The HiFiBerry Digi+ is a high-quality S/PDIF output for the Raspberry Pi. It uses the I2S sound port that connects directly to the CPU without the need for an additional USB conversion. It supports sample rates up to 192kHz/24bit.
The standard version features an optical output (TOSLink) and an electrical output.
Dedicated S/PDIF interface chip supports up to 192kHz/24bit resolution
Optical (Toslink) and electrical outputs
Bit-perfect output—audio data stream will not be modified in any way
Connects directly to the Raspberry Pi—no additional cables needed
Directly powered from the Raspberry Pi—no additional power supply
Optional: high-bandwidth output transformer provides full galvanic isolation of the electrical output (not in the standard version)
Integrated EEPROM for automatic configuration
Comes with all components required to mount it (we include fitting spacers to fix the board onto the Raspberry Pi)
Important note: While the hardware is able to output DTS/Dolby Digital, software has to be adapted to support this. We will support the developers to implement this. Unfortunately we can’t guarantee that this feature will work with a specific software. Please ask the developers of the software if this is supported.
All Digi+ boards can be mounted without soldering. They match the Raspberry Pi A+/B+/2/3
The output transformer provides a full galvanic isolation between the Raspberry Pi and your DAC on the electrical output. Usual consumer-grade SPDIF outputs do not use output transformers. Usually this works without problems. However, many audio enthusiasts like to use this option. If you’re not sure, the standard version is most likely sufficient for you. Note that the output transformer is shielded. To make sure the shielding works, your DAC needs to be grounded. If you’re unsure, we recommend the standard version. The output transformer does not have any effect on the optical output. Therefore if you plan to use only the optical output, the standard version will do the job.