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National Semiconductor Introduces Simple-to-Use Boomer Audio-Synchronized LED Driver

National Enables Automatic Audio-Synchronized Fun Lighting: Lights Move to the Music in Cell Phones and Other Portable Devices, Without Software Programming

May 2, 2005

May 2, 2005 - National Semiconductor Corporation (NYSE:NSM) today introduced a “no-programming-required” Boomer® audio-synchronized light emitting diode (LED) driver.  Previous designs required pre-programmed I2C compatible code to control lighting patterns.  National’s LM4970 gives designers the option of using I2C compatible pattern control or choosing automatic audio-synchronized pattern generation. If the automatic mode is used, no software or memory storage is needed for pattern control, freeing up memory storage space for other features.  The I2C compatible control bus is also used to turn each driver on or off, provide flexibility for controlling the brightness of the LED, as well as the ability to change the high and mid-range frequency bands.  The internal control features reduce the number of external components, optimizing board space in small form factor applications such as cell phones, MP3 players, PDAs and other portable devices.

"LED entertainment is a hot new feature for phones and portable music,” said Mike Polacek, vice president of National Semiconductor’s Audio group.  “National’s ‘no-programming-required’ LM4970 makes it easier for customers to implement audio LED synchronization into just about any design.  In addition to being easy to design in, the product is tiny and offers low power consumption, a perfect combination for products ranging from cell phones to educational toys.”

Lighting up Audio
National’s LM4970 is an audio-synchronized LED driver that eliminates the need for real-time software processing for LED lighting effects.  The audio-synchronization mode allows three audio inputs to be mixed and filtered into three frequency bands, with each frequency band assigned to a specific pulse width modulated (PWM) LED driver.  It includes three individual PWM color LED drivers that provide up to 42mA of current drive for each LED output. The drivers can also be directly programmed through an I2C compatible interface for applications where user-defined LED pattern, color, and intensity programmability is a priority.  The LM4970 also features a brightness control that allows the user to set the intensity of each LED to the desired level.  When used in portable systems with one of National’s Boomer audio subsystems, such as the LM4857, users will experience high-quality stereo audio in 3D and fun lighting that moves with the music.

About National’s Audio Portfolio
National Semiconductor works with every major handset maker in the world and is the leading provider of audio amplifier systems for the cell phone market.  The company’s line of Boomer audio amplifiers enhances and enriches the entire range of sound – from voice to ring sounds and music – that can be amplified in a mobile phone.  National manufactures Class AB and Class D mono and stereo speaker amplifiers, mono and stereo headphone amplifiers, and audio subsystems for desktop and notebook computers, multimedia displays and portable electronic devices.  The company also offers its higher-power Overture® amplifiers for consumer stereo and home theater systems.  For more information on National’s audio products, visit http://audio.national.com

Pricing and Availability
Available now in a 14-pin LLP® package, the LM4970 is priced at $0.90 in 1,000-unit quantities.  Lead-free package options are also available.  More information on the LM4970 is available at http://www.national.com/pf/LM/LM4970.html
. A large selection of audio amplifiers is supported by National’s WEBENCH® online design tool.  To explore these solutions, visit http://webench.national.com.  To learn about high-performance audio amplifiers for portable applications, visit National’s library of online seminars.

Note to editors: To view a high-resolution downloadable photo of the new products, visit National's photo gallery.

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high-performance analog devices and subsystems.  National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, communication interface products and data conversion solutions. National's key markets include wireless handsets, displays, PCs and laptops.  The company's analog products are also optimized for numerous applications in a variety of electronics markets, including medical, automotive, industrial, and test and measurement.  Headquartered in Santa Clara, California, National reported sales of $1.98 billion for fiscal 2004, which ended May 30, 2004.  Additional company and product information is available at