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Teletext decoders

F

Fred

Jan 1, 1970
0
I know that Philips have the SAA5264/5 teletext decoder but have been quoted
a lead time of 17 weeks. Are there any alternative manufacturers or am I
stuck?

Many thanks for any help.
 
F

Fred

Jan 1, 1970
0
Baphomet said:
Their website say this is obsolete and to contact Rochester Electronics.

This is a teletext system which occupies a 19" 1U rack and not very
suitable. I haven't a clue how much this would cost.

This is the IC I would like to use but with a 17 week lead time leaves me in
the poo if I design it in.

Thanks for your help.
 
F

Fred

Jan 1, 1970
0
free said:
You can find in small shop, for example
SAA5231 5,30 euros, SAA5244 38,00 euros and SAA5246Ap 9,10euros
http://www.electronique-diffusion.com (french)
shop for repair
XF

I tried the website but it seems to be own at the moment. I'll try again
later. Unfortunately I require around 1000pcs a year so too large a volume
for samples and too small for any manufacturer or distributor to care about.

Many thanks.
 
F

free

Jan 1, 1970
0
Fred said:
am
Their website say this is obsolete and to contact Rochester Electronics.


This is a teletext system which occupies a 19" 1U rack and not very
suitable. I haven't a clue how much this would cost.


This is the IC I would like to use but with a 17 week lead time leaves me in
the poo if I design it in.


Thanks for your help.
You can find in small shop, for example
SAA5231 5,30 euros, SAA5244 38,00 euros and SAA5246Ap 9,10euros
http://www.electronique-diffusion.com (french)
shop for repair
XF
 
F

Fred

Jan 1, 1970
0
Fred said:
I know that Philips have the SAA5264/5 teletext decoder but have been quoted
a lead time of 17 weeks. Are there any alternative manufacturers or am I
stuck?

Many thanks for any help.

I have just been told of the TVP5145 which is a video encoder as well. Has
anyone got their opinions of this device. Seems overkill for what I need!
 
J

Jeroen

Jan 1, 1970
0
Fred said:
I have just been told of the TVP5145 which is a video encoder as well. Has
anyone got their opinions of this device. Seems overkill for what I need!

if this means you can complete your project (in time) and have a happy
customer, why would you care?

Jeroen
 
T

Tim Shoppa

Jan 1, 1970
0
Fred said:
I know that Philips have the SAA5264/5 teletext decoder but have been quoted
a lead time of 17 weeks. Are there any alternative manufacturers or am I
stuck?

It's more than just a decoder, it also generates the video pages and has an 8051
core on it too. Great if you are putting it in a TV, not so good if you just
want the decoded teletext for use in a computer.

Assuming that you aren't building a TV from scratch: What features do you
actually want to use?

Tim.
 
F

Fred

Jan 1, 1970
0
Tim Shoppa said:
It's more than just a decoder, it also generates the video pages and has an 8051
core on it too. Great if you are putting it in a TV, not so good if you just
want the decoded teletext for use in a computer.

Assuming that you aren't building a TV from scratch: What features do you
actually want to use?

Tim.

I had assumed it was the core 8051 which did all the control and interfacing
with the display hardware. The only digital interface is through I2C and
you have control over a number of PWM outputs and a few more I/O. I felt
the fact the core was a 8051 was of little consequence to the user/designer.

I wish to decode CVBS to RGB teletext video information. I agree that some
of the other features may be superfluous. With the lack of teletext
decoders the fact there are a few additional unused features is not a
problem.
 
T

Tim Shoppa

Jan 1, 1970
0
Fred said:
I had assumed it was the core 8051 which did all the control and interfacing
with the display hardware. The only digital interface is through I2C and
you have control over a number of PWM outputs and a few more I/O. I felt
the fact the core was a 8051 was of little consequence to the user/designer.

I wish to decode CVBS to RGB teletext video information.

That's what the SAA5264 does, for the most part. It obviously was
designed to go inside the TV and not outside, although I'm sure that
it can be put outside with a little extra effort.

Writing software for the 8051 core may not be
so easy... there certainly aren't enough details in Phillip's online
datasheet to do anything useful.

If this is a one-off decoder, and/or it's not going into a TV, my gut
feeling is that it'd be easier to find one of the PC video cards that
has teletext decoding features. I'll grant you that for those,
the programming interface doesn't seem very clear either. It's starting
to look a small FPGA designed from scratch would be the least opaque solution.

Tim.
 
F

Fred

Jan 1, 1970
0
Tim Shoppa said:
That's what the SAA5264 does, for the most part. It obviously was
designed to go inside the TV and not outside, although I'm sure that
it can be put outside with a little extra effort.

Writing software for the 8051 core may not be
so easy... there certainly aren't enough details in Phillip's online
datasheet to do anything useful.

If this is a one-off decoder, and/or it's not going into a TV, my gut
feeling is that it'd be easier to find one of the PC video cards that
has teletext decoding features. I'll grant you that for those,
the programming interface doesn't seem very clear either. It's starting
to look a small FPGA designed from scratch would be the least opaque solution.

Tim.

I'm not designing a one off decoder or I would have done something along the
lines you suggest or ripped apart a TV. Reading the datasheet, its not
obvious that you need to do any coding for the 8051 core. Just requires its
I2C interfacing driving for control.

Many thanks for your input.
 
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