Volumio Streamplay A0 User Manual page 12

Doc Title Streamplay Module A0
The following diagram shows how to connect the S/PDIF Audio Interface to an Optical
TOSLINK Transmitter. This is an example.
2.2.3 External USB Audio Interface
With the StreamPlay, a USB-to-I2S/DSD Bridge can be used as an additional Audio
Interface (XMOS, Amanero, CT7601, etc.). The Bridge can be connected to the exposed
USB interface, directly or with a USB HUB in between.
The possibility of using an external USB Audio Interface has been implemented to provide
the freedom of choice to the StreamPlay customer.
For example, if it is required to support a higher sample frequency, or it is required to
support DSD playback.
Depending on the selected USB Audio Interface, it is possible to achieve PCM playback up
to 768 kHz / 32 bit and DSD playback up to DSD512.
If an external USB Audio Interface is connected to the system, it is possible to disable one
or both internal Audio Interfaces (I2S, S/PDIF), to avoid any interference.
Document No.:
SMA0_DS24
Figure 4: StreamPlay S/PDIF Optical reference-design
Number SMA0_DS24
Version 0.11
Page 12 of 19