Identify video switch IC

[Andrew Gabriel]

I'm trying to identify a video switch IC which is used on a Video
capture card for which I'm writing a driver. Unfortunately, the
manufacturer has ground the markings off the chips, just to make
life a little harder. The IC has 8 inputs and at least 2 outputs,
probably arranged as two 4-input 1-output switches. It handles
composite video signals directly. It is a 16 pin minature dual-in-
line surface mount chip. I believe the pin connections are:

Pin
1 input select
2 input select
3 video input
4 video input
5 video input
6 video input
7 video output
8 ground
9 video output
10 video intput
11 video intput
12 video intput
13 video intput
14 input select
15 input select
16 +ve supply

If anyone recognises this chip, could you let me know the part
number (and point me to a datasheet if you know where that might be)?

Thanks.
--
Andrew Gabriel

 

[Joerg]

Hello Andrew,

No idea but if you don't get any takers I would start at Maxim. They
make a lot of this stuff.

Regards, Joerg

http://www.analogconsultants.com

 

[Andrew Gabriel]

In article <q%Lpe.1417$bv7.219@newssvr21.news.prodigy.com>,
Joerg <notthisjoergsch@removethispacbell.net> writes:

Hello Andrew,

No idea but if you don't get any takers I would start at Maxim. They
make a lot of this stuff.

Thanks. I browsed through their chips, and they are the right
sort of thing, but there isn't one that matches the pinout.

--
Andrew Gabriel

 

[Wouter van Ooijen (www.vo]

Thanks. I browsed through their chips, and they are the right
sort of thing, but there isn't one that matches the pinout.

Philips would be another suggestion.


Wouter van Ooijen

-- ------------------------------------
http://www.voti.nl
Webshop for PICs and other electronics
http://www.voti.nl/hvu
Teacher electronics and informatics

 

[Clint Sharp]

In message <42a76bfa$0$38039$5a6aecb4@news.aaisp.net.uk>, Andrew Gabriel
<andrew@cucumber.demon.co.uk> writes

I'm trying to identify a video switch IC which is used on a Video
capture card for which I'm writing a driver. Unfortunately, the
manufacturer has ground the markings off the chips, just to make
life a little harder. The IC has 8 inputs and at least 2 outputs,
Might make life easier if you provide details of the card and

surrounding chips as well, loads of PC based cards are just an
implementation of an application note for the capture IC.
--
Clint Sharp

 

[R.Lewis]

"Clint Sharp" <clint@clintsmc.demon.co.uk> wrote in message
news:VhXIRyBsmbqCFwSe@clintsmc.demon.co.uk...

In message <42a76bfa$0$38039$5a6aecb4@news.aaisp.net.uk>, Andrew Gabriel
andrew@cucumber.demon.co.uk> writes
I'm trying to identify a video switch IC which is used on a Video
capture card for which I'm writing a driver. Unfortunately, the
manufacturer has ground the markings off the chips, just to make
life a little harder. The IC has 8 inputs and at least 2 outputs,
Might make life easier if you provide details of the card and
surrounding chips as well, loads of PC based cards are just an
implementation of an application note for the capture IC.
--
Clint Sharp

People that grind the markings off chips are only ever very small time
operators.
Do not spend too long writing your driver (if it is for commercial use) -
there will not be much of a market using that particular video pcb.

 

[Andrew Gabriel]

In article <VhXIRyBsmbqCFwSe@clintsmc.demon.co.uk>,
Clint Sharp <clint@clintsmc.demon.co.uk> writes:

Might make life easier if you provide details of the card and
surrounding chips as well, loads of PC based cards are just an
implementation of an application note for the capture IC.

The card is sold under the name Grandtec Grand X Guard.
There's very little on it. The heart of it is Conexant Fusion BT878A
PCI video decoder. This decoder has 4 inputs and an internal switch.
However, the card has 16 inputs and an extra 2 switching chips,
which I was trying to identify. The switch control lines are driven
directly from the general purpose IO lines on the BT878A, and it
was specifically the driving of these lines I was trying to get to
work.

In the end, I have worked it out by trial and error driving of the
switch control lines, and got the driver working. It would still be
interesting to identify these chips, but it's not holding up my work
on the driver anymore.

--
Andrew Gabriel

 

[Jerry R]

"Wouter van Ooijen (www.voti.nl)" <wouter@voti.nl> wrote in message
news:42a8af5f.1503464347@news.xs4all.nl...

Thanks. I browsed through their chips, and they are the right
sort of thing, but there isn't one that matches the pinout.

Philips would be another suggestion.


Wouter van Ooijen

Intersil is another place to try.

....jerry