LM4931

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 26mW_RMS to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when AV_DD = 3.3V_DC. The mono speaker amplifier delivers up to 570mW_RMS into an 8Ω load with less than 1% distortion when AV_DD = 3.3V_DC.

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.