Teletext decoders

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Their website say this is obsolete and to contact Rochester Electronics.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.

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.

"Fred" a écrit dans le message news:

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am

in

You can find in small shop, for example SAA5231 5,30 euros, SAA5244 38,00 euros and SAA5246Ap 9,10euros

(french) shop for repair XF

quoted

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!

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I

Has

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

Jeroen

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.

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an 8051

just

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.

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.

interfacing

and

felt

user/designer.

solution.

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.