AK4118 digital interface for SPDIF Raspberry Pi 4 / Pi 3

AK4118 Interface digitale SPDIF Raspberry Pi 4 / Pi 3 New

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Reference : 14255
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Shipping date: 20-01-2020.

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AK4118 digital interface for Raspberry Pi

PCM 384kHz / DSD128, I2S / Coax / Optical



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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 embeds an I2S output on 2.54mm connectors. This I2S output can be configured in native DSD for driving a DAC with native DSD capacity (such as DAC type AKM AK4493). It can also be configured to send the DSD frame via PCM (DOP) for use with ESS systems (ES9038Q2M & ES9038Pro).

The transition from one mode to another (DSD Native / DOP) is simply done using a jumper. When in place, the system enters DOP mode.

IIS output can reach a sampling frequency up to 384kHz - 32bit (PCM) and DSD128 (DSD & DOP).

Two diodes allow to account for DSD streams (DSD LOCK).

SPDIF

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The PCB provides a coaxial S / PDIF RCA port as well as an optical TOSLINK output. This connection supports sample rates up to 192kHz - 24bit 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.

quality audio components


A reference chip AK4118 AKM is in charge of the conversion of the audio stream to an S / PDIF signal. The coaxial output is drivée by a DS8921 chip.

Power supply stage benefits from a ADP151 LDO which provides excellent signal stability and minimize electronic noise.

An isolation transformer Pulse PE-65612NL separates cleanly audio circuit from logic circuits and power supply.

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Power supply


The module offers several possibilities regarding its power-supply. It can be powered directly by the Raspberry Pi via the GPIO connection. Conversely, it may be used as a power supply  for both the Raspberry Pi and itself through a DC jack 5.5 / 2.5mm connector.

Please note that neither the Raspberry Pi, or the module are designed to withstand a double power-supply. It is therefore appropriate to feed both via the DC input jack OR via the micro-USB / USB-C PI rasbperry. Both power supplies must never be used simultaneously.

The power supply circuit operates with a voltage of 5 VDC (5% tolerance). It requires at least 2A current.

Specifications
Typedigital interface
inputsGPIO
OutputsCoaxial S / PDIF (CAR)
Optical (Toslink)
I2S
Raspberry Pi compatible modelsRPI 3B +
RPI 4
supported sampling frequenciesPCM: 44.1-384kHz (moode)
PCM: 44.1-192kHz (Volumio)

DSD DSD64 - DSD 128 (moode)
DSD: DSD64 (Volumio)
Power supplyJack 5V DC Connector 5.5 / 2.5mm
OR
GPIO (powered by the Rasperry Pi)
Dimensions (card only)85 x 55
Dimensions (mounted RPI)85 x 55 x 41 mm
Recommanded spacersM2.5 x 20mm
 
Data sheet
InputGPIO
OutputOptical Toslink
OutputCoaxial SPDIF
 
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