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Switcher IC

I've seen ICs made specifically for video/audio switching...are there
any that are just generic? Say I just wanted to use it to switch the
path of a DC signal, or maybe I had a USB cable being routed through
it...just something that would purely be the equivelent of touching the
wires together with no processing. If not, are there any schematics
that would give me a circuit capable of doing this same thing? Ideally
it would be controlled by a low voltage signal, like a GPI trigger.
 
L

Lostgallifreyan

Jan 1, 1970
0
[email protected] wrote in
I've seen ICs made specifically for video/audio switching...are there
any that are just generic? Say I just wanted to use it to switch the
path of a DC signal, or maybe I had a USB cable being routed through
it...just something that would purely be the equivelent of touching the
wires together with no processing. If not, are there any schematics
that would give me a circuit capable of doing this same thing? Ideally
it would be controlled by a low voltage signal, like a GPI trigger.

DG211 is generic I think, they've been around for years and more than one
firm makes them. They're 16 pin DIL IC's containing 4 SPST switches each
with 50 ohm on resistance. You can make other combinations like DPST, or
even DPDT, and if you need certified break-before-make you can use a
resistor and a capacitor on some inputs to delay them by controllable
amounts.
 
L

Lostgallifreyan

Jan 1, 1970
0
[email protected] wrote in


DG211 is generic I think, they've been around for years and more than
one firm makes them. They're 16 pin DIL IC's containing 4 SPST
switches each with 50 ohm on resistance. You can make other
combinations like DPST, or even DPDT, and if you need certified
break-before-make you can use a resistor and a capacitor on some
inputs to delay them by controllable amounts.

To add stuff... meant control inputs. Logic 0 is on. DG212 is available
that reverses this.

They're available in SOIC too.

And being based on FET's the switch contacts are drain and source.
 
R

Roger Hamlett

Jan 1, 1970
0
I've seen ICs made specifically for video/audio switching...are there
any that are just generic? Say I just wanted to use it to switch the
path of a DC signal, or maybe I had a USB cable being routed through
it...just something that would purely be the equivelent of touching the
wires together with no processing. If not, are there any schematics
that would give me a circuit capable of doing this same thing? Ideally
it would be controlled by a low voltage signal, like a GPI trigger.
The 'generic' term, is a bilateral switch. One of the oldest, is the CMOS
4016/66 gate, which is four relatively high impedance examples, in an IC.
This has been used over the years to switch a variety of analog, and logic
signals. Some DC/AC solid-state relays, use the same basic technology, but
with opto-isolation added.
Sanyo, do the LC4966. Maxim does a whole range, including some different
layouts (DPDT etc.). Intersil do the DG411/412. There are dozens of
examples around, including some specifically built as multiplexors
(effectively 'change over' relays). AD, do a number of these.

Best Wishes
 
R

Ross Herbert

Jan 1, 1970
0
I've seen ICs made specifically for video/audio switching...are there
any that are just generic? Say I just wanted to use it to switch the
path of a DC signal, or maybe I had a USB cable being routed through
it...just something that would purely be the equivelent of touching the
wires together with no processing. If not, are there any schematics
that would give me a circuit capable of doing this same thing? Ideally
it would be controlled by a low voltage signal, like a GPI trigger.


Depending upon the actual requirements the common 4066
http://www.fairchildsemi.com/ds/CD/CD4066BC.pdf is fairly useful for
audio signal levels.

Other manfs' have their own devices such as Analog Devices
http://www.analog.com/UploadedFiles/Data_Sheets/82638392ADG431_2_3_c.pdf

DC switching is not really the province of CMOS switches except at
very low current levels.

This manufacturer
http://www.austriamicrosystems.com/03products/01_analog_switches.htm
makes IC devices capable of switching 250mA continuous.
 
S

Si Ballenger

Jan 1, 1970
0
I've seen ICs made specifically for video/audio switching...are there
any that are just generic? Say I just wanted to use it to switch the
path of a DC signal, or maybe I had a USB cable being routed through
it...just something that would purely be the equivelent of touching the
wires together with no processing. If not, are there any schematics
that would give me a circuit capable of doing this same thing? Ideally
it would be controlled by a low voltage signal, like a GPI trigger.

As others have mentioned, the 4066 chip might do the trick (but I
haven't tried one yet). Below is a page I have showing simple
video/audio switching using transistors. Bottom is my test setup
where you can switch between the cable, satellite, and analog cam
inputs.

http://www.geocities.com/zoomkat/ppswitcher.htm
http://www.geocities.com/zoomkat/ppswitcher-demo.htm
 
J

Jamie

Jan 1, 1970
0
I've seen ICs made specifically for video/audio switching...are there
any that are just generic? Say I just wanted to use it to switch the
path of a DC signal, or maybe I had a USB cable being routed through
it...just something that would purely be the equivelent of touching the
wires together with no processing. If not, are there any schematics
that would give me a circuit capable of doing this same thing? Ideally
it would be controlled by a low voltage signal, like a GPI trigger.
4066 ?
 
I've seen the 4066 before and the actual connection between the pins
will do what I want, but the control of it is the same as just having 4
relays it seems...correct me if I'm wrong, but you need 1 control
signal per connection? What I'm looking for would be basically like a
stepper relay....I just haven't seen a stepper relay with the amount of
connections I need.

Basically, if I have about 10 or 12 different sources, each dual pole,
and I want to be able to switch between them using two control signals,
is there a single IC solution? If not, any possible solution or place I
could look for one?
 
J

Jamie

Jan 1, 1970
0
I've seen the 4066 before and the actual connection between the pins
will do what I want, but the control of it is the same as just having 4
relays it seems...correct me if I'm wrong, but you need 1 control
signal per connection? What I'm looking for would be basically like a
stepper relay....I just haven't seen a stepper relay with the amount of
connections I need.

Basically, if I have about 10 or 12 different sources, each dual pole,
and I want to be able to switch between them using two control signals,
is there a single IC solution? If not, any possible solution or place I
could look for one?
4 to 16 line multiplexer.
requires 4 input binary coded digit
to select one of the 16 lines.
you can combine 2 switches in the 4066 chip
to switch on the same source signal.
you can use something line a AVR,PIC etc..
to control if that makes it easier for you.
or a simple binary flipflop chip for an up and
down counter.
 
R

Ross Herbert

Jan 1, 1970
0
I've seen the 4066 before and the actual connection between the pins
will do what I want, but the control of it is the same as just having 4
relays it seems...correct me if I'm wrong, but you need 1 control
signal per connection? What I'm looking for would be basically like a
stepper relay....I just haven't seen a stepper relay with the amount of
connections I need.

Basically, if I have about 10 or 12 different sources, each dual pole,
and I want to be able to switch between them using two control signals,
is there a single IC solution? If not, any possible solution or place I
could look for one?


There is no single chip device which will do what you are asking for
without additional circuitry.

Basically, what you are looking for is a 2 channel audio switchbox
which allows you to select 1 - n input sources using UP and DOWN
buttons or other input selection system, and routing the selected
input to a single output (ie, 1 - n input > 1 output). All of the
analog switches (such as the 4066) are just basic building blocks to
which you must add appropriate logic to achieve the desired functions.
 
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