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Need analog switch

L

Luhan

Jan 1, 1970
0
I'm working on a remote switchbox for s-video for my home entertainment
system.

I need some analog switches with resistance of 20 ohms or less
(assuming s-video is feeding 50 ohm loads). 4 (dual) inputs to one
(dual) output.

Handy if available in DIP, but I can handle SOIC. Cheap is also good.

Thanks,
Luhan
 
R

Rene Tschaggelar

Jan 1, 1970
0
Luhan said:
I'm working on a remote switchbox for s-video for my home entertainment
system.

I need some analog switches with resistance of 20 ohms or less
(assuming s-video is feeding 50 ohm loads). 4 (dual) inputs to one
(dual) output.

Handy if available in DIP, but I can handle SOIC. Cheap is also good.

Did it occur to you to have a look at the
manufacturers webpages ? What did you come
up with ?

Rene
 
L

Luhan

Jan 1, 1970
0
Rene said:
Did it occur to you to have a look at the
manufacturers webpages ? What did you come
up with ?

Yes, mostly clones of cd4051's with about 80 ohms. Some nifty ones
from Analog Devices with no prices quotes below 1000 each. Some
really pricey ones from DigiKey.

I can't be the first guy who would like a 4051 8x1 analog gate with
better resistance specs.

Luhan
 
F

Fred Bloggs

Jan 1, 1970
0
Luhan said:
I'm working on a remote switchbox for s-video for my home entertainment
system.

I need some analog switches with resistance of 20 ohms or less
(assuming s-video is feeding 50 ohm loads). 4 (dual) inputs to one
(dual) output.

Handy if available in DIP, but I can handle SOIC. Cheap is also good.

http://www.web-ee.com/Schematics/VSwitch/vswitch.htm and it looks like
75 ohms.
 
M

martin griffith

Jan 1, 1970
0
I'm working on a remote switchbox for s-video for my home entertainment
system.

I need some analog switches with resistance of 20 ohms or less
(assuming s-video is feeding 50 ohm loads). 4 (dual) inputs to one
(dual) output.

Handy if available in DIP, but I can handle SOIC. Cheap is also good.

Thanks,
Luhan
I'd go for buffered type switches, it means you can properly terminate
the video sources, rather than depend on the intrinsic on resistance
of the switches. Maxim had a reasonable range, last time I looked, a
year or so ago. BTW video is 75 ohm not 50

Cheap... well if the box lasts for 5 years, does it matter if the mux
is 10€ or 3€?


martin
 
S

Spehro Pefhany

Jan 1, 1970
0
Yes, mostly clones of cd4051's with about 80 ohms. Some nifty ones
from Analog Devices with no prices quotes below 1000 each. Some
really pricey ones from DigiKey.

I can't be the first guy who would like a 4051 8x1 analog gate with
better resistance specs.

Luhan

There are parts such as the Fairchild FSAV430QSCX 4-channel 1-of-2
switch. About USD 1.50 in 100's. 7 ohms max, and rated for high-res
video frequencies.
 
L

Luhan

Jan 1, 1970
0
martin said:
Cheap... well if the box lasts for 5 years, does it matter if the mux
is 10€ or 3€?

Only because I tend to do a bulk purchase when I find a generally
useful part. 10 at least, usually 25 to 50.

Luhan
 
W

Winfield Hill

Jan 1, 1970
0
Luhan wrote...
webpages? What did you come up with?

Yes, mostly clones of cd4051's with about 80 ohms. Some
nifty ones from Analog Devices with no prices quotes below
1000 each. Some really pricey ones from DigiKey.

I can't be the first guy who would like a 4051 8x1 analog
gate with better resistance specs.

There's a rather large set of 74hc4051 parts from various
manufacturers with dramatically-lower Ron specs. Yes, it's
true they have lower maximum supply voltages, but that's the
tradeoff we have for our MOS and CMOS integrated circuits.
 
D

Deefoo

Jan 1, 1970
0
Luhan said:
I'm working on a remote switchbox for s-video for my home entertainment
system.

I need some analog switches with resistance of 20 ohms or less
(assuming s-video is feeding 50 ohm loads). 4 (dual) inputs to one
(dual) output.

Handy if available in DIP, but I can handle SOIC. Cheap is also good.

Thanks,
Luhan

I like the HA4314 4-to-1 video mux which exists also as the AD8184. It is
not expensive and both can be gotten from Digikey and Radiospares.

--DF
 
R

Rene Tschaggelar

Jan 1, 1970
0
Luhan said:
Rene Tschaggelar wrote:




Yes, mostly clones of cd4051's with about 80 ohms. Some nifty ones
from Analog Devices with no prices quotes below 1000 each. Some
really pricey ones from DigiKey.

I can't be the first guy who would like a 4051 8x1 analog gate with
better resistance specs.

Maxim has some low resistance Switches.
Then there are a few from Siliconix,

Another option would be tristate output amplifiers,
of which BurrBrown and Linear Tech has some.
Have a look at the LT1203, a 150MHz video multiplexer.

Rene
 
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