LM49352 Datasheet | National Semiconductor Corporation

LM49352 PRODUCT BRIEF LM49352 PRODUCT BRIEF .. PRELIMINARY March 24, 2009 Mono Class D Audio Codec Subsystem with Ground Referenced Headphone Amplifiers, Earpiece Driver, and Audio DSP 1.0 General Description The LM49352 is a high performance mixed signal audio subsystem. The LM49352 includes a high quality stereo DAC, a high quality stereo ADC, a stereo headphone amplifier, which supports True Ground operation, a low EMI Class D loudspeaker amplifier, and an earpiece speaker amplifier. It bines advanced audio processing, conversion, mixing, and amplification in the smallest possible footprint while extending the battery life of feature rich portable devices. The LM49352 Features dual bi-directional I2S or PCM audio interfaces and an I2C patible interface for control. The stereo DAC path Features an SNR of 103d B with 24-bit 48 k Hz input. The headphone amplifier delivers 65m WRMS (typ) to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when HP_VDD = 2.8V. The loudspeaker amplifier delivers up to 970m W into an 8Ω load with less than 1% distortion when LS_VDD = 4.2V. The LM49352 employs advanced techniques to extend battery life, to reduce controller overhead, to speed development time, and to eliminate click and pop artifacts. Boomer audio power amplifiers are designed specifically for mobile devices and require minimal PCB area and external ponents. Notice: This document is not a full datasheet. For more information regarding this product or to order samples please contact your local National Semiconductor sales office or visit http://.national./support/dir.html - - - - PLS at LS_VDD = 4.2V, 8Ω, 1% THD 970m W (typ) PLS at LS_VDD = 3.3V, 8Ω, 1% THD 590m W (typ) SNR (Stereo DAC at 48k Hz) 103d B (typ) PSRR at 217 Hz, A_VDD = 3.3V, (HP from 90d B (typ) AUX) 4.0 Features - Ultra efficient, spread spectrum Class D loudspeaker - - - - - - - - - - - - - - - - - - - - - - - amplifier that operates at 93% efficiency Low...