LM4931 Datasheet | National Semiconductor

Description 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 patible interface for control. The full range music path features an SNR of 86d B with an 18-bit 48k Hz input. The headphone amplifier delivers at least 26m WRMS 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 570m WRMS 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 ponents. It is therefore ideally suited for mobile phone and other low voltage applications where minimal power consumption, PCB area, and cost are primary requirements. Key Specifications j PLS j PLS OUT at AVDD = 5V, 8Ω 1.1W (typ) 570m W (typ) 26m W (typ) 2.7V to 4.0V 2.7V to 5.0V 1.1µA (typ) 62d B (typ) 75d B (typ) 86d B (typ) at AVDD = 3.3V, 8Ω at AVDD = 5V & AVDD = 3.3V, 32Ω 1% THD+N 1% THD+N j PH/P 1% THD+N j Supply voltage range DVDD AVDD (Note 8) j Shutdown current j PSRR at 217Hz, AVDD = 3V j SNR (Voice Codec) j SNR (Audio DAC) Features n 18-bit 44.1k Hz or 48k Hz stereo DAC n 16-bit 8k Hz , 12k Hz , 16k Hz, or 24k Hz voice-band codec n PLL for operation from mon system clocks n Either I2C or SPI patible serial interface n I2S digital audio data serial interface n PCM voice audio data serial interface n Differential analog microphone input n 26m...