INA282-286EVM User's Guide

INA282-286EVM User's Guide
User's Guide
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INA282-INA286EVM
This user’s guide describes the characteristics, operation, and use of the INA282-286EVM evaluation
module (EVM). This EVM is designed to evaluate the performance of the INA282-286 family of voltage
output current shunt monitors. This EVM has a flexible configuration, allowing for user evaluation suitable
to a variety of applications. This document also includes a schematic and a complete bill of materials.
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Contents
Introduction and Overview ................................................................................................. 2
Quick Start Setup and Use ................................................................................................ 4
INA282-286EVM Circuit .................................................................................................... 6
Reference Voltage Setup ................................................................................................. 10
INA282-286EVM Schematic ............................................................................................. 13
Bill of Materials ............................................................................................................. 14
List of Figures
1
Hardware Included with the INA282-286EVM........................................................................... 3
2
Measurement with Shunt
3
Measurement without Shunt ............................................................................................... 5
4
TO-247 Package in R1 ..................................................................................................... 6
5
CS3 Package in R1 ......................................................................................................... 6
6
TO-126 Package in R1 ..................................................................................................... 6
7
TO-220 Package in R1 ..................................................................................................... 6
8
Radial Package in R2 ...................................................................................................... 8
9
U1 Populated With DIP Board............................................................................................. 9
10
Unidirectional Mode: Positive Differential Voltage Configuration.................................................... 10
11
Unidirectional Mode: Negative Differential Voltage Configuration
12
13
14
15
..................................................................................................
..................................................
Bi-directional Mode: One Reference to Ground, One Reference to Supply Configuration ......................
Bi-directional Mode: Specific Voltage Required Configuration ......................................................
Bi-directional Mode: Buffered Voltage Configuration .................................................................
INA282-286EVM Schematic .............................................................................................
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11
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12
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1
Introduction and Overview
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1
Introduction and Overview
1.1
INA282-286
The INA282-286 devices are voltage output, high-side measurement, bi-directional, zero-drift current shunt
monitors. This family of devices has gains that range from 50V/V to 1000V/V. The voltage developed
across the device inputs is amplified by the corresponding gain of the specific device and is presented at
the output pin. The INA282-286 devices can sense voltage drops across shunts at common-mode
voltages between –14V to 80V, independent of supply voltages. These devices operate with supply
voltages between 2.7V and 18V and draw a maximum of 900µA. The low offset of the zero-drift
architecture enables current sensing with maximum drops across the shunt as low as 10mV full-scale.
The INA282-286 devices are currently available in an SOIC-8 surface-mount package. Table 1
summarizes the available device options.
Table 1. INA282-286 Device Summary
1.2
Product
Gain
INA282
50
INA283
200
INA284
500
INA285
1000
INA286
100
INA282-286EVM
The INA282-286EVM is intended to provide basic functional evaluation of this device family. The fixture
layout is not intended to be a model for the target circuit, nor is it laid out for electromagnetic compatibility
(EMC) testing.
The layout of the INA282-286EVM printed circuit board (PCB) is designed to provide these features:
• Easy handling of the small package; a mechanical drawing of the recommended land pattern is found
at the end of the product data sheet.
• Easy access to all pins of the device
• Space for optional input filtering capacitors and resistors as well as a prototype area for additional
user-defined circuitry
• Space for shunt resistors of various footprints
• Multiple input signal options
• Evaluation of all gain options through provided device boards as well as a location to solder a test
device directly on to the board
The INA282-286EVM allows the user to install a shunt resistor, and then connect both the common-mode
voltage and load to develop the input voltage, or to omit the shunt resistor and apply a differential voltage
directly to the device input. This flexibility allows a user to test the device operation in a simulated manner
as well as in an actual application.
Refer to the INA282-286 product data sheet for comprehensive information about the INA282-286 family
of devices.
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Introduction and Overview
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1.3
Hardware Included
The INA282-286EVM features the SOIC-packaged version of the INA28x. Device boards populated with
each of the available gain versions of the INA282 family of devices will be provided in all INA282-286EVM
delivered, as Figure 1 shows.
