LM4941SD/NOPB - NATIONAL SEMICONDUCTOR

LM4941

LM4941 1.25 Watt Fully Differential Audio Power Amplifier With RF

Suppressionand Shutdown

Literature Number: SNAS347B

March 2007

LM4941

1.25 Watt Fully Differential Audio Power Amplifier With RF

Suppression and Shutdown

General Description

The LM4941 is a fully differential audio power amplifier pri-

marily designed for demanding applications in mobile phones

and other portable communication device applications. It is

capable of delivering 1.25 watts of continuous average power

to a 8Ω load with less than 1% distortion (THD+N) from a

5VDC power supply. The LM4941 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for mobile phone and other small form factor

applications where minimal PCB space is a primary require-

ment.

The LM4941 also features proprietary internal circuitry that

suppresses the coupling of RF signals into the chip. This is

important because certain types of RF signals (such as GSM)

can couple into audio amplifiers in such a way that part of the

signal is heard through the speaker. The RF suppression cir-

cuitry in the LM4941 makes it well-suited for portable appli-

cations in which strong RF signals generated by an antenna

from or a cellular phone or other portable electronic device

may couple audibly into the amplifier.

Other features include a low-power consumption shutdown

mode, internal thermal shutdown protection, and advanced

pop & click circuitry.

Key Specifications

■ Improved PSRR at 217Hz 95dB (typ)

■ Power Output, VDD = 5.0V,

RL = 8Ω, 1% THD+N 1.25W (typ)

■ Power Output, VDD = 3.0V,

RL = 8Ω, 1% THD+N 430mW (typ)

■ Shutdown Current 0.1µA (typ)

Features

■Improved RF suppression, by up to 20dB over previous

designs in selected applications

■Fully differential amplification

■Available in space-saving micro SMD package

■Ultra low current shutdown mode

■Can drive capacitive loads up to 100pF

■Improved pop & click circuitry eliminates noises during

turn-on and turn-off transitions

■2.4 - 5.5V operation

■No output coupling capacitors, snubber networks or

bootstrap capacitors required

Applications

■Mobile phones

■PDAs

■Portable electronic devices

Typical Application

20170366

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer® is a registered trademark of National Semiconductor Corporation.

LM4941 1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown

Connection Diagrams

9 Bump micro SMD Package

20170304

Top View

Order Number LM4941TM

See NS Package Number TMD09AAA

micro SMD Markings

20170302

Top View

X = Date Code

V = Die Traceability

G = Boomer Family

H6 = LM4941TM

LLP Package

20170325

Top View

Order Number LM4941SD

See NS Package Number SDA08C

LLP Markings

20170326

Top View

XY = Date Code

TT = Die Run Traceability

4941 = LM4941SD

www.national.com 2

LM4941

Absolute Maximum Ratings (Notes 1, 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage 6.0V

Storage Temperature −65°C to +150°C

Input Voltage −0.3V to VDD +0.3V

Power Dissipation (Note 3) Internally Limited

ESD Susceptibility (Note 4) 2000V

ESD Susceptibility (Note 5) 200V

Junction Temperature 150°C

Thermal Resistance

θJA (TM) 100°C/W

θJA (LLP) 71°C/W

Soldering Information

See AN-1187

Operating Ratings

Temperature Range

TMIN ≤ TA ≤ TMAX −40°C ≤ TA ≤ 85°C

Supply Voltage 2.4V ≤ VDD ≤ 5.5V

Electrical Characteristics VDD = 5V (Notes 1, 2)

Symbol Parameter Conditions

LM4941 Units

(Limits)

Typical Limit

(Note 6) (Notes 7, 8)

IDD Quiescent Power Supply Current VIN = 0V, no load

VIN = 0V, RL = 8Ω

1.7

2.3 mA (max)

ISD Shutdown Current VSHDN = GND 0.1 0.8 µA (max)

POOutput Power

THD+N = 1% (max); f = 1 kHz

RL = 8Ω 1.25 1.15 W (min)

THD+N = 10% (max); f = 1 kHz

RL = 8Ω 1.54

THD+N Total Harmonic Distortion + Noise PO = 0.7 W; f = 1kHz 0.04 %

PSRR Power Supply Rejection Ratio

VRIPPLE = 200mVP-P Sine

f = 217Hz (Note 9) 95 80 dB (min)

f = 1kHz (Note 9) 90 dB

CMRR Common-Mode Rejection Ratio f = 217Hz, VCM = 200mVP-P Sine 70 dB

f = 20Hz–20kHz , VCM = 200mVpp 70 dB

VOS Output Offset Voltage VIN = 0V 2 6 mV (max)

