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确保通过USB-C输出模拟音频

由  Julie Tyler 发布  - 09-28-2018 

今天,使用智能设备的数字音频串流是最受欢迎的消费形式之一,因为它让我们随时随地甚至在公共汽车或火车上都能听到我们最喜欢的音乐。借助于一对耳机,我们可从任何拥挤的公共空间逃离到私密空间。

随着我们已依赖我们的音频内容,以从每日工作中放松,制造商开始逐步淘汰简陋的3.5mm插孔,这是耳机的主要接口。可以理解,因为插孔的外形已成为进一步减小智能手机厚度的限制因素。

不完全放弃有线连接,而支持蓝牙连接的耳机和扬声器,目的是使用单一的、更小的端口来满足我们所有的电力和数据需求。USB-CTM(Type-CTM)连接器应运而生.

这不一定意味着我们需要用有一个USB-CTM连接器的新装置更换我们最喜欢的耳机,至少不是在一夜之间。适配器将提供一个接口在旧的3.5mm插头和新的Type-CTM连接器之间,但这并不保证每个Type-CTM接口将支持模拟音频。外部适配器将提供新旧连接器之间的兼容性,而FSA4480 USB-CTM模拟音频开关将提供所需的内部接口,以确保Type-CTM连接器能够输出模拟音频。

FSA4480的众多优点之一是它能自动检测插入的3.5mm插头的类型。仔细看您的耳机引线的末端,您可能会注意到插头周围有两个或三个绝缘带,把插头分成三到四个电隔离部分。带有四个部分的耳机通常表示耳机含一个麦克风。含一个麦克风的耳机符合两个标准之一,OMTP或AHJ。有什么不同吗?接地和麦克风连接都是镜像的。FSA 4480能够检测和切换接地和麦克风信号到3.5mm插头上的正确频带。事实上,该器件集成了模拟开关来处理Type-CTM连接器的一系列数据信号,包括USB数据、边带信号、麦克风信号、接地检测和高保真音频。

图1. 应用框图

FSA4480通过I2C接口使用寄存器控制和访问,可检测引脚之间的过电压和短路并作出响应。例如,如果端口接触到水或其他形式的污染物,它可以保护主机。此外,可以自定义启用和禁用计时。这支持顺畅的音频转换,消除爆破声和喀哒声。

古老的3.5mm插孔可能正在被我们的生活淘汰,但任何时候音频都不会被丢弃。确保我们的设备能够支持音频接口,因为我们向Type-C模式过渡对制造商和消费者都很重要。FSA4480确保我们可在需要时继续将世界屏蔽,无论我们选择何种头盔。

请访问我们的USB-C方案页面,并了解关于我们方案的更多信息!

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