Figure 1. Hardware Included with the INA282-286EVM
The INA282-286EVM kit is shipped with the following items:
• INA282-286EVM PCB
• Five populated test boards (INA282, INA283, INA284, INA285, INA286)
If any of the items in the EVM kit shipment are missing or damaged, please contact the Texas Instruments
Product Information Center nearest you to inquire about a replacement.
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Quick Start Setup and Use
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Quick Start Setup and Use
Follow these procedures to set up and use the INA282-286EVM.
Step 1. Insert the device board to be evaluated into the U1 location. The U1 location allows the user
to either evaluate one of the provided device boards or to install the test device directly on
the surface-mount pads in the U1 footprint.
Step 2. Connect an external dc supply voltage between 2.7V and 18V to the V+ terminal referenced
to the GND terminal of T4. The INA282-286 device output voltage is limited to 40mV above
ground to 400mV below the supply level.
Step 3. The default connection for the references is to have the jumper in place on J3 and J4. This
configuration allows for bi-directional operation with the output referenced to mid-supply. The
voltage applied at the reference input can be varied depending on how the device is to be
used. Further details regarding the use of the reference voltage are discussed later in this
guide; refer to Section 4 for additional information on configuring the reference pins based on
the user's application requirements.
Step 4. Connect the Input.
2.1
Measurement With Shunt
This connection method allows the user to install a shunt resistor on the evaluation board and connect the
common-mode voltage and load to incorporate the test device directly into a sample application, as
Figure 2 illustrates. To configure a measurement evaluation with a shunt, follow these procedures.
1. Install shunt resistor into the R2 location. If not using a surface-mount or through-hole shunt, refer to
Section 3.1 for a summary of the R1 component specifications.
2. Connect the common-mode voltage to the VIN terminal of T1.
3. Connect load to the Load terminal of T1.
2.7V to 18V
V+
INA282-286EVM
INA282
V+
Load
R1/2
Load
+
R3
VIN
VOUT
C1
IS
REF1
R4
REF2
GND
Figure 2. Measurement with Shunt
4
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Quick Start Setup and Use
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2.2
Measurement Without Shunt
This connection method allows the user to either simulate the voltage developed across a sense resistor
based on a given set of system conditions, or to connect the INA282-286EVM remotely to an existing
shunt already included in an example application. Figure 3 illustrates a measurement configuration without
a shunt. As a result of the internal architecture of the INA282 family of devices, if this measurement
method is used, make sure the voltage source is either a very low impedance or the differential voltage
applied to the inputs is buffered to prevent additional errors in the circuit.
To configure a measurement evaluation without a shunt, follow these procedures.
1. Connect a differential voltage to the VIN+ and VIN– terminals of T2.
2. Measure the output voltage at the VOUT terminal of T2.
2.7V to 18V
V+
INA282-286EVM
INA282
V+
Load
VDIFF
R1/2
+
+
R3
VIN
VOUT
C1
IS
REF1
R4
VCM
REF2
GND
Figure 3. Measurement without Shunt
NOTE: The output voltage is equal to the reference voltage plus the gain of the device multiplied by
the differential voltage measured directly at the device input pins.
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INA282-286EVM Circuit
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INA282-286EVM Circuit
This section summarizes the INA282-286EVM components.
3.1
R1
R1 can be used for shunt resistors that have a package that is not easily adaptable to a standard,
two-terminal, through-hole footprint or to a 0603 through 1206 surface-mount footprint. Specifically, this
component location was added to allow for the use of TO-126, TO-220, TO-247, and four-terminal inline
radial packages such as the CS3 series of shunts from Ohmite. The numbers located on the PCB
between R1 and J1 correspond to each of the holes in the R1 footprint. Holes with the same number are
connected together. The designation of 1 and 2 indicates that particular hole is connected directly to the
VIN+ and VIN– inputs, respectively. The designation of 3 and 4 indicates that particular hole is intended for
the sense measurement of a four-wire shunt.
