The U4253BM and U4254BM ICs are
integrated AM/FM antenna matching
circuits in bi-CMOS* technology. They
are intended particularly for car applications
and may be used with windscreen,
roof and bumper antennas.
The U4254BM chip has a lower noise
figure than the U4253BM and a different
AM amplifier stage with two outputs.
Apart from the additional AM output
(pin 11 which is not connected in
the U4253BM), the pinouts of the two
devices are identical.
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