TDA 4320X

Semiconductor Group

39

04.96

2

Functional Description

The FM-IF demodulator TDA 4320X has been developed especially for car radio

applications. The on-chip multipath identification circuit activates an interference

suppression circuit in case of multipath interferences.

3

Circuit Description

The IC includes a 7-stage capacitive coupled limiter amplifier with coincidence

demodulator and AF output. The AF output signal can be continuously attenuated to

decrease the noise. In case of multipath interferences, the TDA 4320X includes an

identification circuitry. There is a field strength output (with min. 76 dB dynamic range,

typ.

± 1 dB nonlinearity and typ. ± 3 dB temperature drift), an IF counter output and an

adjustable muting (with full muting

≥ 80 dB).