The BA4424N is a monolithic IC designed for FM front end use. It consists of an RF amplifier circuit, mixer circuit, local oscillation circuit, IF buffer amplifier, and a variable capacitor-diode for AFC.

FEATUREs
1) An RF amplifier, mixer, local oscillator, IF buffer amplifier, and AFC diode are included on-chip.
2) Reception of VHF terrestrial TV channels is possible.
3) Uses a double balance mixer to improve intermodulation characteristics.
4) Includes a clamp diode in the mixer output.
5) Local oscillation buffer on-chip for improved response to strong input.
6) The output impedance of the IF buffer amplifier is matched with the ceramic filter impedance at 330Ω.
7) A resistive load can also be used for the mixer output.
8) Mixer input coupling capacitor included on-chip.
9) Includes a feedback capacitor for the local oscillation circuit.
10) Compact 9-pin SIP package. Pins arranged for convenient mounting.