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Look like you got lucky. A 20x price increase sounds like they may have made a mistake.
8 years old revision 0.0 engineering sample chip... I'm not even going to buy them for $10. I can get a brand new latest revision chip from ADI web store for $19.ADI web store sells chips at usually half DigiKey price with no MOQ (you can buy 1 pop at their 100pcs~499pcs price). You need to be patient though, they ship from Singapore.
MLBCLK, MLBDAT, MLBSIG, MLBDO, MLBSO Available on automotive models only. In standard products using silicon revision 0.2and above connect to ground (GND). In standard products using silicon revisionsprevious to revision 0.2, leave these pins floating if unused.
Putting an engineering sample on a board is a complete waste of time and money! There will be many bugs and you'll be chasing your own tail to figure out whether you made an error, the problem is in the soldering process or the chip isn't right.
Make sure to bakeout before reflowing them.