產(chǎn)品概述

高端音頻設備已是當今消費者市場(chǎng)的主流，在人人必備的個(gè)人音樂(lè )播放器和高清多媒體設備等炙手可熱的消費電子產(chǎn)品的刺激下，消費者期望音樂(lè )座、柱形音箱以及數字有源揚聲器等時(shí)尚家庭娛樂(lè )設備擁有高保真級音質(zhì)。盡可能地降低高效D類(lèi)功率放大器產(chǎn)生的熱量，是實(shí)現小型散熱器和纖薄音箱設計的關(guān)鍵技術(shù)。意法半導體最新的Sound Terminal芯片STA350BW將D類(lèi)功放的能效提升至全新的境界，讓設計人員能夠設計輸出功率高達50W且無(wú)需散熱器的纖薄型音頻產(chǎn)品。 

如其它Sound Terminal系列產(chǎn)品一樣，STA350BW集成了數字音頻處理器和意法半導體首創(chuàng )的強化性能創(chuàng )新技術(shù)，如可提升音頻清晰度和系統可靠性的多頻帶動(dòng)態(tài)范圍壓縮技術(shù)（MDRC）。這款系統級芯片能修正不理想的揚聲器特性，并新增多項強化技術(shù)，如可實(shí)現出色低音性能的優(yōu)化低頻響應特性。芯片集成的保護功能可有效防止各種失效狀況影響系統正常運行，并可在運行時(shí)自動(dòng)診斷電路，有助于防范系統失效，進(jìn)而提高應用的總體可靠性。

STA350BW的功率級采用意法半導體獨有的FFX^TM技術(shù)，實(shí)現全數字音頻流不間斷傳輸至揚聲器。新一代產(chǎn)品為客戶(hù)提供四個(gè)運行時(shí)輸出配置選擇，可支持多種功率放大輸出模式，包括2.0、2.1或1.0聲道、或2.0聲道加1個(gè)外部超低音揚聲器PWM輸出。 

STA350BW的主要特性： 

· 50W立體聲輸出，無(wú)需外部散熱器 

· FFX技術(shù)將數字音頻流直接傳輸至揚聲器 

· 內置系統保護和性能優(yōu)化功能 

· 與Sound Terminal系列芯片的引腳和軟件相互兼容 

· 下嵌散熱片PowerSSO 36引腳封裝，可支持簡(jiǎn)易的低成本系統設計 

采用強化散熱性能的Power SSO36封裝

性能特點(diǎn)

 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

典型應用原理圖