LM49352中文资料具有接地参考耳机放大器、听筒驱动器和音频 DSP 的单声道 D 类音频编解码器子系统数据手册TI规格书

描述 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 combines 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 compatible interface for control. The stereo DAC path features an SNR of 103dB with 24-bit 48 kHz input. The headphone amplifier delivers 65mWRMS (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 970mW 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 components.

特性 Features

• Ultra Efficient, Spread Spectrum Class D Loudspeaker Amplifier that Operates at 93% Efficiency
• High Performance 103dB SNR Stereo DAC
• Up to 96kHz Stereo Audio Playback
• Dual Bidirectional I2S or PCM Compatible Audio Interfaces
• Flexible Digital Mixer with Sample Rate Conversion
• Dual stereo 5 band parametric equalizers
• ALC/Limiter/Compressor on Both DAC and ADC Paths
• Stereo Auxiliary Inputs and Mono Differential Input
• Automatic Level Control for Digital Audio Inputs, Mono Differential Input, Microphone Input, and Stereo Auxiliary Inputs
• 16 Step Volume Control for Microphone with 2dB Steps
• 4 Step Volume Control for Class D Loudspeaker Amplifier
• Micro-Power Shutdown Mode
• PEP at A_VDD = 3.3V, 32Ω, 1% THD 58mW (Typ)
• PLS at LS_VDD = 5V, 8Ω, 1% THD 1.4W (Typ)
• PLS at LS_VDD = 3.3V, 8Ω, 1% THD 590 mW (Typ)
• PSRR at 217 Hz, A_VDD = 3.3V, (HP from AUX) 100dB (Typ)
Boomer is a trademark of Texas Instruments.