Ian Canada's FiFoPi Ultimate has been designed to significantly reduce the jitter of the digital audio signal produced by a Raspberry Pi, before it can be transmitted back to your DAC. To do this, the module follows a 3-step process:
Buffering and reclocking of the digital audio signal using clocks (46.1520MHz and 45.1584MHz) and low jitter logic components. This step makes it possible not to depend on the non audio-dedicated clock of the Raspberry Pi. which generates jitter to work. Indeed, the Raspberry Pi's clock must perform a non-integer division to be able to convert its operating frequency to a clock frequency related to the audio. The clocks on the FiFoPi module are mounted on a stand and can therefore easily be replaced by even better models.
The FiFoPi uses built-in galvanic isolation to isolate the reclocking process and your DAC from the noise generated by the data processing performed by your Raspberry Pi due to the use of a DC-DC converter.
The use of a high-quality power supply separate from the Raspberry Pi (sold separately) for the reclocking process and clocks allows the FiFoPi to produce a very low jitter digital audio stream. Just as you can choose the quality of the clocks, you can select the power supply of your choice.
The module is Raspberry Pi HAT compatible, allowing an extremely simple integration. It supports PCM I2S up to 768kHz, native DSD up to DSD1024 and integrates a DoP decoder allowing the reading of the DSD from a PCM I2S signal provided by the GPIO of the Raspberry Pi. A 16bit PCM I2S to 32bit lossless converter allows the FiFoPi to work with DACs that do not support 16bit PCM I2S formats. The module also incorporates two isolated power inputs to provide clean power to both the FiFoPi and Raspberry Pi with the presence of an isolated GPIO connector.
The delivered FiFoPi Q3 is an updated version of the FiFoPi S2, benefiting from improvements to optimize signal quality.
What's new in Q3 version
This Q3 version of FiFoPi, a direct improvement of FiFoPi Q2, benefits from several enhancements that increase the performance of the module in order to offer you a sound reproduction of ever higher quality.
Supports oscillators (XO) with and without OE pin.
Uses 3.3V for a clean DC power supply. All LDOs have been removed to allow direct operation with a better 3.3V power solution via LifePO4 or ultra-capacitor.
Optional U.FL input for connection to an external oscillator via coaxial cable.
Supports XO (oscillator) Single Mode.
XO oscillator support in SMT format for easy replacement.
Isolated MUTE and DSD EN outputs for better operation with pure DSD DACs or external PCM/DSD DACs (via TransportPi or HdmiPi).
New high-speed 300MHz flip-flops to reduce the additional jitter of the final I2S/DSD reclocking.
Optimized decoupling networks to improve power supply performance.
The FiFoPi works with all HAT DACs and external DACs using a synchronous master clock (Sync Mode) to reduce jitter.
The Raspberry Pi and power supplies are sold separately (see accessories).
Supported sampling rates
PCM up to 32bit 768kHz DSD up to DSD1024 DoP
49.1520MHz + 45.1584MHz Mounted on SMT media and modifiable
1x GPIO 40 pins
1x GPIO 40 pins 2x MCLK on U-FL connector 1x SCK on U-FL connector 1x LRCK/D1 on U-FL connector 1x SD/D2 on U-FL connector 1x PH 2.0mm 4 pins connector for screen / external control panel
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