Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
EE Times-Asia > Embedded

Audio subsystems aim to simplify design

Posted: 03 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:audio subsystem? portable design product? audio Class D?

National Semiconductor Corp. has expanded its line of low-power Boomer Class D audio subsystems with two devicesthe LM49352 mixed-signal audio subsystem and LM49151 analog subsystemaimed at simplifying portable product design.

The LM49352 and LM49151 are targeted at smart phones, full-featured phones, portable gaming devices and portable GPS devices. The LM49352 mixed-signal audio subsystem integrates audio codec functionality with ground-referenced headphone amplifiers, earpiece driver, Class D loudspeaker and audio DSP in one miniature 3.3mm x 3.3mm package. The loudspeaker delivers high efficiency (93 percent at 970mW from a 4.2V supply), while the headphone amplifier offers low-power (18mW) MP3 playback to extend battery life.

The LM49151 analog subsystem integrates an earpiece driver, Class D loudspeaker, ground-referenced headphone amplifiers and automatic level control (ALC) in an ultra-small 2.2mm x 2.6mm package. According to National, the LM49151 offers the lowest power in its class, consuming 7.3mA of quiescent current at 3.3V for the loudspeaker and headphone. The subsystem's ALC feature provides handset manufacturers with a variety of options to control audio distortion levels and prevent speaker damage.

The LM49352 and LM49151 are now available. In 1,000-unit quantities, the LM49352 is priced at $7.55 each and the LM49151 at $1.60 each.

- Ismini Scouras

Article Comments - Audio subsystems aim to simplify des...
*? You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.

Back to Top