VSDIH Shutdown Voltage Input High 1.4 V (min)

VSDIL Shutdown Voltage Input Low 0.4 V (max)

SNR Signal-to-Noise Ratio PO = 1W, f = 1kHz 108 dB

TWU Wake-up Time from Shutdown CBYPASS = 1μF12 ms

3 www.national.com

LM4941

Electrical Characteristics VDD = 3V

Symbol Parameter Conditions

LM4941 Units

(Limits)

Typical Limit

(Note 6) (Notes 7, 8)

IDD Quiescent Power Supply Current VIN = 0V, no load

VIN = 0V, RL = 8Ω

1.6

2.2 mA (max)

ISD Shutdown Current VSHDN = GND 0.1 0.8 µA (max)

POOutput Power

THD+N = 1% (max); f = 1 kHz

RL = 8Ω 0.43

THD+N = 10% (max); f = 1 kHz

RL = 8Ω 0.54

THD+N Total Harmonic Distortion + Noise PO = 0.25W; f = 1kHz 0.05 %

PSRR Power Supply Rejection Ratio

VRIPPLE = 200mVPP Sine

f = 217Hz (Note 9) 95 dB

f = 1kHz (Note 9) 90 dB

CMRR Common-Mode Rejection Ratio f = 217Hz, VCM = 200mVPP Sine 70 dB

VOS Output Offset Voltage VIN = 0V 2 6 mV (max)

VSDIH Shutdown Voltage Input High 1.4 V (min)

VSDIL Shutdown Voltage Input Low 0.4 V (max)

TWU Wake-up Time from Shutdown CBYPASS = 1μF8 ms

Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.

Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions

which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters

where no limit is given, however, the typical value is a good indication of device performance.

Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature TA. The maximum

allowable power dissipation is PDMAX = (TJMAX – TA) / θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4941, see power

derating curve for additional information.

Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.

Note 5: Machine Model, 220pF – 240pF discharged through all pins.

Note 6: Typicals are measured at 25°C and represent the parametric norm.

Note 7: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).

Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Note 9: 10Ω terminated input.

Note 10: Data taken with Bandwidth = 80kHz, AV = 1V/V and inputs are AC-coupled except where specified.

Note 11: Maximum Power Dissipation (PDMAX) in the device occurs at an output power level significantly below full output power. PDMAX can be calculated using

Equation 3 shown in the Application section. It may also be obtained from the Power Dissipation graphs.

External Components Description

(Figure 1)

Components Functional Description

1. CSSupply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing section for

information concerning proper placement and selection of the supply bypass capacitor.

2. CBBypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External

Components, for information concerning proper placement and selection of CB.

3. RiInverting input resistance which sets the closed-loop gain in conjunction with RF.

4. RFExternal feedback resistance which sets the closed-loop gain in conjunction with Ri.

www.national.com 4

LM4941

Typical Performance Characteristics (Note 10)

