iPad Mini 2 headphone jack

Absolutely, catagorically, the 3.5mm TRRS headphone jack on all iPad devices have only electrical contacts.

Unlike some Apple devices that will accept a 3.5mm optical TOSLINK adapter, iPad and iPhone do not support this feature.

A possble and effective solution/workaround, for your need, might be to use an Apple Airport Express - if you can find one - and use it as an AirPlay client.

The Apple Airport Express is not just a very capable WiFi router, but also has the coveted 3.5mm TOSLINK port that you seek. This would allow you to effectively output a multi-channel audio stream from any iOS device that supports AirPlay, to your DAC. The Express can not only be used as a [WiFi] router, or network extender, but can also be configured simply as an Ethernet and/or AirPlay client.

Unfortunately, unless you already possess one, you’re unlikely to find a brand new device as Apple discontinued them sometime last year - but they can still be found on some of the popular auction sites. If going down this route, look for Apple Airport Express 802.11n (Second Generation).

These superb little boxes are incredibly flexible with a unique feature set. Note - the later Airport Extreme (also now discontinued by Apple) does not include the 3.5mm jack - or AirPlay. Only the Express has these features.

Hope you find this helpful.

I'm pretty positive the answer is no, it's a standard 3.5mm headphone jack.

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This has nothing to do with the OP's question. Instead of posting to an unrelated thread, post your question in a new thread.

i pad mini 2 i lock icloud.you can help me unlock it

This has nothing to do with the subject of this thread. Start your own thread with your issue, providing as much detail as possible and someone will help you.