[sdiy] Video Synth...

[np]

Hi folks!

I'm playing with the idea to build a little video synth related circuits 
over the next days and I have a couple of questions. Hope you fine guys 
can help me even if it's a bit off-topic:

First problem: Signal generation for a PAL BAS signal.

For my video signal generator I need two sync-signals at relative stable 
frequencies. VSync is at 50Hz (well - that's easy). HSync at 15625 Hz.

I did some math and found out that I can get both frequencies by 
dividing down a 27Mhz crystal oscillator. That would be a cheap way to 
do this, but I haven't ever done anything that runs at these high 
frequencies. Will prototype board (the one with the dots, not the 
strips) work at that high frequencies or am I asking for trouble? For 
the frequency division job I plan to use the 74HCT4059.

Is there a simpler way to get my frequencies? Any idea that gets me out 
of the need to do HF stuff is welcome. Maybe I've overlooked another 
crystal that runs at a lower frequency, or I could do things with PLLs, 
or there is a even simpler solution. I don't want to use a 
microcontroller btw.


Next problem: for the image synthesis I need a bunch of two quadrant 
multipliers. I've looked up the datasheet of the SSM2024 as I have lots 
of them lying around here but I found nothing about their slew rate in 
the spec. _That_ makes me wonder how they perform at higher frequencies 
at all.

The worst thing they will do frequency wise is a VCA job for a 15khz 
saw-wave. I do not want much ringing and smearing at the sawtooth reset 
though.

 From experience, can you tell me how high the SSM2024 can practically go?

----
Nils