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We have a part to change on a small board which MPN is sadly not visible due to damage, the only visible marking at about the middle of the package is TI 851 and there is a production code below (A2YVF). It is QFN16 or WQFN16, and essentially it does convert a 80MHz frequency or related capacitance to 0-3.0V voltage.
Could you kindly let us know what the MPN is?
If you have a schematic or a block diagram of your system, try to see what the failed part may do.Then use the parts lookup, search for the 851 marking.
From parts lookup;http://www.ti.com/packaging/docs/partlookup.tsp#divline Search byMarking on the part TI part number
Search phrase 851
Yields devices with 851 in part number.
Then look for 16 pin package, QFN. An R designator is a wqfn.
ADS7851; from its product folder, packaging tab.
Package | Pins
RTE | 16
SAR ADC, Dual, 1.5 MSPS, 14 Bit, Simultaneous Sampling
Perhaps this is the device?
Regarding A2YVFLTC(Lot Trace Code) number.
TI’s LTC consists of seven(7) alpha-numeric values. example 12ABCDE
I hope this helps.
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In reply to EdWalker:
thank you for the return
Sadly there is no schematic, otherwise it would be easier.
I know for sure it cannot be this ADC because the board has no communication bus, it only receive a 3.3V power and provide a 0 to 3V output according to the reflected RF signal amplitude.
So i suspect the part is an RF log. amp. detector, the operating frequency of the circuit is 80MHz.
In reply to BIDAULT Hoel:
With the information provided there are no other suggestions we can provide.If or when you may have more details, please reply back to this thread or post again.It's very hard to repair an electronic assembly, that has let the smoke out of an IC, without a schematic.I wish you luck with this endeavor.
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