LM4931 - National Semiconductor

LM4931 Audio Subsystem

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.

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, a.