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National Semiconductor Introduces Integrated Audio Subsystem to Support Both Voice and Digital Audio in Portable Devices

National’s LM4930 Integrates Key Digital Audio System Functions Into a Single 36-Bump micro SMD Package

Sep 2, 2003

September 2, 2003 - National Semiconductor Corporation (NYSE:NSM) today announced a single-chip analog audio subsystem for mobile phones and other portable applications that offers designers an easy-to-use structure and three digital interfaces.  Integrated onto a single 36-bump micro SMD package, these interfaces include pulse code modulation (PCM) for digital voice data, I2S for digital stereo audio from sources such as MP3, and an I2C interface.  The I2C digital control interface sets the mode of operation, volume levels and other functions.

“National Semiconductor’s highly-integrated audio subsystem uses simple interfaces currently present in portable consumer devices,” said Ken Boyce, marketing director for National Semiconductor’s audio products group.  “National’s LM4930 serves the needs of portable equipment manufacturers as they continue to expand multimedia feature sets and require voice and digital audio system support.”

National’s LM4930 Boomer® audio subsystem contains a stereo I2S DAC, a voiceband codec, stereo headphone amplifier, mono speaker amplifier, microphone pre-amplifier and a sidetone generator, all with I2C control.  I2C control allows selection from a variety of operating modes that determine which amplifiers are used, volume control for each amplifier, and other performance options.

About National’s Audio Portfolio
With a leading market share in audio amplifiers for cellular handsets, National delivers audio solutions to nearly every handset maker in the world.  In addition to providing chips for cellular handsets, National manufactures Class AB and Class D audio amplifiers for consumer stereo and home theater systems, and headphone and speaker drivers in notebook computers and portable audio devices.   For more information on National’s audio products, visit http://www.national.com/appinfo/audio/

Pricing and Availability
The LM4930 is available now in 36-bump micro SMD packaging and is priced at $3.95 in 1,000-unit quantities.  More information on the LM4930 is available at http://www.national.com/pf/LM/LM4930.html
.  For more information on National’s audio products, visit http://www.national.com/appinfo/audio/.  To view a high-resolution downloadable photo of these products, visit National's photo gallery at  http://www.national.com/company/pressroom/gallery/audio.html.

About National Semiconductor
National Semiconductor is the premier analog company driving the information age. Combining real-world analog and state-of-the-art digital technology, the company is focused on analog-based semiconductor products, which include stand-alone devices and subsystems in the areas of power management, imaging, display drivers, audio, amplifiers and data conversion. The company targets key markets such as wireless, displays, PCs, networks and a broad range of portable applications. With headquarters in Santa Clara, California, National reported sales of $1.67 billion for its most recent fiscal year. Additional company and product information is available on the World Wide Web at www.national.com