This digital interface is designed to fit over a Raspberry Pi type 4 / 3B+. It connects directly to the GPIO port and makes good use of the HiFiberry DAC driver. It is natively capable of operating both on Volumio or on Moode OS where it will be immediately recognized with HifiBerry driver.

I2S output

The module has an I2S output on an HDMI LVDS connector. This I2S output can be configured as native DSD to drive a DAC with native DSD support (such as an AKM DAC type AK4493). It can also be configured to broadcast the DSD frame via PCM (DoP) for use with ESS technologies (ES9038Q2M & ES9038Pro). 

Switching from one mode to the other (DSD Native / DoP) is done simply by means of a jumper. When the jumper is in place, the system enters DoP mode. The IIS output can reach a sampling rate of up to 32bit 384kHz (PCM) and DSD128 (DSD & DoP). Two diodes are used to report good reception of DSD streams (DSD LOCK).

SPDIF

The PCB provides a coaxial S/PDIF RCA port as well as an optical Toslink output. This connection supports sample rates up to 24bit 192kHz and DoP64. The output connectors and the DC jack connector dedicated to the device power are positioned to fall on the same side as the Raspberry PI connectors, allowing a clean assembly and installation without loose cables.