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RASPTOUCH DIGITAL AK4118 Touch Streamer SPDIF I2S HDMI LVDS Pi 4 384kHz DOP128
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RaspTouch Digital AK4118
Streamer with digital output SPDIF & I2S / 384kHz DOP128
Concept
This version of the RaspTouch is a simple and efficient hardware solution integrating a network streamer with digital output SPDIF optical / SPDIF coaxial & I2S on HDMI port (see I2S compatibility details below). The device offers formidable audio precision thanks to an AK4118 digital audio interface by AKM, which is natively supported by HiFiberry drivers / RPI-DAC and offers audio capacities up to 384kHz / 32bit & DOP128 (variable depending on the chosen software distribution).
The device offers a pleasant and easy-to-use interface with its Raspberry Pi 4 base + touch screen, capable of operating your favorite linux audio distributions (Volumio, moOde Audio ... etc.)
Digital Interface AK4118
The Rasptouch Digital AK4118 has a digital interface card based on a AKM AK4118 chip. It converts the audio streams from the Raspberry Pi to an S/PDIF & I2S signal. The coaxial output is driven by a DS8921 chip and the I2S output is configured by default to broadcast the DSD frame via PCM (DOP) for use with ESS technologies (ES9038Q2M & ES9038Pro). An internal circuit automates the detection of non-PCM streams in order to avoid bothering the user when reading DSD files.
The digital stage uses its own power supply with an ADP151 LDO regulator ensuring excellent signal stability while minimizing electronic noise. In addition, a Pulse PE-65612NL isolation transformer can cleanly separate the audio circuit from the logic circuits and the power supply.
Power Management
The RaspTouch has its own power manager. This allows it to cleanly start and shut the Raspberry Pi (like an ATX computer) from a single button located on the side of the device. This function is ideal to prevent SD card corruption.
The button also has a light indicator whose behavior provides information on the status of the device. :
- LED OFF : Raspberry Pi Off
- Slow Blink : Raspberry Pi powered on, starting the software solution, waiting for the BOOT OK signal. Reverse operation for extinction
- Fast Blink : Reboot order sent from the software solution used (soft reboot)
- LED continuously ON : Raspberry Pi powered on, software solution correctly started and ready to use
Connectivity
The RaspTouch offers a wide connectivity that allow you to take full advantage of your audio system. Most of the connection of the Raspberry Pi 4 with its 2 USB-A 2.0 ports & 2 USB-A 3.0 ports, its Micro SD port and its Ethernet port. The USB ports enables the device tio work with all kinds of compatible peripherals:
- Hard Drives of USB storage
- USB WiFi Dongle
- External USB DAC
- Keyboard / ouse ...
The AK4118 digital interface has two digital SPDIF outputs (coaxial on RCA port and optical on Toslink port) as well as an I2S output on HDMI port (LVDS).
The power is supplied by a DC 5.5 / 2.1mm base connected to an integrated linear power supply allowing good stability. The optimum input voltage is 7 to 9V DC and can go up to 12V maximum.
The ON/OFFbutton not only turns off the power, but starts shutting down the system beforehand. The configuration of this function is available as a native plugin under Volumio.
Please note, despite the native WiFi connectivity of the Raspberry Pi 4, the latter has been sacrificed to install the reader in an aluminum box isolated from disturbances. The wifi connection therefore requires an external USB adapter (Wifi Dongle).
Software
Announcing himself as a free system, the RaspTouch comes without operating system. This choice depends on your other devices, the ambition of the project and the expected functionality.
The device is ready as far as electronics are concerned, So it remains to choose an operating system and mount it on a micro-SD card. Many softwares are available to meet all your expectations: piCorePlayer, Max2Play, OpenELEC, Volumio ...
Depending on the software, you can access the following features:
- Complete Support and unlimited Multiroom
- Remote Play audio files stored on a media server connected to the network (NAS)
- Remote reading from a UPnP source.
- Playback from USB source (hard disk, USB key)
- DLNA Management
- Support Qobuz
- Support Airplay
Please note: depending on the chosen distribution, the maximum sampling rate may be restricted by the software.
Likewise, the software configuration to take advantage of all the hardware capabilities of the RaspTouch can vary significantly in difficulty.
- If you are looking for the easiest setup, Volumio comes highly recommended.
- If you are looking to achieve maximum sampling rate, moOde Audio is recommended.
I2S via HDMI LVDS
The I2S LVDS pinout is shown in the diagram here.
This socket, although it uses the HDMI format, has nothing in common with the one found on video devices.
It is used to transfer a balanced I2S signal (LVDS). As this format has no particular standard, we cannot guarantee 100% compatibility with your device.
However, we have successfully tested it with several latest generation DACs by Topping, SMSL, Matrix and Gustard brands.
| Specifications | |||
|---|---|---|---|
| Type | Streamer with digital outputs | ||
| Input | USB-A 2.0 x 2 USB-A 3.0 x 2 RJ45 x1 Slot Micro-SD x 1 | ||
| Output | Coaxial SPDIF x 1 Optical SPDIF x 1 I2S via HDMI (LVDS) x 1 | ||
| Power Supply | Jack DC 5.5/2.1mm - 7.5V 2.9A (included) | ||
| Max Sampling Rate | I2S : PCM 384kHz DOP128 SPDIF : PCM 192kHz DOP64 | ||
| I2S via HDMI | LVDS (non-compatible with Audio-GD) | ||
| Raspberry Pi 4 | |
|---|---|
| SoC | Broadcom BCM2711 |
| CPU | ARM Quad Core Cortex-A72 (ARM v8) 64bit SoC @ 1.5GHz |
| Wifi | NEEDS WIFI DONGLE |
| Bluetooth | 5.0 |
| RAM | 2Gb LPDDR4 |
| Display & Case | |
|---|---|
| Primary display | 7" capacitive tactile screen 800 x 400px |
| Case material | Aluminium |
| Material back panel | Acrylic |
| Color | Black |
| Dimensions | 200 x 95 x 230mm |
| Weight | 1400g |
| Package Contents | |
|---|---|
| RaspTouch Digital AK4118 | x1 |
| Power Supply Meanwell 7.5V | x1 |
| Polyurethane feet 3M | x4 |
| Input | RJ45 |
| Input | USB |
| Output | I2S LVDS via HDMI |
| Output | Optical Toslink |
| Output | Coaxial SPDIF |
| Max sampling rate | 384kHz |
| Color | Black |
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