FM-AM tuner circuit (UTC TA7640AP)

Shown is a single-chip FIvVAM radio circuit TA7640AP. The AM radio frequency signal is input from the ① pin.
High-frequency The mixed output signal is output from the @ pin. Through the middle transformer, the intermediate frequency signal is Send ~IJ@ pin and the AM intermediate frequency amplification circuit in the @ pin
, and then after detection and amplification, the @ pin outputs the audio signal. The FM intermediate frequency signal sent
    from the FM front-end circuit is sent to the @ pin of the IC through the intermediate frequency filter CF1. The FM intermediate frequency is amplified and frequency-identified in the IC, and
the audio signal is demodulated. After being switched, it is also output from the ③ pin.