It can, it just needs the two resistors, which is the cheapest possible thing the standards committee could have asked manufacturers to do.

USB-C gets complicated at the high end, but for basic functionality I think the standards committee did a very good job at making the cheapest way to do it the correct way, e.g. a USB-C to 3.5mm audio adaptor can be entirely passive, it just needs the right resistor in it.

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RobotToaster 5 days ago | parent | next [-]

Then a lot of phones don't support it, so it took me three attempts to find a usb-c to 3.5mm adapter that didn't have it's own DAC that would work with my phone's FM radio lol

	▲	kevin_thibedeau 4 days ago \| parent \| next [-]
		Audio Adapter Accessory Mode was deprecated last year so devices using it will be disappearing.
	▲	silisili 4 days ago \| parent \| prev [-]
		Do you mind sharing? I was looking for something like this a couple years ago.

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DoctorOetker 5 days ago | parent | prev [-]

>e.g. a USB-C to 3.5mm audio adaptor can be entirely passive, it just needs the right resistor in it.

How does that work? is each USB-C host port, or downstream USB-C hub port required to contain a stereo DAC? Does the standard impose performance requirements like dynamic range, noise, minimum sample rate,...? Does it also mandate the jack can be used for mic / line-in? Does it similarily stipulate inclusion of an ADC in each port?

	▲	jadamson 5 days ago \| parent [-]
		It doesn't mandate any of that, it's an optional feature. The data pins are repurposed for analog audio, so it won't work with hubs. You'd of course need a DAC for output and an ADC for mic input, but the point is to replace a headset jack, so you'd have those already. https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%... (PDF, page 309)