4066 bandwidth up to almost 100MHz?

J

Joerg

Jan 1, 1970
0
Hello Hal,

Does the I2C command have to be fast, or just the last clock happen
at the right time?

The chip also support the old 100kHz speed IIRC. The reason why Jim
would need it fast is that he wants to switch frame by frame.
 
J

Joerg

Jan 1, 1970
0
Hello John,
Yes. A lot of tasty digital kit is now available for the high quality studio
end.
I must mention, that at the pleb end, i.e. the burgeoning UK video security
industry. It still relies near totally on analogue composite PAL. Indeed,
it's difficult to buy a (good!) security cam that offers digital out.
Stick a PAL cam on a pole, send the 6MHz balanced/unbalanced off for
monitoring and the car park riff-raff are still clearly identifiable.
Digitise and compress it a little and you're left with a nice pretty
picture but near useless for the intended purpose.


I agree. What I have seen of digital video and TV out here (Western US)
was rather disenchanting, to say it politely. Anything that moves fast
was distorted into jagged edges. They must have thought now that Claude
Shannon has passed away they could get away with less channel capacity
than he said. That just ain't working.

Studio stuff is a different matter. But for personal use analog TV is
just fine. Of course, all the bidders are already drooling over the
extra megahertzes that are going to be auctioned off soon. Or so they hope.

(I'm biased. I earn money from designing analogue matrix routers :).
john

Same here. I am an analog, ahem, analogue guy.
 
W

Winfield Hill

Jan 1, 1970
0
Kevin White wrote...
I find the classic 4016/4066 is inconvenient to use because it does not
have level shifters on the logic control lines although for video it
would be OK because of the limited voltage excursion of video (0-1V).

Indeed, that's one more reason why the 74hc4053, etc., is so
attractive. The level shifting also gets you twice the
supply-voltage range, to +/-7V, compared to 7V max otherwise.
 
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