The CC1101 is a low-cost sub- 1 GHz transceiver designed for very low-power wireless applications. The circuit is mainly intended for the ISM (Industrial, Scientific and Medical) and SRD (Short Range Device) frequency bands at 315, 433, 868, and 915 MHz, but can easily be programmed for operation at other frequencies in the 300-348 MHz, 387-464 MHz and 779-928 MHz bands. CC1101 is an improved and code compatible version of the CC1100 RF transceiver. The main improvements on the CC1101 include: Improved spurious response Better close-in phase noise improving Adjacent Channel Power (ACP) performance Higher input saturation level Improved output power ramping Extended frequency bands of operation, i.e. CC1100: 400-464 MHz and 800-928 MHz CC1101: 387-464 MHz and 779-928 MHz The RF transceiver is integrated with a highly configurable baseband modem. The modem supports various modulation formats and has a configurable data rate up to 500 kBaud. CC1101 provides extensive hardware support for packet handling, data buffering, burst transmissions, clear channel assessment, link quality indication, and wake-on-radio. The main operating parameters and the 64-byte transmit/receive FIFOs of CC1101 can be controlled via an SPI interface. In a typical system, the CC1101 will be used together with a microcontroller and a few additional passive components.