THD+N vs Output Power

VDD = 5V, RL = 8Ω, f = 1kHz

20170367

THD+N vs Output Power

VDD = 3V, RL = 8Ω, f = 1kHz

20170368

THD+N vs Frequency

VDD = 5V, RL = 8Ω, PO = 700mW

20170369

THD+N vs Frequency

VDD = 3V, RL = 8Ω, PO = 250mW

20170370

PSRR vs Frequency

VDD = 5V, RL = 8Ω, Inputs terminated

20170371

PSRR vs Frequency

VDD = 3V, RL = 8Ω, Inputs terminated

20170372

5 www.national.com

LM4941

CMRR vs Frequency

VDD = 5V, RL = 8Ω

20170373

CMRR vs Frequency

VDD = 3V, RL = 8Ω

20170374

PSRR vs Common Mode Voltage

VDD = 5V, RL = 8Ω, f = 217Hz

20170323

PSRR vs Common Mode Voltage

VDD = 3V, RL = 8Ω, f = 217Hz

20170324

Power Dissipation vs Output Power

VDD = 5V, RL = 8Ω

20170315

Power Dissipation vs Output Power

VDD = 3V, RL = 8Ω

20170316

www.national.com 6

LM4941

Output Power vs Supply Voltage

RL = 8Ω, Top-THD+N = 10%; Bot-THD+N = 1%

20170317

Clipping Voltage vs Supply Voltage

20170318

Output Power vs Load Resistance

Top-VDD = 5V, 10% THD+N, Topmid-VDD = 5V, 1% THD+N

Bot-VDD = 3V, 10% THD+N, Botmid-VDD = 3V, 1% THD+N

20170319

IDDQ vs Supply Voltage

20170382

Power Derating Curve

fIN = 1kHz, RL = 8Ω

20170328

7 www.national.com

LM4941

Application Information

OPTIMIZING RF IMMUNITY

The internal circuitry of the LM4941 suppresses the amount

of RF signal that is coupled into the chip. However, certain

external factors, such as output trace length, output trace ori-

entation, distance between the chip and the antenna, antenna

strength, speaker type, and type of RF signal, may affect the

RF immunity of the LM4941. In general, the RF immunity of

the LM4941 is application specific. Nevertheless, optimal RF

immunity can be achieved by using short output traces and

increasing the distance between the LM4941 and the anten-

na.

DIFFERENTIAL AMPLIFIER EXPLANATION

The LM4941 is a fully differential audio amplifier that features

differential input and output stages. Internally this is accom-

plished by two circuits: a differential amplifier and a common

mode feedback amplifier that adjusts the output voltages so

that the average value remains VDD / 2. When setting the dif-

ferential gain, the amplifier can be considered to have

"halves". Each half uses an input and feedback resistor (Ri

and RF) to set its respective closed-loop gain (see Figure 1).

With Ri1 = Ri2 and RF1 = RF2, the gain is set at -RF / Ri for each

half. This results in a differential gain of

AVD = -RF/Ri(1)

It is extremely important to match the input resistors to each

other, as well as the feedback resistors to each other for best

amplifier performance. See the Proper Selection of Exter-

nal Components section for more information. A differential

amplifier works in a manner where the difference between the

two input signals is amplified. In most applications, input sig-

nals will be 180° out of phase with each other. The LM4941

can be used, however, as a single-ended input amplifier while

still retaining its fully differential benefits because it simply

amplifies the difference between the inputs.

All of these applications provide what is known as a "bridged

mode" output (bridge-tied-load, BTL). This results in output

signals that are 180° out of phase with respect to each other.

Bridged mode operation is different from the single-ended

amplifier configuration that connects the load between the

amplifier output and ground. A bridged amplifier design has

distinct advantages over the single-ended configuration: it

provides differential drive to the load, thus doubling maximum

possible output swing for a specific supply voltage. Four times

the output power is possible compared with a single-ended

amplifier under the same conditions. This increase in attain-

able output power assumes that the amplifier is not current

limited or clipped. In order to choose an amplifier's closed-

loop gain without causing excess clipping, please refer to the

Audio Power Amplifier Design section.

A bridged configuration, such as the one used in the LM4941,

also creates a second advantage over single-ended ampli-

fiers. Since the differential outputs are biased at half-supply,

no net DC voltage exists across the load. This assumes that

the input resistor pair and the feedback resistor pair are prop-

erly matched (see Proper Selection of External Compo-

nents). BTL configuration eliminates the output coupling

capacitor required in single-supply, single-ended amplifier

configurations. If an output coupling capacitor is not used in

a single-ended output configuration, the half-supply bias

across the load would result in both increased internal IC

power dissipation as well as permanent loudspeaker dam-

age. Further advantages of bridged mode operation specific

to fully differential amplifiers like the LM4941 include in-

creased power supply rejection ratio, common-mode noise

reduction, and click and pop reduction.

POWER DISSIPATION

Power dissipation is a major concern when designing a suc-

cessful amplifier, whether the amplifier is bridged or single-

ended. Equation 2 states the maximum power dissipation

point for a single-ended amplifier operating at a given supply

voltage and driving a specified output load.

PDMAX = (VDD)2 / (2π2RL) Single-Ended (2)

However, a direct consequence of the increased power de-

livered to the load by a bridge amplifier is an increase in

internal power dissipation versus a single-ended amplifier op-

erating at the same conditions.

