because the INA193A–INA198A consume a quiescent current less than 1 mA, they can be powered by either the
output of logic gates or by transistor switches to supply power. Use a totem pole output buffer or gate that can
provide sufficient drive along with 0.1 µF bypass capacitor, preferably ceramic with good high frequency
characteristics. This gate should have a supply voltage of 3 V or greater because the INA193A–INA198A
requires a minimum supply greater than 2.7 V. In addition to eliminating quiescent current, this gate also turns off
the 10 µA bias current present at each of the inputs. An example shutdown circuit is shown in Figure 4.
IL
RS
VIN+
-16 V to 80 V
Negative
and
Positive
Common-Mode
Voltage
VIN+
VIN-
R1
R2
V+
Load
V+ > 3 V
A1
0.1 mF
A2
OUT
RL
INA193A-INA198A
Figure 4. INA193A–INA198A Example Shutdown Circuit
Selecting RS
The value chosen for the shunt resistor, RS, depends on the application and is a compromise between
small-signal 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.
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, since 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.
Use of MOVs or VDRs is not recommended 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 since 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.)
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
11
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008............................................................................................................................................... www.ti.com
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.
RFI/EMI
Attention to good layout practices is always recommended. Keep traces short and, when possible, use a printed
circuit 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.
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 5).
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:
5 kΩ
Gain Error % = 100 – ( 100 ×
(
5 kΩ + RFILT
(3)
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
100-Ω 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.
Note that 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.
12
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
www.ti.com............................................................................................................................................... SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008
RSHUNT << RFILTER
LOAD
VSUPPLY
RFILTER < 100
RFILTER < 100
CFILTER
f
f
3dB =
3dB
1
2π (2 RFILTER) CFILTER
5V
VIN+
5 kΩ
VIN–
V+
5 kΩ
OUT
INA193A–INA198A
Figure 5. Input Filter (Gain Error = 1.5% to –2.2%)
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
13
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008............................................................................................................................................... www.ti.com
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 6) 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.
IS
RS
VIN+
Negative
and Positive
Common-Mode
Voltage
V+
VIN+
VIN–
5 kΩ
Load
5 kΩ
A1
A2
OUT =
INA193A–INA198A
ISRSRL
5 kΩ
RL
Figure 6. INA19xA Simplified Circuit Diagram
14
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
www.ti.com............................................................................................................................................... SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008
RSHUNT
LOAD
12 V
I1
5V
VIN+
5 kΩ
VIN–
V+
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. Monitor Bipolar Output Power-Supply Current
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
15
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008............................................................................................................................................... www.ti.com
RSHUNT
LOAD
VSUPPLY
5V
VIN+
5 kΩ
VIN–
5V
VIN+
V+
5 kΩ
VIN–
5 kΩ
V+
5 kΩ
5V
40 kΩ
OUT
40 kΩ
INA152
OUT
INA193A–
INA198A
INA193A–
INA198A
VOUT
40 kΩ
40 kΩ
2.5 V
VREF
Figure 8. 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 9. Inductive Current Monitor Including Flyback
16
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
INA193A-Q1, INA194A-Q1, INA195A-Q1
INA196A-Q1, INA197A-Q1, INA198A-Q1
www.ti.com............................................................................................................................................... SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008
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+
VIN–
V+
5 kΩ
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 10. INA19xA With Comparator
Copyright © 2006–2008, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1
17
PACKAGE OPTION ADDENDUM
www.ti.com
9-Sep-2011
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package
Drawing
Pins
Package Qty
Eco Plan
(2)
Lead/
Ball Finish
MSL Peak Temp
(3)
INA193AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
INA194AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
INA195AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
INA196AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
INA197AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
INA198AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Samples
(Requires Login)
(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)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
9-Sep-2011
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Audio
www.ti.com/audio
Communications and Telecom www.ti.com/communications
Amplifiers
amplifier.ti.com
Computers and Peripherals
www.ti.com/computers
Data Converters
dataconverter.ti.com
Consumer Electronics
www.ti.com/consumer-apps
DLP® Products
www.dlp.com
Energy and Lighting
www.ti.com/energy
DSP
dsp.ti.com
Industrial
www.ti.com/industrial
Clocks and Timers
www.ti.com/clocks
Medical
www.ti.com/medical
Interface
interface.ti.com
Security
www.ti.com/security
Logic
logic.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Power Mgmt
power.ti.com
Transportation and Automotive www.ti.com/automotive
Microcontrollers
microcontroller.ti.com
Video and Imaging
RFID
www.ti-rfid.com
OMAP Mobile Processors
www.ti.com/omap
Wireless Connctivity
www.ti.com/wirelessconnectivity
TI E2E Community Home Page
www.ti.com/video
e2e.ti.com
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2011, Texas Instruments Incorporated