音频处理器与功率放大器二合一芯片-STA339BW。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。
作Sound Terminal产品家族的成员,STA339BW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,STA339BWS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STA339BW,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。
STA339BW采用紧凑的PowerSSO-36封装。
产品性能
Wide voltage supply range
– 5 V to 26 V (operating range)
– 30 V (absolute maximum rating)
3 power output configurations
– 2 channels of ternary PWM (stereo mode)
(2 x 20 W into 8 Ω at 18 V)
– 3 channels - left, right using binary and LFE
using ternary PWM (2.1 mode) (2 x 9 W +
1 x 20W into 2 x 4 Ω, 1 x 8 Ω at 18 V)
– 2 channels of ternary PWM (2 x 20 W) +
stereo lineout ternary
2.1 channels of 24-bit FFX® 100 dB SNR and
dynamic range
Selectable 32 to 192 kHz input sample rates
I2C control with selectable device address
Digital gain/attenuation +48 dB to -80 dB with
0.5 dB/step resolution
Soft volume update with programmable ratio
Inpidual channel and master gain/attenuation
Two independent DRC configurable as a
dual-band anti-clipper (B2DRC) or as
independent limiters/compressors
EQ-DRC for DRC based on filtered signals
Dedicated LFE processing for bass boosting
with 0.5 dB/step resolution
Audio presets:
– 15 preset crossover filters
– 5 preset anti-clipping modes
– Preset night-time listening mode
Inpidual channel and master soft/hard mute
Independent channel volume and DSP bypass
Automatic zero-detect mute
Automatic invalid input-detect mute
2-channel I2S input data interface
Input and output channel mapping
Up to 8 user-programmable biquads per
channel with 28-bit resolution
3 coefficient banks for EQ presets storing with
fast recall via I2C interface
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
Variable max power correction for lower
full-power THD
Selectable clock input ratio
96 kHz internal processing sample rate, 24 to
28-bit precision
Thermal overload and short-circuit protection
embedded
Video apps: 576 * fS input mode supported
Fully compatible with STA339BWS.
管教排列
典型应用原理图