產(chǎn)品概述
高端音頻設(shè)備已是當(dāng)今消費(fèi)者市場的主流，在人人必備的個人音樂播放器和高清多媒體設(shè)備等炙手可熱的消費(fèi)電子產(chǎn)品的刺激下，消費(fèi)者期望音樂座、柱形音箱以及數(shù)字有源揚(yáng)聲器等時尚家庭娛樂設(shè)備擁有高保真級音質(zhì)。盡可能地降低高效D類功率放大器產(chǎn)生的熱量，是實(shí)現(xiàn)小型散熱器和纖薄音箱設(shè)計的關(guān)鍵技術(shù)。意法半導(dǎo)體最新的Sound Terminal芯片STA350BW將D類功放的能效提升至全新的境界，讓設(shè)計人員能夠設(shè)計輸出功率高達(dá)50W且無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(shù)字音頻處理器和意法半導(dǎo)體首創(chuàng)的強(qiáng)化性能創(chuàng)新技術(shù)，如可提升音頻清晰度和系統(tǒng)可靠性的多頻帶動態(tài)范圍壓縮技術(shù)（MDRC）。這款系統(tǒng)級芯片能修正不理想的揚(yáng)聲器特性，并新增多項(xiàng)強(qiáng)化技術(shù)，如可實(shí)現(xiàn)出色低音性能的優(yōu)化低頻響應(yīng)特性。芯片集成的保護(hù)功能可有效防止各種失效狀況影響系統(tǒng)正常運(yùn)行，并可在運(yùn)行時自動診斷電路，有助于防范系統(tǒng)失效，進(jìn)而提高應(yīng)用的總體可靠性。
STA350BW的功率級采用意法半導(dǎo)體獨(dú)有的FFXTM技術(shù)，實(shí)現(xiàn)全數(shù)字音頻流不間斷傳輸至揚(yáng)聲器。新一代產(chǎn)品為客戶提供四個運(yùn)行時輸出配置選擇，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個外部超低音揚(yáng)聲器PWM輸出。
STA350BW的主要特性：
· 50W立體聲輸出，無需外部散熱器
· FFX技術(shù)將數(shù)字音頻流直接傳輸至揚(yáng)聲器
· 內(nèi)置系統(tǒng)保護(hù)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，可支持簡易的低成本系統(tǒng)設(shè)計
采用強(qiáng)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(yīng)用原理圖
