產品概述

音頻處理器與功率放大器二合一芯片-STA369BW。增強的功能可提高小型家庭音響設備的性能，市場定位針對使用小尺寸低價揚聲器的家電設備，如平板電視和擴展站。

信號處理技術、D類功率放大器等數字音頻技術，可使尺寸較小的家庭娛樂系統播放響徹房間的高音質聲音，而傳統的高保真技術不能產生這樣的音效。音頻設備廠商一直承受聽音體驗不斷改進而設備不斷變小、低格降低的市場壓力。意法半導體的Sound Terminal™ 系列數字音頻芯片克服了這些挑戰，采用全彈性放大（FFX）等前沿技術，使音源到揚聲器的音頻信號為純數字流。在實際應用中，這種設計改進了音頻性能，降低了成本和設備尺寸。

STA369BW將意法半導體的音頻信號處理芯片和D類功率放大器芯片的IP模塊整合成一個單一芯片，包括先進的功能，如多頻帶動態范圍壓縮（DRC）技術。DRC采用最新的音頻處理算法提高低價揚聲器的性能，同時還防止大量的低音信號振動甚至損壞小揚聲器單元。新產品另一重要特色是包含一個七波段均衡器。通過集成兩個二階無限脈沖響應濾波器，而不是普通的五波段均衡器，STA369BW改進了揚聲器響應補償和音效修整特性。在改變聲道或音源時，音頻流連綿不斷是新產品的又一大優點。每次轉換省去了輸出靜音和抑制噪聲的操作。音頻輸出可以配置成8Ω揚聲器的 2x20W立體聲輸出或2x9W+20W的2.1 聲道，靈活的配置為一個硬件平臺用于多種不同產品提供了可能。

以前需要多個芯片才能完成的功能，現在只需一個STA369BW，單片解決方案大大簡化產品設計和組裝。新芯片還與現有的平板電視用Sound Terminal芯片的引腳兼容，設計人員可以輕松地將新IC設計到下一代產品中。擴展站和中型功率家庭音響設備也將受益于新產品的高集成度、緊湊占位和優異音頻性能。

STA369BW采用緊湊的PowerSSO-36封裝。

產品性能

Wide-range supply voltage, 4.5 V to 21.5 V
Three power output configurations:
– 2 channels of ternary PWM
(2 x 20 W into 8 Ω at 18 V) + PWM output
– 2 channels of ternary PWM
(2 x 20 W into 8 Ω at 18 V) + ternary stereo
line-out
– 2.1 channels of binary PWM (left, right,
LFE) (2 x 9 W into 4 Ω +1 x 20 W into 8 Ω
at 18 V)
FFX with 100-dB SNR and dynamic range
Scalable FFX modulation index (up to 100%)
Selectable 32- to 192-kHz input sample rates
I2C control with selectable device address
Digital gain/attenuation +48 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 as
independent limiters/compressors with
optional global DRC capability
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 night-time listening mode
Individual channel soft/hard mute
Independent channel volume and DSP bypass
I2S input data interface
Input and output channel mapping
Automatic invalid input-detect mute
Up to 8 user-programmable biquads/channel
Three coefficients banks for EQ presets storing
with fast recall via I2C interface
Extended filter dynamics +4/-4 for better sound
shaping and easier filter implementation
Bass/treble tones and de-emphasis control
Selectable high-pass filter for DC blocking
Advanced AM interference frequency
switching and noise suppression modes
F3X™ advanced PWM modulation scheme for
carrier suppression (headphone or line output)
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
cut-off frequency filters
Thermal overload and short-circuit protection
embedded
Video apps: 576 x fS input mode supported
PCB manufacturing short-circuit protection
technology

管教排列

典型應用原理圖