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求推荐USB接口、能带手咪的Audio芯片。 手咪的交流阻抗为： 150Ω或者600Ω。
这是所有USB接口的audio 产品，包括codec，DAC等。但是带载能力应该是达不到600ohm的。
http://www.ti.com/lsds/ti/audio-ic/audio-usb-converter-product.page
