The BK4818 is a half-duplex TDD FM transceiver.


The BK4818 is a half duplex TDD FM transceiver operating from 115 MHz to 537 MHz band for worldwide personal radio. Besides speech communication, the BK4815N on-chip FSK data modem supports F2D and F1W emission to be used in FRS band for text message and GPS information exchange.

The BK4818 is a complete, small form factor solution optimized for low-power, low-cost, and highly integrated mobile and portable consumer electronic devices, requiring only a few external decoupling capacitors and an external inductor for input matching.


- World wide band: 115 ~ 537 MHz

- 12.5/25 kHz channel spacing

- On chip 5 dBm RF PA

- 3.0 V to 3.6 V power supply

- CTCSS tone receiver with up to parallel eight frequency detector

- 23/24 bit programmable DCS code

- Standard DTMF and programmable in-band dual tone

- SELCALL and programmable in-band single tone

- 1.2/2.4 kbps FSK data modem with either F2D or F1W modulation type

- Frequency inversion scrambler

- Voice activated switch (VOX) and time-out timer

- RF Signal strength measurement and signal quality measurement

- TX Audio signal strength indication and RX audio signal strength indication

- 3-wires interface with MCU with maximum 8 Mbps clock rate

- QFN 4x4 32-Pin package


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