5.8GHz wireless AV link transmitter problem

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jankro

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I have a set of these and the transmitter has a heat sensetive four legged SMD chip inside the metal can. Picture disappears when this warms up and after cooling it, the picture re-appears.
I have not found any info about the chip. If anyone can help, I would appreciate it!
**broken link removed**

-Jan
 

Looking at the way it is used, I would suggest its a Hittite H251 prescaler. It seems to feed the Zarlink PLL (above it) from the oscillator (below it) and the SOT23 device looks to be wired as a charge pump in the PLL feedback path.

Brian.
 
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    jankro

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Great, thank you very much!!

Now, my next problem is where to get one of those beasts. A quick check showed that only some wholesale places have them and I don't think that I need thousand's of them ;-)

-Jan
 

They are probably obsolete, Hittite don't list them on their web site but they probably make a replacement type you could drop in instead. Try contacting them, they have a representative in Finand. The contact information is on their web site Hittite Microwave I find most companies are helpful and often let you have a free sample!

Brian.
 

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