HopeRF\'\'s RFM01 is a low power, multi-channel FSK receiver module designed for use in applications requiring FCC or ETSI conformance for unlicensed use in the bands at 315, 433, 868 and 915 MHz. Used in conjunction with RFM02, HopeRF\'\'s FSK transmitter, the RFM01 is a flexible, low cost and highly integrated solution that does not require production alignments. The RFM01 has a completely integrated PLL for easy RF design, and its rapid settling time allows for fast frequency-hopping, bypassing multipath fading and interference to achieve robust wireless links. The PLL\'\'s high resolution allows the usage of multiple channels in any of the bands. The base-band bandwidth (BW) is programmable to accommodate various deviation, data rate and crystal tolerance requirements. The receiver employs the Zero-IF approach with I/Q demodulation, this way no external components (except crystal and decoupling) are needed in a typical application. The RFM01 is a complete analog RF and base-band receiver including a multi-band PLL synthesizer with an LNA, I/Q down converter mixers, base-band filters and amplifiers, I/Q demodulator. The system dramatically reduces the load on the microcontroller with the integrated digital data processing: data filtering, clock recovery, data pattern recognition and integrated FIFO. The automatic frequency control (AFC) feature allows using a low accuracy (low cost) crystal. To minimize the system cost, the chip can provide a clock signal for the microcontroller, avoiding the need for two crystals. Features: 1) No alignment required in production with optimized antenna design, guaranteed reception performance 2) Fast-settling, programmable, high-resolution PLL synthesizer 3) Fast frequency-hopping capability 4) High bit rate (up to 115.2Kbps in digital mode) 5) Programmable base-band bandwidth (67 to 400kHz) 6) Digital RSSI outputs 7) Automatic frequency control (AFC) 8) Data quality detection (DQD) 9) Internal data filtering and clock recovery 10) RX pattern recognition 11) SPI compatible serial control interface 12) Clock and reset signals for micro controller 13) 16 bits RX Data FIFO 14) Low power duty cycle mode (less than 0.5mA average supply current) 15) Standard 10MHz crystal reference 16) Alternative OOK support 17) Wake-up timer 18) Low battery detector 19) 2.2 to 5.4V supply voltage 20) Low power consumption (~9mA in low bands) 21) Low standby current (0.3mA) 22) Typical applications a) Remote control b) Intelligent wireless network c) Home security and alarm d) Wireless keyboard/mouse and other PC peripherals e) Toy controls f) Remote keyless entry g) Tire pressure monitoring h) Telemetry i) Personal / patient data logging j) Remote automatic meter reading