The LM4930 is an integrated audio subsystem that supports voice and digital audio
functions. The LM4930 includes a high quality I2S input stereo DAC, a
voice band codec, a stereo headphone amplifier and a high-power mono speaker amplifier. It is
primarily designed for demanding applications in mobile phones and other portable devices.
The LM4930 features an I2S serial interface for full range
audio, a 16-bit PCM bi-directional serial interface for the voice band codec and an two-wire
interface for control. The full range music path features an SNR of 86dB with a 16-bit 48kHz input.
The stereo DAC can also be used while the voice codec is in use. The headphone amplifier delivers
25mWRMS to a 32Ω single-ended stereo load with less than 0.5% distortion
(THD+N) when AVDD = 3V. The mono speaker amplifier delivers up to 330mW into
an 8Ω load with less than 1% distortion when AVDD = 3V.
The LM4930 employs advanced techniques to reduce power consumption, to reduce controller
overhead and to eliminate click and pop. Boomer audio power amplifiers were designed specifically
to provide high quality output power with a minimal amount of external components. It is,
therefore, ideally suited for mobile phone and other low voltage applications where minimal power
consumption is a primary requirement.
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