Care must be taken to ensure that the shunt is placed in the correct position in the R1 location. This
placement consideration is evident when using a two-connection shunt with a spacing of 200 mils (.200in
or 5,080mm). As shown in Figure 4 through Figure 7, the shunt must be placed in the second
1-designated hole in order for the other leg to fit into the 2 position. If the shunt is placed in the first 1
position, the second leg is left floating; no differential voltage is then generated for the current monitor.
Additional packages can be tested by using the provided prototype area of the board.
Figure 4. TO-247 Package in R1
6
Figure 5. CS3 Package in R1
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Figure 6. TO-126 Package in R1
Figure 7. TO-220 Package in R1
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INA282-286EVM Circuit
3.2
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R2
R2 is intended to handle two- and four-terminal radial packages (as Figure 8 illustrates) as well as
surface-mount packages that range in size from 0603 to 1206.
Figure 8. Radial Package in R2
3.3
R3, R4, C1
R3 and R4 are factory-installed 0Ω resistors. These resistors, in combination with C1, form an input filter.
These locations allow for through-hole and surface-mount packages that range in size from 0603 to 1206.
Additional information regarding the use of input filtering is provided in the INA282-286 product data sheet.
3.4
Bypass Capacitors and Jumpers
C2, C3, and C4 are 0.1mF supply bypass capacitors.
J1 is intended to be used as measurements points of R1, if necessary.
J2 is used as a test port at the factory but can be used for the corresponding input and output pins, if
desired.
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3.5
U1
U1 is the location for the test device. Five device boards are supplied with this INA282-286EVM board;
each device board is populated with one of the available device gains. This interchangeable option allow
users to test the devices and determine the gain setting that is best suited for a given application.
Here is a list of the factors involved in selecting the appropriate device.
• The INA282-286 devices are identical with the exception of different gain settings.
• The limiting factor that requires attention to be given to device selection is the output voltage.
• The output voltage has a restriction: it must remain within the range of 40mV above ground to 400mV
below the supply voltage.
• The differential input voltage is either applied across the inputs, or developed based on the load
current flowing through the shunt resistor.
• The selected device must allow the output voltage to remain within the acceptable range after the
developed input voltage is amplified by the respective device gain.
• An output below the minimum allowable output requires the selection of a device with a higher gain.
Likewise, an output above the maximum allowable output requires the selection of a device with a
smaller gain.
In addition to being able to accommodate the device boards, a surface-mount footprint has been added as
well. This footprint, though, is for an MSOP package that will be available at a later date. This option will
allow a device to be installed directly onto the EVM if needed. Figure 9 shows the U1 slot populated with a
DIP board device as an example.
Figure 9. U1 Populated With DIP Board
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Reference Voltage Setup
3.6
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Voltage Inputs
The VIN+ and VIN– terminals of T2 are intended to be used if the designer is configuring this EVM for
measurement without an onboard shunt resistor (see Figure 3). These inputs accept a differential voltage
that is amplified by the selected device gain and is presented at the VOUT terminal of T2. These inputs
could also be used to connect the differential voltage developed across an external shunt in an existing
circuit. The acceptable differential input voltage range and polarity are determined by the supply voltage,
reference voltage, and gain of the selected device.
The VIN and Load terminals of T1 are intended to be used if the user configures this EVM for
measurement with a shunt resistor, as shown in Figure 2. The common-mode voltage should be
connected to the VIN terminal and the load should be connected to the Load terminal. The shunt can be
installed in R1, R2, or the prototype area, and wired to the R2 footprint. As in the setup for the
measurement without a shunt resistor, the input voltage range and polarity are determined by the supply
voltage and the reference voltage, and the gain of the selected device.
3.7
Miscellaneous
The REF1 and REF2 terminals of T3 allow the user to configure the INA282-286EVM for either
unidirectional or bi-directional operation.
Two easily-accessed oscilloscope ground pads are located on the PCB to facilitate easier probing.
4
Reference Voltage Setup
The INA282-286 devices allow an external voltage signal to be used for the device’s reference voltage.
