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The Allo Digione interfaces are currently the best digital SPDIF outputs to Raspberry Pi. They connect directly to the RPI by GPIO and provide digital transfer while correcting jitter characteristic of a bare SBC.
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Find here a selection of useful and/or essential accessories for this product. These are specially selected by the Audiophonics team according to the characteristics of the product.
Digital interface Raspberry Pi 3/4 - Dual power supply - NDK clock
The Allo Digione interfaces are currently the best SPDIF /digital outputs for Raspberry Pi. They connect directly to the RPI by GPIO and provide digital transfer while correcting the jitter found in any ordinary SBC. This interface also provides the RPI with a 75 Ohm BNC and RCA Coaxial Digital 24bit 192khz output. Its rise time is 1 ns and the voltage completely meets the coaxial / BNC standards (550mV coaxial). This interface is capable of transforming a digital limited source such as an SBC into a true high-fidelity device with a remarkably low jitter of 400fs.
For this SIGNATURE version the Digione interface team added latest type of NDK oscillatorrs iultra low jitter and phase noie. The audio circuitry also hosts a supercapacitor to enhance the power supply and to provide partial protection in case of sudden voltage off-state.
The PCB is now divided into two parts, allowing the circuit more space than the previous version.
Its design is less subject to space limitations and can accommodate compex network and more subtle components than before. Clocks and buffers enjbenefits from better film capacitors.
In addition to this first advantage, the choice of dividing the two PCB is mainly explained by a desire to overcome the technical limitations (power supply management) in a Raspberry Pi .
The lower PCB and has its own standard power input (5V / 2-3A). This power supply is also used to power the PI.
The lower PCB working in duo with the RPI is the "dirty side" which gathers every component that may generate unwanted noise or cause signal degradation.
Naturally, this "dirty" portion is isolated (galvanic insulation) from the rest of the circuit that is dedicated strictly to audio processes.
On the other hand, the upper PCB is the "clean side" which focuses all critical and high sensitivity components. This circuit is isolated from the second PCB and Pi. It can (and must) be powered separately.
If the prospect of a double power supply for one interface can seem restrictive, the return on investment is considerable:
The "clean" power is extremely flexible. Since it only bear sensitive audio components, the technical specifications that it has to meet are less heterogeneous. It is much easier to achieve satisfactory operating conditions with this type of configuration. The circuit will operate without failures with voltages from 5 to 6V as long as it is provided with at least 100mA current. Whether a battery, a linear power supply or even a good switching power supply is up to you.
The second , more subtle, benefit is also the most interesting in the context of an audio project.
The 2x PCB / 2x separate power means that any improvement in the "clean" circuit power supply will be an improvement of higher repercutions than with a single-supply scheme.
In other words, the Digione Signature interface will not "waste" the potential of an improved power supply on components that do not specifically need the best power supply there is. Thus it can focus especially on the critical audio components.
The design 2PCB / 2PSU is able to make the most olf any improvement made on the upper floor power supply. Conversely, the digital interface is more likely to "forgive" the user if the power on the "dirty" side is not as good as it could. This asymmetry is very relevant in audio with multi-PSU systems.
Specifications | |
---|---|
Type | digital interface |
Input | Raspberry Pi GPIO |
Output | 1x BNC 1x RCA Coaxial |
Regulators | 10x LDO |
Filters | 12x LPF |
Galvanic isolation | Yes |
Cchip | WM8805 |
Supercapacitor | Yes |
Oscillators | NDK |
Jitter | 0.4fs |
Noise | 50UV |
Power Supply | +5V (via USB-C) |
Driver | Works with any former driver version of DIGIONE |
Package | Delivered assembled (2 modules + spacers + screws) 2x female Jack DC 5.5 / 2.5mm to male USB-C adapter |
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