clldomps@cs.ruu.nl (Louis van Dompselaar) (04/22/91)
Hi there... Can anyone help me with my quest for a fast A/D for video purposes. I now work with a A/D which only is 3 bit. It uses the ordinary 8 comparators, combiner etc. I want at least 5 bits (to get 32 grey shades) and might even consider 3 x 5 bit for a lot of colours. Louis clldomps@praxis.cs.ruu.nl
elliott@optilink.UUCP (Paul Elliott x225) (04/24/91)
In article <1991Apr22.100053.1486@cs.ruu.nl>, clldomps@cs.ruu.nl (Louis van Dompselaar) writes: > Can anyone help me with my quest for a fast A/D for video > purposes. I now work with a A/D which only is 3 bit. > It uses the ordinary 8 comparators, combiner etc. > I want at least 5 bits (to get 32 grey shades) and might > even consider 3 x 5 bit for a lot of colours. Fujitsu makes 6 and 8-bit video A/D converters that convert at 20 M samples/sec (min, 30 M samples/sec typ), and they are pretty cheap (around $10). 6-bit : MB 40576 8-bit : MB 40578 I've only seen these in the catalog, so don't know if they are really available. Brooktree makes lots of video conversion chips; they tend to be slower than the above Fujitsu parts, but more highly integrated. They have a triple-ADC for color applications that looks interesting, and they will gladly mail you lots of spec sheets and app notes. They had a regular media blitz going on a few months ago, but *now*, I can't find their address in the stack of magazines on my desk. There was a survey article on the subject in _EDN_ magazine (or it may have been _Electronic Design_) a few months ago. Perhaps a dozen manufacturers were mentioned. Fujitsu Microelectronics, Inc: (408) 562-1000 -- Paul Elliott - DSC Optilink - {uunet, pyramid, tekbspa}!optilink!elliott "...We spread out over all levels of all governments. The threat of wars, famine, and environmental disaster disappear." - Marilyn Davis, Ph.D.
tomb@hplsla.HP.COM (Tom Bruhns) (04/25/91)
clldomps@cs.ruu.nl (Louis van Dompselaar) writes: > >Can anyone help me with my quest for a fast A/D for video >purposes. I now work with a A/D which only is 3 bit. >It uses the ordinary 8 comparators, combiner etc. If I read your address right, you ought to try Philips. They have some new chips for digital video processing, including A/D and D/A. They sent me a sample of the A/D-D/A pair, and I don't think I had even specifically asked for a sample. Don't recall the exact part number--sorry. It's an 8 bit 40MHz part, 24 pin DIP as I recall, for the A/D
jkubicky@nntp-server.caltech.edu (Joseph J. Kubicky) (04/26/91)
tomb@hplsla.HP.COM (Tom Bruhns) writes: clldomps@cs.ruu.nl (Louis van Dompselaar) writes: > >Can anyone help me with my quest for a fast A/D for video >purposes. I now work with a A/D which only is 3 bit. >It uses the ordinary 8 comparators, combiner etc. I used a Sony chip last summer - CXA1096P, I think. It went up to about 8MegSamp/Sec (8-bit flash type). It was much nicer to design with than a similar (at least, similar specs) Brooktree ADC, as the Sony had separate analog and digital supplies (as any good ADC should) while the Brooktree device (don't remember part #) functioned off a single supply and required a 'calibration' pulse every couple hundered usec or so (it was set up to happen in conjuction with the h-retrace, but just got in the way for my application). I also remember seeing an add from TRW around that time (end of last summer) that they were coming out with a video-bandwidth 8-bit flash device, but a few calls produced no specs or samples. Jay Kubicky