This reference voltage determines how the output responds to certain input conditions. The configurable
settings of the reference allow these devices to be used in both unidirectional and bi-directional
applications.
4.1
Unidirectional Mode
Unidirectional refers to a load current that flows in only one direction. For unidirectional applications, the
reference voltage can be set to ground or to +5V. If the reference is set to ground, the output is set at near
ground with no input voltage, and responds to input voltages that are positive with respect to VIN–/Load. If
the reference is set to +5V, the output is set near +5V with no input voltage and responds to input
voltages that are negative with respect to VIN–/Load.
In unidirectional applications that are configured to create a positive differential voltage across the device
input pins with respect to the VIN– pin, both the reference pins can be tied to ground, as shown in
Figure 10. This configuration results in an output set near to ground with no input voltage. Increasing the
differential input voltage increases the output up from the near ground output level.
REF1
REF2
Figure 10. Unidirectional Mode: Positive Differential Voltage Configuration
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In applications that are configured to create a negative differential voltage across the device input pins
with respect to the VIN– pin, both the reference pins can be tied to the supply. This configuration, as
Figure 11 illustrates, results in an output set near the supply voltage with no input voltage. Increasing the
differential input voltage decreases the output down from near the supply voltage. It is important to note,
though, that there is a limit to the level of supply voltage that is available when using this configuration. If
this configuration is used, the supply voltage cannot be greater than 9V because 9V is the voltage
limitation for the net reference voltage.
REF1
V+
REF2
V+ £ 9V
Figure 11. Unidirectional Mode: Negative Differential Voltage Configuration
4.2
Bi-directional Mode
Bi-directional refers to a load current that flows in both directions. Figure 2 shows IS flowing in both
directions. For bi-directional applications, the reference voltage can be set anywhere within the 0V to 5V
range specified for the reference input. The voltage applied to the reference pin establishes the output
voltage of the device with no input voltage. The output voltage is limited by the supply voltage, so there is
a greater available range for positive input voltages than for negative voltages because the reference
voltage is limited to the range of 0V to 5V.
The maximum range for the output of this device to accommodate a bi-directional application involves
applying 5V to the reference pin and a supply voltage of 18V. This configuration allows for a maximum
output voltage range of –4.96V/+12.6V about the 5V reference.
In bi-directional applications, the reference can be set to any voltage within the 0 and 9V range specified
for the reference input. The voltage applied to the reference pin establishes the output of the device with
no input voltage applied. With the output limited by the supply voltage and the reference voltage able to
accommodate up to 9V, however, the reference voltage can be configured to give an equal positive and
negative output range swing. The use of two reference pins allows for multiple configurations to achieve a
desired output voltage range. The most common use of the two reference pin option is to tie one
reference to the supply voltage and one pin to ground, as Figure 12 shows. The net equivalent of this
configuration (based on the internal voltage divider) is a mid-supply reference voltage.
REF1
V+
REF2
Figure 12. Bi-directional Mode: One Reference to Ground, One Reference to Supply Configuration
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Reference Voltage Setup
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If a specific voltage is required for the reference voltage, an external reference can be used, or a buffered
voltage developed from a resistor divider could be used. Figure 13 and Figure 14 illustrate these two
configurations, respectively.
V+
REF1
REF3020
2.048V
Reference
REF2
VREF £ 9V
Figure 13. Bi-directional Mode: Specific Voltage Required Configuration
V+
REF1
REF2
VREF £ 9V
Figure 14. Bi-directional Mode: Buffered Voltage Configuration
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INA282-286EVM Schematic
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5
INA282-286EVM Schematic
5.1
Schematic
Figure 15 illustrates the INA282-286EVM schematic.