PDMAX = 4 * (VDD)2 / (2π2RL) Bridge Mode (3)

Since the LM4941 has bridged outputs, the maximum internal

power dissipation is four times that of a single-ended ampli-

fier. Even with this substantial increase in power dissipation,

the LM4941 does not require additional heatsinking under

most operating conditions and output loading. From Equation

3, assuming a 5V power supply and an 8Ω load, the maximum

power dissipation point is 625mW. The maximum power dis-

sipation point obtained from Equation 3 must not be greater

than the power dissipation results from Equation 4:

PDMAX = (TJMAX - TA) / θJA (4)

The LM4941's θJA in an TMD09AAA package is 100°C/W.

Depending on the ambient temperature, TA, of the system

surroundings, Equation 4 can be used to find the maximum

internal power dissipation supported by the IC packaging. If

the result of Equation 3 is greater than that of Equation 4, then

either the supply voltage must be decreased, the load

impedance increased, the ambient temperature reduced, or

the θJA reduced with heatsinking. In many cases, larger traces

near the output, VDD, and GND pins can be used to lower the

θJA. The larger areas of copper provide a form of heatsinking

allowing higher power dissipation. For the typical application

of a 5V power supply, with an 8Ω load, the maximum ambient

temperature possible without violating the maximum junction

temperature is approximately 87.5°C provided that device

operation is around the maximum power dissipation point.

Recall that internal power dissipation is a function of output

power. If typical operation is not around the maximum power

dissipation point, the LM4941 can operate at higher ambient

temperatures. Refer to the Typical Performance Charac-

teristics curves for power dissipation information.

POWER SUPPLY BYPASSING

As with any power amplifier, proper supply bypassing is crit-

ical for low noise performance and high power supply rejec-

tion ratio (PSRR). The capacitor location on both the bypass

and power supply pins should be as close to the device as

possible. Typical applications employ a 5V regulator with

10µF and 0.1µF bypass capacitors that increase supply sta-

www.national.com 8

LM4941

bility. This, however, does not eliminate the need for bypass-

ing the supply nodes of the LM4941. The LM4941 will operate

without the bypass capacitor CB, although the PSRR may de-

crease. A 1µF capacitor is recommended for CB. This value

maximizes PSRR performance. Lesser values may be used,

but PSRR decreases at frequencies below 1kHz. The issue

of CB selection is thus dependant upon desired PSRR and

click and pop performance as explained in the section Proper

Selection of External Components.

SHUTDOWN FUNCTION

In order to reduce power consumption while not in use, the

LM4941 contains shutdown circuitry that is used to turn off the

amplifier's bias circuitry. The device may then be placed into

shutdown mode by toggling the SHDN pin to logic low. It is

best to switch between ground and supply for maximum per-

formance. While the device may be disabled with shutdown

voltages in between ground and supply, the idle current may

be greater than the typical value of 0.1µA. In either case, the

SHDN pin should be tied to a definite voltage to avoid un-

wanted state changes.

In many applications, a microcontroller or microprocessor

output is used to control the shutdown circuitry, which pro-

vides a quick, smooth transition to shutdown. Another solution

is to use a single-throw switch in conjunction with an external

pull-up resistor. This scheme guarantees that the shutdown

pin will not float, thus preventing unwanted state changes.

PROPER SELECTION OF EXTERNAL COMPONENTS

Proper selection of external components in applications using

integrated power amplifiers is critical when optimizing device

and system performance. Although the LM4941 is tolerant to

a variety of external component combinations, consideration

of component values must be made when maximizing overall

system quality.

The LM4941 is unity-gain stable, giving the designer maxi-

mum system flexibility. The LM4941 should be used in low

closed-loop gain configurations to minimize THD+N values

and maximize signal to noise ratio. Low gain configurations

require large input signals to obtain a given output power. In-

put signals equal to or greater than 1VRMS are available from

sources such as audio codecs. When used in its typical ap-

plication as a fully differential power amplifier the LM4941

does not require input coupling capacitors for input sources

with DC common-mode voltages of less than VDD. Exact al-

lowable input common-mode voltage levels are actually a

function of VDD, Ri, and RF and may be determined by Equa-

tion 5:

VCMi < (VDD-1.2)(Ri+RF)/RF-VDD/2(Ri/ RF) (5)

-RF / Ri = AVD (6)

When using DC coupled inputs, special care must be taken

to match the values of the input resistors (Ri1 and Ri2) to each

other. Because of the balanced nature of differential ampli-

fiers, resistor matching differences can result in net DC cur-

rents across the load. This DC current can increase power

consumption, internal IC power dissipation, reduce PSRR,

and possibly damaging the loudspeaker. The chart below

demonstrates this problem by showing the effects of differing

values between the feedback resistors while assuming that

the input resistors are perfectly matched. The results below

apply to the application circuit shown in Figure 1, and as-

sumes that VDD = 5V, RL = 8Ω, and the system has DC

coupled inputs tied to ground.

