BK2421 Low Power High Performance 2.
4 GHz GFSK Transceiver Features Pin Assignments  2400-2483.
5 MHz ISM band operation  Support 1 and 2 Mbps air data rate  Programmable output power (-40dBm to 5dBm)  Low power consumption  Tolerate +/- 60ppm 16 MHz crystal  Variable payload length from 1 to 32bytes  Automatic packet processing  6 data pipes for 1:6 star networks  1.
9V to 3.
6V power supply  4-pin SPI interface with maximum 8 MHz clock rate  Compact 20-pin 4x4 mm QFN package Applications  Wireless PC peripherals  Wireless mice and keyboards  Wireless gamepads  Wireless audio  VOIP and wireless headsets Block Diagram VSS CDVDD VDD 20 19 18 VSS IREF 17 16 CE 1 CSN 2 SCK 3...

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