产品概述

音频处理器与功率放大器二合一芯片-STA369BW。增强的功能可提高小型家庭音响设备的性能，市场定位针对使用小尺寸低价扬声器的家电设备，如平板电视和扩展站。

信号处理技术、D类功率放大器等数字音频技术，可使尺寸较小的家庭娱乐系统播放响彻房间的高音质声音，而传统的高保真技术不能产生这样的音效。音频设备厂商一直承受听音体验不断改进而设备不断变小、低格降低的市场压力。意法半导体的Sound Terminal™ 系列数字音频芯片克服了这些挑战，采用全弹性放大（FFX）等前沿技术，使音源到扬声器的音频信号为纯数字流。在实际应用中，这种设计改进了音频性能，降低了成本和设备尺寸。

STA369BW将意法半导体的音频信号处理芯片和D类功率放大器芯片的IP模块整合成一个单一芯片，包括先进的功能，如多频带动态范围压缩（DRC）技术。DRC采用最新的音频处理算法提高低价扬声器的性能，同时还防止大量的低音信号振动甚至损坏小扬声器单元。新产品另一重要特色是包含一个七波段均衡器。通过集成两个二阶无限脉冲响应滤波器，而不是普通的五波段均衡器，STA369BW改进了扬声器响应补偿和音效修整特性。在改变声道或音源时，音频流连绵不断是新产品的又一大优点。每次转换省去了输出静音和抑制噪声的操作。音频输出可以配置成8Ω扬声器的 2x20W立体声输出或2x9W+20W的2.1 声道，灵活的配置为一个硬件平台用于多种不同产品提供了可能。

以前需要多个芯片才能完成的功能，现在只需一个STA369BW，单片解决方案大大简化产品设计和组装。新芯片还与现有的平板电视用Sound Terminal芯片的引脚兼容，设计人员可以轻松地将新IC设计到下一代产品中。扩展站和中型功率家庭音响设备也将受益于新产品的高集成度、紧凑占位和优异音频性能。

STA369BW采用紧凑的PowerSSO-36封装。

产品性能

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

 

典型应用原理图