On 3/16/06, James Richard Tyrer <[EMAIL PROTECTED]> wrote: > Getting back to the RAMDAC. > > I can't find any that are not intended for TV use -- although I might > look some more if I have time. > > So, if we want to implement this, I would suggest that we have the SRAM > in the FPGA. Therefore, the only circuit requirement would be that ALL > the DAC inputs be connected to the FPGA then the implementation could be > done however we want by just changing the FPGA programing.
I guess I forgot to mention this. The FPGA has gobs of RAM in it. There will definitely be three LUTs for video. There's not a lot we can do to get MORE than 8 bits out, although we can temporally modulate it to trick the eye into seeing more shades. > > Do consider using the less expensive DAC which is made for this specific > use and has RS-170 buffers already built in. The 330MHz DAC isn't that bad, is it? We're not populating the highspeed ones. > Note that if we do go with the design, I should point out that the black > voltage for RS-170 is NOT 0 volts but rather 0.095 volts so a slight > bias is needed for the video out buffers. Perhaps this would be enough > so that they could be run with single supply if we used a different amp > that was designed for single supply. Isn't there only an amp for the highspeed DAC? Still, it's important that we get this right too. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
