High Perf Codec Sub-Sys w/ Gnd-Ref St Headph Amp Ultra Low EMI Class D Loudspkr Amp

The LM49350 is a high performance audio subsystem that supports both analog and digital audio functions. The LM49350 includes a high quality stereo DAC, a high quality stereo ADC, a stereo headphone amplifier that supports ground referenced output cap-less operation, a dual mode earpiece speaker amplifier, and a low EMI Class D loudspeaker amplifier. It is designed for demanding applications in mobile phones and other portable devices.

The LM49350 features dual bi-directional I 2S or PCM audio interfaces for full range audio and an I 2C compatible interface for control. The stereo DAC path features an SNR of 96dB with 24-bit 48 kHz input. The headphone amplifier delivers 69mWRMS (typ) to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when AVDD = 3.3V. The earpiece speaker amplifier delivers 58mWRMS (typ) to a 32Ω bridged-tied load with less than 1% distortion (THD+N) when AVDD = 3.3V. The loudspeaker amplifier delivers up to 495mW into an 8Ω load with less than 1% distortion when LSVDD = 3.3V and up to 1.2W when LSVDD = 5.0V.

The LM49350 employs advanced techniques to reduce power consumption, to reduce controller overhead, to speed development time, 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.