描述 Description

The LM49350 is a high performance audio subsystem that supports both analog and digital audio functions. The LM49350 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 LM49350 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 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 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.

特性 Features

? High performance 96dB SNR stereo DAC
? High performance 94dB SNR stereo ADC
? Up to 192kHz stereo audio playback
? Up to 48kHz stereo recording
? Dual bidirectional I 2S or PCM compatible audio interfaces
? Read/write I 2C compatible control interface
? Flexible digital mixer with sample rate conversion
? Dual sigma-delta PLLs for operation from any clock at any sample rate
? Digital 3D stereo enhancement
? Dual 5 band parametric equalizers
? Cascadable DSP effects that allow 10 band parametric equalization
? ALC/Compressor/Limiter on both DAC and ADC paths
? Ultra low EMI, Class D loudspeaker amplifier with spread spectrum control
? Ground referenced output cap-less headphone amplifier operation
? Earpiece speaker amplifier with reduced power consumption mode for mono differential line out applications
? Stereo auxiliary inputs or mono differential input
? Differential stereo microphone inputs with single-ended option
? Automatic level control for digital audio inputs, stereo microphone inputs, and stereo auxiliary inputs
? Flexible audio routing from input to output
? 16 Step volume control for microphones with 2dB steps
? 32 Step volume control for auxiliary inputs in 1.5dB steps
? Micro-power shutdown mode
? Available in the 3.5 x 3.5 mm 36 bump micro SMD package