Copyright (c) 2026 Antmicro
This project contains open hardware design files for Antmicro's SDI to Fiber Adapter. This device allows extending transmission distance of SDI cameras and video accessories, and improves electromagnetic immunity due to fiber-optic transmission.
The board includes BNC connectors for SDI input and output, an SFP+ connector (compatible with a range of SDI SFP modules), a USB-C power input and a goldpin header exposing I2C (default) and SPI (optional) buses for configuration.
SDI signal conversion is implemented with an LMH0397 3G-SDI bidirectional I/O with an integrated reclocker, which is pin compatible with LMH1297 for possible upgrade to 12G-SDI. The SDI signal is routed to an SDI SFP+ module (e.g. Transwan CSP13F6-11-SDI), which transmits the signal over a fiber-optic cable. On the receiving end, a second SDI-Fiber Adapter unit can be used to convert the optical signal back to SDI, which is then exposed on the output BNC connector. The device supports simultaneous transmit and receive operations using a bidirectional SDI SFP transceiver. Communication with the SFP module and LMH integrated circuits can be established over I2C, which is the default interface. The SPI interface can be used to communicate only with the LMH integrated circuits and requires populating the related DNP components.
The PCB design files were prepared in KiCad 9.x.
- Bidirectional (3G-SDI) video conversion
- Includes 2x LMH0397 3G-SDI bidirectional I/O with an integrated reclocker, pin compatible with the LMH1297 for possible upgrade to 12G-SDI
- Supports SMPTE ST-424 (3G), SMPTE ST-292 (HD), and SMPTE ST-259 (SD), as well as SMPTE ST-2082-1 (12G), SMPTE ST-2081-1 (6G) when used with LMH1297
- Two BNC ports for SDI input and SDI output
- SFP+ connector for connecting a 3G-SDI SFP transceiver module for fiber-optic transmission
- I2C interface to handle the configuration of the SDI Bidirectional I/O as well as SFP module
- Optional SPI interface to handle configuration of the SDI Bidirectional I/O
- Power supply via USB-C (5V)
- 70 x 42 mm (2.76 x 1.65 inch) PCB outline
The SDI-Fiber Adapter is electrically compatible with the following accessories developed by Antmicro:
Please refer to the schematics if you plan to use it with any other 3-rd party SDI equipment.
The main directory contains KiCad PCB project files, the LICENSE, this README file, and the img directory containing graphics for this README.
This project is published under the Apache-2.0 license.
