JustBoom Digi HAT - Electrocomponents

JustBoom Digi HAT - Electrocomponents
JustBoom Digi HAT - Product Description
The JustBoom Digi HAT is a high resolution digital audio output add on board for the Raspberry
Pi. Simply stack the plug-and-play add on board (HAT) onto your Raspberry Pi A+, B+, 2B or
the new 3B and it will be ready to use immediately. The JustBoom Digi HAT produces an
unmodified, high quality, digital audio data stream for bit-perfect transmission to your hifi
We’ve designed the JustBoom Digi HAT to be simple to install and use. With no soldering
required and all the mounting hardware already provided this product is suitable for absolute
beginners and seasoned professionals alike. Just connect your Digi HAT to external DAC or
amplifier/amplified speakers and you can be up and running quickly, enjoying flawless high
quality audio playback within minutes of setting up this Raspberry Pi HAT. We also include an
optional IR receiver to allow remote control operation of your Raspberry Pi.
The JustBoom Digi HAT Includes a 192kHz/24 bit digital audio chip with low jitter, bit perfect
digital output (S/PDIF) over optical or coaxial connectors for an uncompromised high quality
audio experience. The JustBoom Digi HAT includes an output transformer for full galvanic
isolation between your Raspberry Pi and your DAC on the coaxial output.
The HAT uses the I2S interface for its audio input which reduces CPU load on the Raspberry Pi
compared to USB solutions. It is also powered directly from the GPIO header so no extra cables
or power supplies are required to connect to the Raspberry Pi. All of the Raspberry Pi GPIO
pins are still accessible on the Digi HAT for easy customisation of your project - add additional
sensors, buttons, LEDs, rotary encoders or anything your heart desires.
Use cases
Pairing the Raspberry Pi with a high quality digital audio add on board provides the perfect
solution for a number of exciting projects and applications where the standard on-board audio
on the Raspberry Pi simply won’t cut it. Here are some possible use cases for the JustBoom
Digi HAT and your Raspberry Pi computer:
Circumstances where you need to have your streaming audio player (Raspberry Pi in
this case) located separately from your amplifier or DAC. This method is usually superior
to analog since the original digital signal is maintained until the amplification step
(theoretically leading to less degradation of the sound).
Streaming (either from cloud or local network) high-definition audio player
Multi-room audio player
Surround sound for media centre / set top box applications
And many many more….
Dedicated S/PDIF output interface chip supports up to 192kHz / 24bit resolution
Digital audio output over either optical (TOSLINK) or coaxial (RCA electrical) connectors
Low jitter, bit perfect digital output
Output transformer for galvanic isolation
Plug and play compatibility for ease of use
Software volume control from your Raspberry Pi
No soldering required
Powered by the Raspberry Pi GPIO header
Compatible with Raspberry Pi A+,B+, 2B and the new 3B (and also compatible with the
Raspberry Pi Zero, but we would recommend the JustBoom Digi Zero for this purpose)
Mounting hardware included
Optional IR receiver included in package
All Raspberry Pi GPIO pins still accessible via 40pin unpopulated extension header
Fully HAT compliant
Full driver support in Raspbian / NOOBS
Compatible with OSMC / RuneAudio / Volumio / Moode / PiCorePlayer / PiMusicBox /
OpenELEC and others
Technical Information
WM8804GEDS S/PDIF Transceiver with 24bit/192khz and has an integrated low jitter
PLL (50ps RMS)
DA101JC high bandwidth digital output transformer for galvanic isolation on electrical
(coaxial/RCA) output
Integrated EEPROM for automatic Raspberry Pi devicetree driver configuration and fully
HAT compatible
Digital signal output over S/PDIF with either optical (TOSLINK) or coaxial (RCA)
We recommend that if you are using the coaxial/RCA output that you connect the cable
shield to the ground on the DAC / amplifier you are using and make sure that the the
DAC / Amplifier is using a power supply with the ground pin connected. This will help to
reduce noise
Bit perfect digital audio transmission
Optional Vishay TSOP4838 IR receiver included in package (solder yourself if required)
While the hardware is able to output DTS/Dolby Digital, the Raspberry Pi software is not
currently able to support this. Let us know if you want to implement this and we will do
our best to help
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