The Beken BK4818 is a highly integrated, low-power half-duplex TDD FM transceiver chip designed for worldwide personal radio applications. It covers the 115 MHz to 537 MHz band (or 128-590 MHz in some documentation) and is ideal for portable devices like walkie-talkies. Key features include an on-chip 5 dBm RF power amplifier, 12.5/25 kHz channel spacing, CTCSS tone receiver, and 23/24-bit programmable DCS codes. The chip operates on a 3.0 V to 3.6 V supply, supports DTMF and in-band dual-tone, and requires only a few external components. It offers an integrated solution for analog two-way communication devices.
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