My customer needs to isolate its HDMI (from TX output to Screen/HDMI RX input).
Is there an isolator at ADI which can support HDMI rates and levels?
If not, is there a circuit note or application note available?
ADI do have the fastest and highest bandwidth digital isolator solution on the market, which may allow an isolation solution with a bit of work. ADN4650 isolates two channels of LVDS at up to 600 Mbps (TMDS could be coupled to the LVDS drivers/receivers with appropriate termination network). For HDMI, 600 Mbps per data lane would limit resolution to something like 1024x768 (maybe OK for industrial displays?). Another option is to convert from HDMI to parallel LVDS and use multiple ADN4650 isolators.
Although some circuit design and multiple ADN4650 would be required, the benefit is full signal fidelity (ADN4650 adds only ~2.6 ps of rms jitter), reinforced insulation for safety isolation, high immunity to surge and ESD across the isolation barrier, and robustness to fast changes in common mode voltages (high CMTI even coinciding with active data transitions). ADN4650 is now available in space-saving SSOP form factor, mitigating the PCB area requirements for multiple devices/channels.
Interface and Isolation Group
Would capacitive isolation be sufficient or must it also be ground isolated?
Please provide any available solution.
If the problem is just a TMDS common mode issue then 100nF ceramic capacitors can be used to isolate the connection, however the ground path would still exist.
If you need a full Galvanic break then there is no easy solution. ADI does not have a direct Galvanic isolation solution. HDMI is specified as a point to point communication.
A lot depends on the format. I'd look at HDbaseT solution
This thread is already marked as assumed answered. Could you please create new thread for new questions?
Thanks very much for understanding.
Do you think leaving a question without a valid answer is the goal of this community?
Conal has provided a good answer which should be part of this thread.
Sorry. I was looking in to the issue status and it was marked as assumed answered and thought like some other is creating follow up, now I understand that expert answer is given.
Sorry once again and thanks for your understanding.
Thank you Conal
Late answer but still a good answer.
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