RFM12B Universal ISM Band FSK Transceiver DESCRIPTION Hoperf’ RFM12B is a single chip, low power, multi-channel FSK transceiver designed for use in applications requiring FCC or ETSI conformance for unlicensed use in the 433, 868 and 915 MHz bands

The RFM12B transceiver is a part of Hoperf’ EZRadio TM product line, which produces a flexible, low cost, and highly integrated solution that does not require production alignments

The chip is a complete analog RF and baseband transceiver including a multi-band PLL synthesizer with PA, LNA, I/Q down converter mixers, baseband filters and amplifiers, and an I/Q demodulator

All required RF functions are integrated

Only an external crystal and bypass filtering are needed for operation

The RFM12B features 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 receiver baseband bandwidth (BW) is programmable to accommodate various deviation, data rate and crystal tolerance requirements

The transceiver employs the Zero-IF approach with I/Q demodulation

Consequently, no external components (except crystal and decoupling) are needed in most applications

The RFM12B dramatically reduces the load on the microcontroller with the integrated digital data processing features: data filtering, clock recovery, data pattern recognition, integrated FIFO and TX data register

The automatic frequency control (AFC) feature allows the use of a low accuracy (low cost) crystal

To minimize the system cost, the RFM12B can provide a clock signal for the microcontroller, avoiding the need for two crystals

For low power applications, the RFM12B supports low duty cycle operation based on the internal wake-up timer

FEATURES • Fully integrated (low BOM, easy design-in) • No alignment required in production • Fast-settling, pro