Tolerance Ri1 Ri2 V01–V02 ILOAD

20% 0.8R 1.2R –0.500V 62.5mA

10% 0.9R 1.1R –0.250V 31.25mA

5% 0.95R 1.05R –0.125V 15.63mA

1% 0.99R 1.01R –0.025V 3.125mA

0% R R 0 0

Since the same variations can have a significant effect on

PSRR and CMRR performance, it is highly recommended

that the input resistors be matched to 1% tolerance or better

for best performance.

9 www.national.com

LM4941

Recommended TM Board Layout

20170321

Recommended TM Board Layout: Top Layer

20170322

Recommended TM Board Layout: Top Overlay

20170320

Recommended TM Board Layout: Bottom Layer

www.national.com 10

LM4941

Recommended LLP Board Layout

20170376

Recommended LLP Board Layout: Top Layer

20170375

Recommended LLP Board Layout: Top Overlay

20170377

Recommended LLP Board Layout: Bottom Layer

11 www.national.com

LM4941

LM4941 Reference Design Boards

Bill Of Materials

Designator Value Tolerance Part Description Comments

Ri1, Ri2 20kΩ0.10% 1/10W, 0.1% 0805 Resistor

Rf1, Rf2 20kΩ0.10% 1/10W, 0.1% 0805 Resistor

Ci1, Ci2 0Ω 1/10W, 0.1% 0805 Resistor

Cb, Cs 1μF10% 16V Tantalum 1210 Capacitor

In, Out, VDD, J1 0.100” 1x2 header, Vertical mount Input, Output, VDD/GND, Shutdown

Control

www.national.com 12

LM4941

Revision History

Rev Date Description

1.0 06/28/06 Initial release.

1.1 07/10/06 Added the LLP pkg mktg outline (per Kashif J.)

1.2 08/04/06 Added the LLP package and marking diagrams.

1.3 10/12/06 Edited some of the Typical Performance curves' labels and some text edits.

1.4 10/25/06 Added the LLP boards.

1.5 11/07/06 Text edits.

1.6 11/15/06 Replaced curve 20170381 with 20170382 and input text edits.

1.7 03/09/07 Changed the Limit value from 70 to 80 on the PSRR in the EC 5V EC table.

13 www.national.com

LM4941

Physical Dimensions inches (millimeters) unless otherwise noted

micro SMD Package

Order Number LM4941TM

NS Package Number TMD09AAA

X1 = 1.25mm X2 = 1.25mm X3 = 0.6mm

LLP Package

Order Number LM4941SD

NS Package Number SDA08C

www.national.com 14

LM4941

Notes

15 www.national.com

LM4941

Notes

LM4941 1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown

THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION

(“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY

OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO

SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS,

IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS

DOCUMENT.

TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT

NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL

PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR

APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND

APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE

NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS.

EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO

LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE

AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR

PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY

RIGHT.

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR

SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and

whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected

to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform

can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness.

National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other

brand or product names may be trademarks or registered trademarks of their respective holders.

For the most current product information visit us at www.national.com

National Semiconductor

Americas Customer

Support Center

Email:

new.feedback@nsc.com

Tel: 1-800-272-9959

National Semiconductor Europe

Customer Support Center

Fax: +49 (0) 180-530-85-86

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 69 9508 6208

English Tel: +49 (0) 870 24 0 2171

Français Tel: +33 (0) 1 41 91 8790

National Semiconductor Asia

Pacific Customer Support Center

Email: ap.support@nsc.com

National Semiconductor Japan

Customer Support Center

Fax: 81-3-5639-7507

Email: jpn.feedback@nsc.com

Tel: 81-3-5639-7560

www.national.com

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 www.ti.com/video

RFID www.ti-rfid.com

OMAP Mobile Processors www.ti.com/omap

Wireless Connectivity www.ti.com/wirelessconnectivity

TI E2E Community Home Page e2e.ti.com

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265