josvdb@fwi.uva.nl (Jos van den Berg) (03/26/91)
I need a simple method to convert RGB video (1.00 V p-p) from a Booktree BT101 video DAC into composite video, preferably using only one IC and some off the shelf components.
dmturne@PacBell.COM (Dave Turner) (03/27/91)
In article <1991Mar26.125905.13464@fwi.uva.nl> josvdb@fwi.uva.nl (Jos van den Berg) writes: >I need a simple method to convert RGB video (1.00 V p-p) from a Booktree BT101 video DAC into composite video, preferably using only one IC and some off the shelf components. Check the National Semiconductor Special Purpose Linear Devices Databook for the LM1886 TV Video Matrix D to A and the LM1889 TV Video Modulator These two along with a suitable sync generator will produce both composite video and RF channel carrier. For a sync generator check the RCA Integrated Circuits for Linear Applications databok for the CD22402 Sync Generator. -- Dave Turner 415/823-2001 {att,bellcore,sun,ames,decwrl}!pacbell!dmturne
andreww@uniwa.uwa.oz (Andrew John Williams) (03/28/91)
dmturne@PacBell.COM (Dave Turner) writes: >In article <1991Mar26.125905.13464@fwi.uva.nl> josvdb@fwi.uva.nl (Jos van den Berg) writes: >>I need a simple method to convert RGB video (1.00 V p-p) from a Booktree BT101 video DAC into composite video, preferably using only one IC and some off the shelf components. > LM1886 TV Video Matrix D to A >-- >Dave Turner 415/823-2001 {att,bellcore,sun,ames,decwrl}!pacbell!dmturne NO!!! Not the LM1886! Its got 3 bit digital input for each of R,G,B. I think there's something a little more suitable in the Motorala Linear book, or the Phillips TV books. But I couldn't be bothered having a look for the chip numbers at the moment. Look them up yourself John West (stealing Andrew's account) Why do fish eat grapefruit?
andreww@uniwa.uwa.oz (Andrew John Williams) (03/29/91)
andreww@uniwa.uwa.oz (Andrew John Williams) writes: >think there's something a little more suitable in the Motorala Linear >book, or the Phillips TV books. But I couldn't be bothered having a look >for the chip numbers at the moment. Look them up yourself Sorry about that. I was having a bad day. And all those b****y freshers playing games on the Mac making it just about impossible to get at the books. But I've looked them up now... MC1377 video RGB to NTSC/PAL MC1374 RF oscillator/modulator and FM sound osc/mod The Motorola Linear book (or I'd guess the MC1377 data sheet) has an example circuit using both chips - RGB,sync in, RF out. Just the two chips and a few resistors/capacitors/those nasty inductor things I've just had a look at the Philips book, and it seems to be entirely PAL/NTSC/SECAM decoders, not encoders. But the Motorola chips should do you. John West (stealing Andrew's account) Who was that masked fish?