Digital interface with HDMI / MHL input to I2S / Coaxial / Optique output


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Module HDMI extractor to I2S / Coax / Optics

HDMI A / V to I2S audio / Coaxial / Optical / HDMI - Compatible MHL

Extractor HDMI digital interface unit

This module is an HDMI extractor. It allows to recover the digital audio stream of a digital HDMI source (including MHL) towards a digital coax port / optical or HDMI (I2S via HDMI).

This interface will be particularly useful in complex home theater installations, where multiple sources are likely to successively vary between audio and video functions.

This type of module is ideal in that it separates the video and audio streams to convenience while maintaining appropriate audio formats for advanced facilities.

It has a function of ressampling to select between an output 2-channel / 5.1 channels or audio output corresponding to the input (bypass).


Chip EP94Z3

The digital audio extraction is accomplished by EP94Z3 , a HDMI 1.4b standard compliant chip.

This component is compatible both with the single HDMI input sources and with 1.1 MHL (HDMI Adapter - USB typically used to connect a smartphone to a HDMI input).

The EP94Z3 chip is able to address the various digital protocols, requiring multiple levels of accuracy of the signal. It has an HDMI repeater function, which also allows the use of longer cables to cover a greater distance.

Its high compatibility with digital audio protocols make it a very practical accessory to be prepared for any audio / video connectivity problems. Moreover the module has support for LPCM support, HD Audio & DSD Audio. The Audio Soft mute approach is also supported.

Full digital connectivity

The module offers many possibilities regarding connections since it is able to recover the digital audio stream via S / PDIF towards a  Toslink Optical connector and a Coaxial connector. Both are already mounted on the board.

I2S output via HDMI LVDS is also available through an HDMI connector. The latter is already mounted on the PCB as well.

Similarly, two I2S outputs / DSD are available. One is connected to a connector 2.54mm NMR 6 male pins; the second is in the form of solder pads.

SPDIF coaxial digital outputs HDMI Optical I2S DSD

PCB distances


Connection Diagram

TypeHDMI extractor
OutputsHDMI / LVDS I2S PS AUDIO Format / Optical / Coax / I2S.
Power Supply5VDC Not provided
Power connector5.5 / 2.5mm
Dimensions86.2 x 67.15 mm
Parts supplied
HDMI Modulex1
I2S cable XH 2.54 female 6 pinsx1
Data sheet
OutputOptical Toslink
OutputCoaxial SPDIF
OutputI2S LVDS via HDMI
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Digital interface with HDMI / MHL input to I2S / Coaxial / Optique output
A good choice to extract audio stream from BlueRay/DVD a sent to a better external DAC.
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