colonelkernel8
Headphoneus Supremus
Agreed. Without controls it would be much smaller though, however still looks to big to fit in with the authentication chip in a normal lightning connector.
What would be nice is a case no thicker than the Apple silicone cases that have a nice competent dac and amp baked in, plus 3.5mm port. Many (most?) use a case anyway.
It's likely that in a non-reference design, they use a CSP (chip scale package) that isn't coated in plastic like these are. The package accounts for a majority of the space in this reference design.
Edit: Just looked it up, it does come in a CSP: https://www.cirrus.com/en/products/pro/detail/P1411.html