ISM-band RF transmitter IC (no RX capability). Bare bones with minimal modulation etc support.
Package
8-pin DFN.
Markings:
NR3 XF 138
Die
Size is approximately 
x μm ( mm2)
Mask rev markings (focus stack of several images). Looks like 6 metal layers total.
Random logic showing classic UMC 180nm CMP fill pattern
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