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Highly-integrated 3D-Boomer audio amps tout amazing-sound

Posted: 29 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? boomer audio amplifier? amplifier? lm4845? lm4888?

National Semiconductor Corp. unveiled two Boomer audio amps for cellphones and portable applications that are said to provide outstanding sound quality and high integration.

The new LM4845 audio subsystem contains a mono amplifier and stereo headphone amplifier. The mono amp delivers 500mW of power into a mono 8-ohm bridge-tied load with one percent total harmonic distortion plus noise (THD+N) from a 3.3V power supply. The stereo headphone amplifier delivers 25mW per channel of continuous average power into a stereo 32-ohm load with one percent THD+N from a 3.3V power supply.

The LM4888 is a dual bridge-connected audio power amplifier which, when connected to a 5V supply, will deliver 2.1W to a 4-ohm load or 2.4W to a 3-ohm load with less than 1 percent THD+N.

A user-selectable 3D enhancement mode provides enhanced stereo imaging. The amplifier also has two separate headphone enable inputs, each having different logic level thresholds. To simplify audio system design, the LM4888 combines dual bridge speaker amplifiers and stereo headphone amplifiers on one chip.

"As today's portable devices get smaller and smaller, National's LM4845 and LM4888 provide the integration that makes it possible to deliver additional features, such as camera phones with audio, MP3 players and FM radios, in a compact package," said Mike Polacek, VP of National Semiconductor's Audio group.

Available now in a 25-bump micro SMD package, the LM4845 is priced at $2.50 and the LM4888 is available in a 25-lead LLP package and is priced at $1.50, both in 1,000-unit quantities.

- Bettyann Liotta


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