MEHARP01@ulkyvx.BITNET (Michael Harpe) (02/13/91)
Can someone out there point me to an NTSC sync generator chip? I am designing a WEFAX decoder that will output video with interlaced sync and i'm trying to keep the parts count down. I checked my National and Motorola libraries with no luck. Please respond direct to me. Thanks in advance! Mike Harpe, N4PLE University of Louisville
tomb@hplsla.HP.COM (Tom Bruhns) (02/15/91)
>Can someone out there point me to an NTSC sync generator chip? I am designing >a WEFAX decoder that will output video with interlaced sync and i'm trying >to keep the parts count down. I checked my National and Motorola libraries >with no luck. National used to make one -- MM5230??? I don't recall, but a CRTC IC is generally a more useful way to do this. A 6545 can be programmed to generate pretty much standard NTSC video, interlaced and all. It also generates all the memory scanning info you should need at the same time. I haven't kept up lately, but suspect there are a lot of CRTC chips that could do similarly
myers@hpfcdj.HP.COM (Bob Myers) (02/16/91)
>Can someone out there point me to an NTSC sync generator chip? I am designing >a WEFAX decoder that will output video with interlaced sync and i'm trying >to keep the parts count down. I checked my National and Motorola libraries >with no luck. If you mean a chip which will produce syncs and blanking at the NTSC rates, just about any of the video timing ICs intended for computer displays (such as the venerable 6845), with the proper clock and programming, will do it. If you're asking how to combine the syncs with the video, try an NTSC modulator chip such as the MC1377 from Motorola. (Or if you're going to be doing the conversion from digital video info to the analog version anyway, just about any video DAC includes sync and blanking inputs. Try Brooktree or Analog Devices.) Bob Myers KC0EW HP Graphics Tech. Div.| Opinions expressed here are not Ft. Collins, Colorado | those of my employer or any other myers@fc.hp.com | sentient life-form on this planet.
gary@brb.isnet.inmos.co.uk (02/21/91)
In article ??? MEHARP01@ulkyvx.BITNET (Michael Harpe) writes: > Can someone out there point me to an NTSC sync generator chip? I am designing > a WEFAX decoder that will output video with interlaced sync and i'm trying > to keep the parts count down. I checked my National and Motorola libraries > with no luck. > > Please respond direct to me. Thanks in advance! The information may be of use to other people, so I hope you don't mind me posting this reply. Try the SAA1043 "Universal Sync Generator" (not sure of the manufacturer). The part appears on page 416 of the Maplin Electronics catalogue. It writes "The IC generates the synchronising waveforms required in all types of video source equipment e.g. video cameras, film scanners, video games, computer displays etc. The device is programmable to suit standards SECAM1, SECAM2, PAL/CCIR, NTSC1, NTSC2 and PAL-M; the video game 624 and 524 line standards; and can be synchronised to an external sync signal". It is a 28 pin device, and costs 9 pounds (about 15 dollars). Disclaimer - I have never used this device, but it sure sounds suitable. Maplin Electronics is a mail order company which supplies a wide range of electronic components to the hobbyist. They started off small, and grew large as a result of good service. They now have several retail outlets around the country (in the larger cities such as Bristol). These outlets are very good (as compared with T*ndy/R*dio Sh*ck), and have an enormous selection of components/kits/books/tools etc. Their catalogue is over 600 pages in size and costs 2 pounds 50 pence. It is now available from most reputable newsagents (no US translation :-) ). They do accept overseas orders. They also run a bulletin board type service, over which you can order parts and pay by credit card. Note: I am not connected in any way with this company - just a satisfied customer. Other video related parts they currently sell: LM1881 "Sync Separator" ; TEA2000 "PAL Colour Encoder" (RGB digital to PAL video - NTSC also supported) ; ZNA234E "TV Pattern Generator" (generates crosshatch/dots/ greyscale test patterns in PAL/NTSC video standards). Maplin also produce their own electronics magazine, and their projects tend to feature devices which they sell. They recently had projects on both the TEA2000 and ZNA234E parts, and so PCB's and kits are available. Please mail me directly if you require any more details. I believe another poster may be interested in the TEA2000. --Gary ============================================================================ Gary Morton Inmos Ltd, Aztec West, Bristol | EMail(UK) ----------| +44 454 616616 X523 |------------| gary@brb.isnet.inmos.co.uk The opinions above are my personal views | EMail(ROW) and may not reflect Inmos policy. | gary@brb.isnet.inmos.com ============================================================================
mmm@cup.portal.com (Mark Robert Thorson) (02/21/91)
The National chip is the MM5320. It requires +5 and -12, and it runs hot. Ferranti makes (or used to make) a similar 5V-only chip. I've used the 5320 several times, and it can be a pain. Be sure to decouple the -12 supply close to the package with a big cap.
dmturne@PacBell.COM (Dave Turner) (02/22/91)
In article <39458@cup.portal.com> mmm@cup.portal.com (Mark Robert Thorson) writes: >The National chip is the MM5320. It requires +5 and -12, and it The RCA CD22402 is another chip that is becoming popular and is now easier to find. Digikey sells them for about $10.50 . The data sheet is in a RCA book that costs about as much but its worth it if you are serious about using the CD22402. -- Dave Turner 415/823-2001 {att,bellcore,sun,ames,decwrl}!pacbell!dmturne
tomb@hplsla.HP.COM (Tom Bruhns) (02/27/91)
Yet another sync generator: just saw it in a (very) recent National linear update flyer. "LM1882 Programmable Video Sync Generator Features o Fully definable video sync generation o Interlace or non-interlace formats o Separate H & V or composite syncs o Default RS-170 NTSC on power-up o Up to 100 MHz clock Benefits o Any-standard adaption o Ideal for TV as well as workstation needs o To handle the system requirements o Mask-programmed into registers o Allows for maximum flexibility and resolution " (The last three lines look like a layout person or marketeer took some liberties...)