Eric Smith wrote:
>

<snip>

> I recently discovered a nifty Motorola chip, the MC44145, which includes both
> a sync separator and a PLL, and is specifically intended for generating a
> clock for a video digitizer.  It's reasonably inexpensive, but since I
> already have a working design I don't plan to switch.
>
> You might also want to look at the data sheet for the MC44011 and Application
> Note AN1548.
>
> Elantec data sheets are available from http://www.elantec.com/
> Motorola data sheets are available from http://motserv.indirect.com/
>
> Cheers,
> Eric


It was only last night that I stumbled upon the Motorola parts
that you mention Eric. And since this is my current project,
I've also stumbled upon many more. Perhaps the ulitimate in Video
Digitization is Philip's TDA8752. It has all kinds of integrated
goodies for RGB digitization:

Three 250Mhz Amplifiers BW (R, G, and B)
Gain control for each color
Clamp control for each color
Triple 8-bit ADC
80Mhz sampling rate
PLL with the divide-by-N counter
And of course, I2C controlled.

Philip's home page is:
http://www.semiconductors.philips.com/
And if you want the TDA8752 data sheet in PDF format:
http://www.semiconductors.philips.com/acrobat/2256.pdf

The only problem is that this chip appears to be fabicated
from the same stuff Maxim uses: unobtainium.

So, as far as I can tell the only way to implement an RGB
digitizer (which is not how this thread began, but IS what
I'm trying to design) is to interconnect several IC's. Here's
a little bit of what I have found available:

Analog processing. These are chips that interface to incoming
RGB signals and allow you to do things like control the brightness,
contrast, and individual RGB gains.

TDA9206 - SGS-Thomson
LM1205/LM1207 - National Semiconductor
MC13081X - Motorola

PLL's/Clock Generators. These chips will synchronize to the
horizontal sync pulse and generate the high frequency pixel
clocks.

ICS1567 - Integrated Circuit Systems, Inc.
TLC2933 - Texas Instruments
CGS410 - National Semiconductor (integrated divide by N counter)

A/D converters.

TDA8707 - Triple RGB 6-bit, 35 Mhz; Philips
TDA8714 - 8-bit, 75Mhz; Philips
MAX1114 - 8-bit, 150Mhz (ECL); Maxim


There is much more...

Has anyone else worked on something like this? I'd be glad to
hear what you have to say...

Scott