T3
T4
Vin Vin +
Vout
REF2
REF1
REF1
C2
Scope GND1
Vin+
J2
0.1uF
Vin +
10
9
8
7
6
5
4
3
2
1
0.1uF
Vout
Scope GND2
5
GND2
REF2
Vout
VinVin+
REF1
GND
V+
GND1
NC
REF2
VOUT
V+
GND
4
3
2
Vin -
Vin -
1
0
REF1
R4
VIN-
C1
VIN+
0
R2
6
8
R3
7
J1
R1
V+
V+
C4
Load
1
2
3
4
5
6
7
8
2
1
2
1
1
2
3
2
1
2
1
Vout
Vin
V+
GND
REF1
REF2
V+
REF1
VinVin+
Vout
Vin
Load
T2
T1
LOGO1
INA282-286
Burr Brown Products
C3
GND3
0.1uF
LOGO2
REF2
Burr Brown Products
GND
2
1
REF2
GND
Figure 15. INA282-286EVM Schematic
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Bill of Materials
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Bill of Materials
Table 2 provides the parts list for the INA282-286EVM.
Table 2. INA282-286EVM Bill of Materials
Count
RefDes
Value
Optional/
Not Installed
R1
N/A
Optional/
Not Installed
R2
N/A
Resistor, 0603-1206/Through-Hole
2
R3, R4
0Ω
Resistor, 0Ω, 1/8W 5%, 0603-1206/Through-Hole
Optional/
Not Installed
C1
N/A
Capacitor, 0603-1206/Through-Hole
14
Description
Capacitor, 0.1µF 50V X7R, 0603-1206/Through-Hole
Manufacturer
Part Number
Panasonic - ECG
ERJ-6GEY0R00V
3
C2, C3, C4
0.1µF
Panasonic - ECG
ECJ-1VB1H104K
4
J1, J2, J3, J4
Strip cut to size
CONN HEADER 32POS .100" SGL GOLD
Samtec
TSW-132-07-G-S
11
All Test Points
TP cut to size
CONN HEADER 32POS .100" SGL GOLD
Samtec
TSW-132-07-G-S
8
None
N/A
CONN SOCKET RCPT .014-.026 30AU
4
None
N/A
4
None
5
AMP
5050863-5
Screw, Machine, Phillips, Panhead 4-40X1/4 SS
Building
Fasteners
PMSSS 440 0025
PH
N/A
Standoffs, Hex , 4-40 Threaded, 0.500" length, 0.250" OD
Keystone
Electronics
2203
INA282DIPINA286DIP
N/A
Populated DIP-Adapter Board
Texas
Instruments
1
T2
N/A
3-Position Terminal Strip, Cage Clamp, 45°, 15A,
Dove-tailed
On Shore
Technology
ED300/3
3
T1, T3, T4
N/A
2-Position Terminal Strip, Cage Clamp, 45°, 15A,
Dove-tailed
On Shore
Technology
ED300/2
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Evaluation Board/Kit Important Notice
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations,
including product safety and environmental measures typically found in end products that incorporate such semiconductor
components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding
electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY
SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING
ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
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claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to
take any and all appropriate precautions with regard to electrostatic discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER
FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of
patents or services described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the
product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s
environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
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FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and
can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15
of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this
equipment in other environments may cause interference with radio communications, in which case the user at his own expense
will be required to take whatever measures may be required to correct this interference.
EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of of –14V to +80V; a supply voltage (Vs) range of +2.7V to +18V;
and the output voltage range of GND + 0.05V to Vs – 0.4V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than +25°C. The EVM is designed to
operate properly with certain components above +25°C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
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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
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DLP® Products
www.dlp.com
Communications and
Telecom
www.ti.com/communications
DSP
dsp.ti.com
Computers and
Peripherals
www.ti.com/computers
Clocks and Timers
www.ti.com/clocks
Consumer Electronics
www.ti.com/consumer-apps
Interface
interface.ti.com
Energy
www.ti.com/energy
Logic
logic.ti.com
Industrial
www.ti.com/industrial
Power Mgmt
power.ti.com
Medical
www.ti.com/medical
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
RFID
www.ti-rfid.com
Space, Avionics &
Defense
www.ti.com/space-avionics-defense
RF/IF and ZigBee® Solutions www.ti.com/lprf
Video and Imaging
www.ti.com/video
Wireless
www.ti.com/wireless-apps
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2010, Texas Instruments Incorporated
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