The LM49350RL/NOPB is a high performance audio subsystem that supports both analog and digital audio functions. The LM49350RL/NOPB includesa high quality stereo DAC, a high quality stereo ADC, a stereo headphone amplifier that supports ground referenced outputcap-less operation, a dual mode earpiece speaker amplifier, and a low EMI Class D loudspeaker amplifier. It is designed fordemanding applications in mobile phones and other portable devices.
The LM49350RL/NOPB features dual bi-directional I2S or PCM audio interfaces for full range audio and an I2C compatible interface for control. The stereo DAC path features an SNR of 96dB with 24-bit 48 kHz input. The headphone amplifierdelivers 69mWRMS (typ) to a 32? single-ended stereo load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The earpiece speaker amplifier delivers 58mWRMS (typ) to a 32? bridged-tied load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The loudspeaker amplifier delivers up to 495mW into an 8? load with less than 1% distortion when LS_VDD = 3.3V and up to 1.2W when LS_VDD = 5.0V.
The LM49350RL/NOPB 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 powerwith a minimal amount of external components. It is therefore ideally suited for mobile phone and other low voltage applicationswhere minimal power consumption, PCB area and cost are primary requirements.
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