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What is this IC in the WorldSpace Satellite Radio Receiver?

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air2008

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hi,

There is an IC in the WorldSpace Satellite Reiver. It has 5 PINs and it connection is shown in the attached file. I have measured its input and output relationship.
Vin(V)/V1(V)
0.9 / 0.1
1.2 / 0.1
1.5 / 0.1
1.8 / 0.1
2.1 / 0.1
2.4 / 0.1
2.5 / 0.1
2.6 / 2.5
2.7 / 2.6
2.8 / 2.7
3.1 / 3.0
3.4 / 3.3
4.5 / 4.4
There are 4 letters on this IC:"263F". What is this IC?


air2008
 

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