Video sync pulse generator chips?

[Gary]

Hi,
I've been looking at some old designs and am wondering if the SAA1101 is
still the best option, or has it been superseded by something better?

TIA
Gary

 

[martin griffith]

Hi,
I've been looking at some old designs and am wondering if the SAA1101 is
still the best option, or has it been superseded by something better?

TIA
Gary

havent used the 110 in a long time. A quick look at the fairchild
tmc2490, video encoder, seems to be able to work in master mode,
generating syncs for slave equipment.
Think there may be different versions that originate colour bars as
well




martin

Three things are certain:
Death, taxes and lost data.
Guess which has occurred.

 

[Ron]

Hi,
I've been looking at some old designs and am wondering if the SAA1101 is
still the best option, or has it been superseded by something better?

TIA
Gary

Yes, microcontrollers!

Ron

 

[James Beck]

Yes, microcontrollers!

Ron

Yep, when all you have is a hammer, everything looks like a
nail.........

 

[Gary]

"Gary" <[email protected]> wrote in

Yes, microcontrollers!

That's really a better choice than an off the shelf chip? In what way?

Feel free to point me at any application circuits, needs to be genlockable
and work in PAL.

Regards
Gary

 

[Gary]

On Tue, 11 May 2004 22:11:25 +0100, "Gary"

havent used the 110 in a long time. A quick look at the fairchild
tmc2490, video encoder, seems to be able to work in master mode,
generating syncs for slave equipment.
Think there may be different versions that originate colour bars as
well

Thanks, but I cannot use PLCC devices.

 

[martin griffith]

Hi,
I've been looking at some old designs and am wondering if the SAA1101 is
still the best option, or has it been superseded by something better?

TIA
Gary

try this,
http://www.fairchildsemi.com/pf/74/74ACT715.html
ACT715 and ACT715-R are 20-pin TTL-input compatible devices capable of
generating Horizontal, Vertical and Composite Sync and Blank signals
for televisions and monitors. All pulse widths are completely
definable by the user. The devices are capable of generating signals
for both interlaced and noninterlaced modes of operation. Equalization
and serration pulses can be introduced into the Composite Sync signal
when needed.



martin

Three things are certain:
Death, taxes and lost data.
Guess which has occurred.

 

[Marlboro]

That's really a better choice than an off the shelf chip? In what way?

Feel free to point me at any application circuits, needs to be genlockable
and work in PAL.

Regards
Gary

FPGA, CPLD...

 

[Gary]

try this,
http://www.fairchildsemi.com/pf/74/74ACT715.html

Thanks Martin, although on quick perusal of the data sheet I think it
defaults to NTSC timings? Am not interested in something that requires
register programming.

Regards
Gary

 

[martin griffith]

Thanks Martin, although on quick perusal of the data sheet I think it
defaults to NTSC timings? Am not interested in something that requires
register programming.

Regards
Gary

I think thats the way it goes these days, make a multistandard ic,
cheaper than having several version. But i do understand your grief.
If I needed a spg, (which I dont) I would still probably go for the
TMC thingummy, and spend a bleeding week scribbling some dubious
software for it, the spend a another few days debugging it.
Oh for the good old days
one chip, one function!



martin

Three things are certain:
Death, taxes and lost data.
Guess which has occurred.

 

[Eric Pearson]

You could try the National 74ACT715 which
was available in DIP, if you just need the sync signals.
Digikey has them in stock.

Eric

 

[Winfield Hill]

Eric Pearson wrote...

You could try the National 74ACT715 which was
available in DIP, if you just need the sync signals.
Digikey has them in stock.

Now made by Fairchild. The 74ACT715PC is the 20-pin DIP part.
Newark has them for $9.00 each, p/n 35C0949. Farnell must
have them too, or they can deliver from Newark's stock.

"Gary" wrote ...

Thanks,
- Win

(email: use hill_at_rowland-dot-org for now)

 

[Glenn Gundlach]

Hi,
I've been looking at some old designs and am wondering if the SAA1101 is
still the best option, or has it been superseded by something better?

TIA
Gary

Hopefully pertinent questions:
1:Is this to run composite or component?
2:Is the video mono or color?
3:Is the genlock timing important?

If you're running composite, a sync generator is a big can of worms.
Subcarrier and its phasing relative to sync is a headache.
Component/mono will be easier. Monostables are terrible devices in a
sync generator just as its mechanical equivalent, the hourglass, is a
lousy clock. The adjustable timing maybe needed for genlock seems OK
for a monostable but I promise, you'll find it too unstable. Counters
off the master clock are good but use a lot of devices (in the TTL
world).

Since you don't like the idea of register loading or microcontrollers,
you might be better off checking used broadcast equipment. A 20 year
old Lietch or Tektronix would do just fine. Add up the parts and your
time and the used unit looks pretty good.
GG