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On Sun, 29 Feb 2004 15:06:12 -0800, John Miles
wrote: In article , says... "Carl R. Stevenson" wrote in message ... The packaging is not "impossible" - it just takes some different techniques to do the soldering - read the QEX article on a DDS/PLL synthesiser in the latest issue of QEX I'm pretty comfortable with SOP's and can get along with a TSSOP's, although I can't say I like it. In that article, he used TQFP's which, although I haven't yet had the need, I suspect I can deal with. I use the same technique for TSSOP's that he describes in the article. Actually, the 16-pin PLL chips are TSSOPs, while the AD9852/AD9854 packages I used are considered "LQFP" packages. These are a little thicker than TQFP but are otherwise pretty similar. The DDSes have the same spacing between pins as the TSSOPs (0.5 mm) but more of 'em (80). But when I tried to order samples of 9854's the other day, the only choice was BGA's. I have no clue how to deal with them. Yeah, solder paste and an oven MAYBE, but without machine placement seems like a crap shoot. That's not good news. BGAs really *are* the end of the world for homebrewing as far as I'm aware. I have not heard of any techniques for soldering them by hand. I've done a fair number by hand @ work. They self center nicely, and don't really require any solder other than the balls. Just some fresh liquid flux and a heat gun, and a little practice. They do self center nicely. You can also reflow in a toaster oven if you really want to. (Not the one in the kitchen, please!). Dave |
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