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Amp doubles playback time in portable apps

Posted: 16 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:headphone stereo amplifier? playback time double? portable application?

LM48824 headphone amp

National Semiconductor Corp. has launched a new PowerWise stereo headphone amplifier that draws only 0.9mA (typical) of quiescent current to double the audio playback time of smart phones, full-featured mobile phones and portable music players.

The LM48824's Class G architecture significantly increases audio (MP3, mobile TV, etc.) playback time with its adaptive power supply approach that enables very low supply rails, which doubles the power-efficiency compared to typical Class AB headphone amplifiers. Additionally, the LM48824's output noise created by ground mismatches is improved through common-mode sensing that corrects for differences between the amplifier ground and the headphone return terminal.

The LM48824 is offered in an ultrasmall, 16-bump, 1.7mm x 1.7mm, 0.4mm pitch micro SMD package. It features National's ground-referenced architecture, which saves space and minimizes system cost by eliminating the need for bulky and expensive DC blocking capacitors. The LM48824 also includes a 32-step I?C compatible volume control with mute and delivers 37mW per channel into a 16? load with less than one percent total harmonic distortion plus noise (THD+N) at 3.6V.

The LM48824's high power supply rejection ratio of 105dB at 217Hz enables the device to operate in noisy environments without additional power supply conditioning. Its high-output impedance mode allows the LM48824's outputs to be driven by an external source without degrading the signal.

Available now, the LM48824 is priced at $1.60 each in 1,000-unit quantities.

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