Zoom U-44
Compact USB audio interface with Toslink and COAX SPDIF in/outputs for using your own AD converter (recommended), plus MIDI in and out for flexible connectivity.
around $333
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It worked very well with iPad Air 2 with the Apple dongle (the big one that charges at the same time, this is crucial because LP drains your battery fast). and my current iPad Pro M1 with an Satechi USB-A HDMI SD Headphone hub, the older one with the short USB-C extension lead.