Datasheet Digi2 Pro


Datasheet Digi2 Pro


The HiFiBerry Digi2 Pro is a high-resolution SPDIF interface for the Raspberry Pi (newer models with 40 pin GPIO connector). This is a special sound card for the Raspberry Pi, optimised for one specific use case: affordable high-quality audio playback.


  • SPDIF output 2-channel
  • can be equipped with an additional Digital Signal Processor (DSP) for flexible audio processing
  • No volume or sound controls, just passes digital audio as it is sent from the application (“bit-perfect”)
  • Output isolation transformer
  • Connects directly to the Raspberry Pi, no additional cables needed
  • No soldering, comes as a pre-fabricated kit. You just plug it onto the Raspberry Pi, it is conform to the Raspberry Pi hardware-attached-on-top (HAT) specification.
  • Compatible with all Raspberry Pi models with a 40-pin GPIO connector
  • Directly powered from the Raspberry Pi, no additional power supply
  • Low-noise linear voltage regulator
  • Low-jitter dual-domain clock for optimised clock decoupling from the Raspberry Pi
  • HAT compliant, EEPROM for automatic configuration
  • Comes with all components required to mount it. We include 4 M2.5x12mm spacers to fix the board onto the Raspberry Pi


1Dual-domain clock circuit
2Output isolation transformer

Connectors and Jumpers

1DSP connector
25V power supply connector
3TOSLink output
4RCA output
5isolation ground jumper
6optional BNC connector


Output impedance75Ohm

Channel count2support for non-audio data (e.g. Dolby Digital, DTS)
Power consumption<0.3W
Sample rates44.1-192kHzsee below for TOSLink

Not all DACs might support sample rates (96kHz, 192kHz) via TOSLink. Check the documentation of your DAC!


Overlay for config.txt:


Addional documentation

Last updated: October 17, 2022