Need chroma demodulator ic

[MacGyverS2000]

Working on a new SD/HD-TV toy. I need to split an NTSC composite video signal (yellow RCA cable out of most video components) into either component (YCbCr) or RGB video lines. Much to my surprise, I'm having a difficult time finding an inexpensive single-chip solution (even circuit schematics are seemingly hard to come by). Links, chips, suggestions welcome...


Dan - Owner

http://www.Hi-TecDesigns.com

 

[MacGyverS2000]

BTW, I've found a few chips by TI, but their functionality is significantly higher than what I really need (80-pin LPQFs with I2C interfaces, etc.). I simply want a composite video signal stripped into YCbCr... (already have an SD/HD-capable chip to pass the signal into).

Dan - Owner

http://www.Hi-TecDesigns.com

 

[jimkirk]

Texas Instruments TVP5150AM1PBS

2 composites or 1 S-video input (NTSC/SECAM)

YCbCr 8 bit 4:2:2 output

Does this help?

 

[jimkirk]

You snuck in while I was replying.

Yeah, the TI chip does MacroVision DRM detection and all sorts of other things. Finding a good old-fashioned simple one function video chip these days isn't easy.

http://www.converters.tv/products/pal_to_pal_converter/444.html

has a box that looks like it does what you want. 145 USD. Maybe you can find out what they use.

http://www.analog.com/en/subCat/0,2879,760%5F793%5F0%5F%5F0%5F,00.html

has several converters, but nothing with fewer than 40 pins.

Good luck!

 

[Madcow]

http://www.svideo.com/svideoscart.html

http://www.svideo.com/rcatosvideo.html

These guys might have it.
I've found a svidio to scart and then a scart to rgb.

 

[MacGyverS2000]

I was hoping to find a chip that kept it all analog to cut down on the number of lines running between board sections/chips. It seems all I've come across so far (the 5150 included) want to digitize it for you. Looks like I'll have to go digital from the get-go.

Considering my few options and what I'd like this unit to support, I think I'm going to go with the TVP7000 for HD support and the TVP5146 for SD support, then wrap all of those output lines to a CPLD for combining the data. A PIC should more than suffice for I2C control. A lot more processing power than I had intended for this project, but I also have no interest in wasting much time searching for a more simple solution (money isn't that critical this time around, my time is more precious). Even in small quantities (<25), total cost for the two chips, CPLD, and PIC should be under $30.

Thanks guys!


Dan - Owner

http://www.Hi-TecDesigns.com

 

[felixc]

20 years ago I used a Motorola full analog video decoder that was doing exactly what you are looking for, as the front end to a video digitizer. I can't remember the part number. Found nothing on google about a Motorola decoder.

I see something about the NEC uPD1830. Also the TDA3330. Just things that you can get from brokers though. Is it for any volume?

 

[MacGyverS2000]

Yes... I definitely cannot rely on end-of-life parts or surplus stocks.


Dan - Owner

http://www.Hi-TecDesigns.com

 

[IRstuff]

Have you looked at formerly Philips Semi:

http://www.nxp.com/products/dmv/video_decoders/index.html

http://www.nxp.com/products/dmv/pctv_engine/index.html

TTFN

Eng-Tips Policies FAQ731-376

 

[MacGyverS2000]

Those NXP chips are monster BGAs meant for PCI cards and such... I'll think I'll stick with my 80/100-pin LPQFs

Dan - Owner

http://www.Hi-TecDesigns.com