产品概述

高端音频设备已是当今消费者市场的主流，在人人必备的个人音乐播放器和高清多媒体设备等炙手可热的消费电子产品的刺激下，消费者期望音乐座、柱形音箱以及数字有源扬声器等时尚家庭娱乐设备拥有高保真级音质。尽可能地降低高效D类功率放大器产生的热量，是实现小型散热器和纤薄音箱设计的关键技术。意法半导体最新的Sound Terminal芯片STA350BW将D类功放的能效提升至全新的境界，让设计人员能够设计输出功率高达50W且无需散热器的纤薄型音频产品。 

如其它Sound Terminal系列产品一样，STA350BW集成了数字音频处理器和意法半导体首创的强化性能创新技术，如可提升音频清晰度和系统可靠性的多频带动态范围压缩技术（MDRC）。这款系统级芯片能修正不理想的扬声器特性，并新增多项强化技术，如可实现出色低音性能的优化低频响应特性。芯片集成的保护功能可有效防止各种失效状况影响系统正常运行，并可在运行时自动诊断电路，有助于防范系统失效，进而提高应用的总体可靠性。

STA350BW的功率级采用意法半导体独有的FFX^TM技术，实现全数字音频流不间断传输至扬声器。新一代产品为客户提供四个运行时输出配置选择，可支持多种功率放大输出模式，包括2.0、2.1或1.0声道、或2.0声道加1个外部超低音扬声器PWM输出。 

STA350BW的主要特性： 

· 50W立体声输出，无需外部散热器 

· FFX技术将数字音频流直接传输至扬声器 

· 内置系统保护和性能优化功能 

· 与Sound Terminal系列芯片的引脚和软件相互兼容 

· 下嵌散热片PowerSSO 36引脚封装，可支持简易的低成本系统设计 

采用强化散热性能的Power SSO36封装

性能特点

 Wide-range supply voltage
– 5 V to 26 V (operating range)
– 30 V (absolute maximum rating)
 Four power output configurations
– 2 channels of ternary PWM (stereo mode)
(2 x 50 W into 6  at 25 V)
– 3 channels - left, right using binary and LFE
using ternary PWM (2.1 mode) (2 x 18 W +
1 x 40W into 2 x 4 , 1 x 8  at 25 V)
– 2 channels of ternary PWM (2 x 50 W) +
stereo lineout ternary
– 1 channel of ternary PWM as mono-BTL
(1 x 90 W into 3  at 24.5 V)
 FFX™ 100 dB SNR and dynamic range
 Selectable 32 to 192 kHz input sample rates
 I2C control with selectable device address
 Digital gain/attenuation +42 dB to -80 dB with
0.125 dB/step resolution
 Soft-volume update with programmable ratio
 Individual channel and master gain/attenuation
 Two independent DRCs configurable as a
dual-band anti-clipper (B2DRC) or independent
limiters/compressors
 EQ-DRC for DRC based on filtered signals
 Dedicated LFE processing for bass boosting
with 0.125 dB/step resolution
 Audio presets:
– 15 preset crossover filters
– 5 preset anti-clipping modes
– Preset nighttime listening mode
 Individual channel and master soft/hard mute
 Independent channel volume and DSP bypass
 Automatic zero-detect mute
 Automatic invalid input-detect mute
 I2S input data interface
 Input and output channel mapping
 Up to 8 user-programmable biquads per
channel
 3 coefficient banks for EQ presets storing with
fast recall via I2C interface
 Extended coefficient dynamic up to -4..4 for
easy implementation of high shelf filters
 Bass/treble tones and de-emphasis control
 Selectable high-pass filter for DC blocking
 Advanced AM interference frequency
switching and noise suppression modes
 Selectable high or low bandwidth
noise-shaping topologies
 Selectable clock input ratio
 96 kHz internal processing sample rate with
quantization error noise shaping for very low
cutoff frequency filters
 Thermal overload and short-circuit protection
embedded
 Video apps: 576 x Fs input mode supported
 Fully compatible with STA339BW and STA339BWS

管教排列

典型应用原理图