The SiW1721B is a 2.4-GHz radio transceiver for Bluetooth wireless technology. This highly integrated transceiver is specifically designed for use with a third party Bluetooth baseband controller chipset requiring an external Bluetooth RF transceiver. Due to its low power CMOS process, the design minimizes current draw in both active and standby modes. The SiW1721B combines a radio transceiver and Gaussian Frequency Shift Keying (GFSK) modem with digital control and interface logic. The IC also incorporates analog and digital voltage regulators and a reference Phase Lock Loop (PLL) capable of accepting various reference clock frequencies. The level of integration enables a low system cost with fewer external components.