The LM4931 is an integrated audio subsystem that supports voice and digital audio
functions. The LM4931 includes a high quality stereo DAC, voice band codec, a stereo headphone
amplifier and a high-power high efficiency mono speaker amplifier. It is primarily designed for
demanding applications in mobile phones and other portable devices.
The LM4931 features an I2S serial interface for full range
audio, a 16-bit PCM bi-directional serial interface for the voice band codec and an
I2C/SPI compatible interface for control. The full range music path
features an SNR of 86dB with an 18-bit 48kHz input. The headphone amplifier delivers at least
26mWRMS to a 32Ω single-ended stereo load with less than 1% distortion
(THD+N) when AVDD = 3.3VDC. The mono speaker
amplifier delivers up to 570mWRMS into an 8Ω load with less than 1%
distortion when AVDD = 3.3VDC.
The LM4931 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,
PCB area, and cost are primary requirements.
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