ADI SSM2380 2x2W D类立体声音频放大方案

ADI公司的SSM2380是带ALC+I2C的无滤波器2x2W D类立体声音频放大器,单电源2.5V到5.5V工作,在5.0V电源时能向4欧姆负载提供2W连续输出功率,而THD+N小于1%,效率为93%,信噪比大于100dB.SSM2380主要应用在手机,MP3播放器,手提电子设备.本文介绍SSM2380主要特性, 功能方框图, I2C 模式, ALC 模式和增益模式的典型应用电路图及其配置图.

SSM2380: 2x2W Filterless Class-D Stereo Audio Amplifier with ALC + I2C

The SSM2380 is a fully integrated, high efficiency, stereo Class-D audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5 V to 5.5 V supply. It is capable of delivering 2 W of continuous output power with <1% THD + N driving a 4 Ω load from a 5.0 V supply.

The SSM2380 features a highly flexible I2C interface with many useful settings. Using the I2C control interface, the gain of SSM2380 can be selected from 1dB to 24 dB + Mute in 47 steps with no external components. Other features accessed from the I2C interface are: Independent L/R channel shutdown, Variable ultra-low EMI emission control mode, Automatic Level Control (ALC) for high quality speaker protection, and Stereo-to-Mono mixing operation.
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