- Published in issue 2/1998 on page 48
AM/FM antenna impedance matching IC
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.