Audio subsystem eases portable product design
The LM49352 mixed-signal audio subsystem integrates audio codec functionality with ground-referenced headphone amplifiers, earpiece driver, Class D loudspeaker, and audio DSP in a 3.3 x 3.3-mm package. The loudspeaker delivers 93% efficiency at 970 mW from a 4.2-V supply, while the headphone amplifier offers 18-mW MP3 playback to extend battery life.
The device features a dual bidirectional I2 S interface and PCM audio bridge to enable easy interface to peripherals such as Bluetooth modules, as well as an I2 C-compatible interface for programming different gains and modes. Its stereo ADC provides a SNR of 97 dB with a 24-bit 48-kHz signal, and the DAC provides an SNR of 103 dB with a 24-bit 48-kHz signal. The loudspeaker amplifier delivers up to 970 mW to an 8-Ω load with less than 1% THD+N at 4.2 V. ($7.55 ea/1,000 — available now.)
National Semiconductor , Santa Clara , CA
Sales 800-272-9959
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