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USB-C音频:全新的通用聆听体验

由  Julie Stultz 发布  - 2019-10-28 

很少有一天不会碰到没戴音频耳塞或耳机的人。音频已不再与家庭立体声系统、汽车收音机和Walkman®隔离。音频现已成为大多个人电子设备的主打。尽管正趋向无线蓝牙耳机而发展,但有人争辩说有线耳机的音频质量仍较高。此外,使用无源有线耳机无需担心电池电量会耗尽。随着USB-C(称为Type-C)的推出以及单一通用连接器的趋势,有线音频也必须适应新趋势。安森美半导体提供的产品可帮助系统设计人员将音频集成到USB-C中,同时保持真正的高保真度。

许多人担心如没有3.5mm插孔会影响通过连接器的音频质量。大多数将USB传统连接器和USB-C与严格的数字数据相关联。人们普遍认为,USB-C上的音频必须是数字的。为了使USB-C具有通用性和包容性,USB-C规范允许使用模拟音频及数字音频。 USB-C规范中有一个条款说明,如果使用模拟音频,则系统中也必须支持数字音频。USB-C电缆具有专用的D+/D-引脚,除支持数字数据,还支持模拟音频R和L信号。SBU引脚可用于麦克风和接地信号。虽然一些耳机制造商正在开发具有USB-C连接器的耳机,但许多公司仍在开发转换加密狗。加密狗是一种小型适配器,一端带有3.5mm端口,另一端带有USB-C,使消费者继续使用自己喜欢的3.5mm耳机。加密狗的主要问题是增加的复杂性。现在,音频发烧友都任由摆布,受制于任何DAC与另一个模拟放大器集成到加密狗中。全世界发烧友一直力求尽量减少伤害信号的机会。消费者无从知道加密狗中的附加电路可能有多好。信号链中的每个阶段都会增加失真和矫作,从而降低您想要享受的信号质量。虽然加密狗的存在可能会影响音质,但许多消费者选用这种便宜的选项,而不是立即更换自己钟爱的耳机。

随着USB-C上模拟音频的出现,设计人员面对保持音质的挑战。更高的音质靠引入最少数量的干扰和失真,且通常通过测量元件的总谐波失真加噪声(THD+N)来量化。此参数通常在音频产品的数据表中找到。THD+N值越低,设备保留的音频将越多,声音质量也越好。安森美半导体的音频开关具有业界领先的THD+N性能。

安森美半导体的集成方案能简化USB-C模拟音频的集成,同时保持信号完整性和音频高质量。安森美半导体提供的方案包括用于USB-C CC隔离的开关,用于音频的多路复用器和传统USB信令。还有用于信号接地、麦克风和SBU交叉点的感应开关。每个开关都经过专门优化,以实现其各自协议的最佳信号完整性。设计人员可能会争辩说,可以使用分立元件来实现这些电路。但是由于传统通用元件的宽容度,无法实现相同水平的性能和设备匹配。对于大多数先进设计,采用分立方案会占更多的PCB面积和功耗更大。

 

USB-C 音频应用图

 

FSA4476模拟音频开关含保护功能应用于USB-C,是专门针对该应用领域设计的首款产品。

-110dB的THD+N可以保留高保真音频。 USB 2.0信号可以通过1 GHz带宽开关以很小的衰减传递,从而有信心通过高速眼图。为了延长超便携式系统的电池寿命,FSA4476的最小功耗仅为:动用时仅为25µA,关闭时为5µA。 FSA4480是FSA4476的后继产品。FSA4480包括其他功能,例如OMTP/CTIA检测以及降低爆音与嘀哒声。它还包括专用的接地检测开关,使终端系统有更好的串扰性能。

 

FSA4480框图

安森美半导体的USB-C模拟音频开关已集成在最先进的封装技术中,可实现最小的PCB尺寸。 功耗比类似分立设计低一个数量级。这些器件将使您的设计更小,更高能效,最重要的是,音频性能确是同类产品中最好的,且远远超过其他任何方案。

了解有关采用FSA4476FSA4480的USB-C模拟音频产品的更多信息。

标签:Automotive, Consumer, Computing and Peripherals, IoT, Portable and Wireless, Power Supply
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