Amazon.com: SDI to HDMI, 3G-SDI/HD-SDI/SD-SDI to HDMI Converter Adapter,SDI in HDMI out, SDI in SDI out Loopout 1080P @60Hz Video Audio Splitter, Auto Format Detection and Stereo Audio De-embedder, Support HDCP :
User manual Blackmagic Design Micro Converter HDMI to SDI (English - 811 pages)
Micro Converters – Tech Specs | Blackmagic Design
Micro Converters | Blackmagic Design
Blackmagic BiDirectional SDI/HDMI 12G Micro Converter walk-through: It has a secret feature! - YouTube