| Electronics > Projects, Designs, and Technical Stuff |
| Trouble getting full datasheet for an IC being sold on Mouser/Digikey |
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| wraper:
--- Quote from: Peeps on May 27, 2019, 02:34:16 am ---I was thinking using to use an HDMI/DVI transmitter IC like the TI TFP410, using the BT.656 encoded output from the Renesas TW8845. --- End quote --- Did you check resolution on that interface? https://en.wikipedia.org/wiki/ITU-R_BT.656 |
| Peeps:
--- Quote from: wraper on May 27, 2019, 02:41:31 am --- --- Quote from: Peeps on May 27, 2019, 02:34:16 am ---I was thinking using to use an HDMI/DVI transmitter IC like the TI TFP410, using the BT.656 encoded output from the Renesas TW8845. --- End quote --- Did you check resolution on that interface? https://en.wikipedia.org/wiki/ITU-R_BT.656 --- End quote --- I know its intended for a specific resolution but it looks like other manufacturers are using it to carry much higher pixel clocks/resolutions, like with the TDA19988 for instance. But I could be wrong. It's taken a while to find these IC's in the first place, as this is kind of new territory for me. Trying to find an analog video ADC > Scalar > DVI/HDMI transmitter. I know scaling can be implemented with an FPGA, as could HDMI output but I was hoping to more or less find something off the shelf that could accomplish this. --- Quote from: james_s on May 27, 2019, 02:39:03 am ---Don't you only need the license to actually call it HDMI? As I recall you can do DVI over the HDMI hardware interface. Of course none of this seems to affect China, I have a handy little $15 HDMI splitter that conveniently strips out the HDCP and outputs an unencrypted stream. --- End quote --- I've been researching this since I started this topic, and it seems like if your product uses HDMI in any way, you must be licensed for it. For instance, the developer of the OSSC (Open Source Scan Converter) left out HDMI on its first revisions and moved to DVI for this very reason. But they now include it, which makes me wonder if they got the license or just ignore it? Seems like a grey area. China also seems not very bothered by it as you mentioned, so not surprised they find ways around it/ignore it completely. |
| jeremy:
I'm not a lawyer, but I've seen a workaround in open source projects/dev kits where they do not pre-program the board with HDMI generating firmware/bitfile; the PCB just conveniently has TDMS pins from the FPGA connected to what appears to be similar to a HDMI connector ;) |
| Psi:
One thing you could try is search on china websites for someone selling that chip (aliexpress etc) Then message the seller and ask how much to buy the full datasheet for said chip. The one thing people in china like to do is make money :) Even if the seller doesn't have the full DS themselves they probably know someone who knows where a copy is stored on the net. Get them to send you the first 5 pages to prove they are legit before sending them any money. Pro Tip: Sometimes the hardest part of finding a datasheet on the internet is finding what the official filename is. Once you have that finding the file is usually pretty easy. I used to love those sites that hosted datasheets for a download fee. They would let you see the full filename and it was the click to download that was paywalled. :-DD |
| zitt:
Personally; if a company hides their full datasheet behind a "contact us"-wall - they get nixed from the design right away. Simply put; if they can't offer free, open full datasheets because they are worried about copy-cats or whatever, then they have lost the right to earn my business. There has only been a few companies that I've even seen put their data sheets behind some password protected website. Those companies deserve to loose my business. If this is indeed some kind of "key" secret; they still need to provide electrical and basic usage data in the datasheet. Wanting to harvest my email address for the sole purpose of marketing to me later is a very good way to end the relationship before it even starts. |
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