Rainbow Electronics RF12 - Manual

RF12
RF12 Universal ISM Band
FSK Transceiver
RF12
DESCRIPTION
Hope’s RF12 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 315, 433,
868 and 915 MHz bands. The RF12 transceiver 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 RF12 features a completely integrated PLL for easy RF design, and its rapid settling time allows
for fast frequency-hopping, bypassing multi-path 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 RF12 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 RF12 can provide a clock signal for the microcontroller, avoiding
the need for two crystals.
For low power applications, the RF12 supports low duty cycle operation based on the internal
wake-up timer.
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