AUDIOPHONICS Digipi+AES TOSLINK TCXO Digital Interface AES/EBU for Raspberry Pi

AES / EBU and SPDIF on Raspberry Pi

This digital interface is one of the few on the SBC market to offer an AES / EBU XLR output. This greatly opens the possibilities of integration regarding solutions based on RPI. It is a good way to associate your player / mediacenter with very advanced devices favoring AES / EBU standard.

Naturally, the DigiPi + has traditional digital connectors rigor, such as a SPDIF Optical connector.

Il est également possible d'ajouter une connectique coaxiale en soudant un connecteur RCA aux pastilles indiquées dans le schéma ci-dessous.

WM8804G & Clock TCXO Interface

The interface works with a digital chip WM8804G. It is connected to a Raspberry Pi via I2S GPIO and accuracy of the digital stream is provided by a 27MHz TCXO clock Audiophonics 0.5ppm.

With this configuration, the interface is capable of handling sample rates up to 24bit / 192kHz with a distortion rate and minimal jitter (50ps).

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A power supply that suits your needs

To give you the whole attitude to make the best decision in terms of power supply, DigiPi + interface can comply with different power configuration.

We can therefore supply the interface and the Raspberry Pi via Jack 5.5x2.5mm DC input. The opposite is equally feasible and can interface will be powered by the Raspberry Pi via GPIO.

A third configuration is to use two alimenations simultaneously. Each element (DigiPi + and Raspberry Pi) is powered independently, which considerably limits the food-related interference.

specifications
Type	Digital interface
Chip	WM8804G
Input	I2S via GPIO
Output	Coaxial (to be connected) XLR AES / EBU Optical
Power Supply	5VDC via DC Jack 5.5 / 2.5mm or via GPIO
Max audio rate	192kHz 24bit
Supported software	Volumio moode
Dimensions	65 x 56 x 36 mm
Weight	44g

specifications

Type

Digital interface

Chip

WM8804G

Input

I2S via GPIO

Output

Coaxial (to be connected)
XLR AES / EBU
Optical

Power Supply

5VDC via DC Jack 5.5 / 2.5mm or via GPIO

Max audio rate

192kHz 24bit

Supported software

Volumio
moode

Dimensions

65 x 56 x 36 mm

Weight

44g

Parts supplied
DigiPi Map +	x1
spacers M2.5	x4
Phillips screw M2.5	x8

Parts supplied

DigiPi Map +

spacers M2.5

Phillips screw M2.5

Input	I2S
Output	Optical Toslink
Output	Coaxial SPDIF
Output	XLR
DAC / ADC Chip	WM8804
Max sampling rate	192kHz

Works well, but room for improvement
I have a couple of these running 24x7 in a modified HighPi Pro case which works fine.

These devices don't work well during a "brown-out" condition and sometimes don't come up properly unless you wait a good few minutes between boots.

This behaviour seems to be due to the way this board resets - it just has a 100k pull-up resistor which is not sufficient. I intend on trying a MCP100 Supervisory Controller to mitigate this but could also use a pin to a spare GPIO port to reset for when this condition happens. I would love to see a future revision of this board that has a proper reset circuit.

Extra points if a dedicated steel case with heatsinks was available.

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