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Stereo headphone amplifier doubles audio playback time for portables

Santa Clara, Calif.—National Semiconductor Corp.'s latest PowerWise stereo headphone amplifier draws 0.9 mA (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 increases audio (MP3, mobile TV, etc.) playback time with its adaptive power supply approach that enables very low supply rails. As a result, power-efficiency is doubled compared to typical Class AB headphone amplifiers, the company said.

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 ultra-small, 16-bump, 1.7 mm by 1.7 mm, 0.4 mm-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 includes a 32-step I² C compatible volume control with mute and delivers 37 mW per channel into a 16-Ohm load with less than one percent total harmonic distortion plus noise (THD+N) at 3.6V.

The LM48824's high power supply rejection ratio (PSRR) of 105 dB at 217 Hz 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.

Pricing: $1.06 each in 1,000-unit quantities.
Availability: Now.

Datasheet: click here.

National Semiconductor, www.national.com

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