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MRF49XA
1.0 INTRODUCTION
Microchip’s MRF49XA is a fully integrated Sub-GHz
RF transceiver. This low-power single chip Frequency
Shift Keying (FSK) baseband transceiver supports:
? Zero-IF architecture
? Multi-channel and multi-band
? Synthesizer with PLL
? Power Amplifier (PA)
? Low Noise Amplifier (LNA)
? I/Q down converter mixers
? I/Q demodulator
? Baseband filters (BBFs) and amplifiers
The simplified functional block diagram of MRF49XA is
shown in Figure 1-1 . The MRF49XA is an ideal choice
for low-cost, high-volume, low data rate (<256 kbps),
two-way and short range wireless applications. This
transceiver can be used in the unlicensed 433 MHz,
868 MHz and 915 MHz frequency bands, and for
applications looking for FCC, IC or ETSI certification in
the ISM band.
The MRF49XA has a low phase noise and provides an
excellent adjacent channel interference, Bit Error Rate
(BER) and larger communication coverage along with
higher output power. The MRF49XA device’s AFC
feature allows for the use of a low-accuracy, low-cost
crystal. In order to minimize the total system cost, a
communication link in most of the applications can be
created using a low-cost, generic 10 MHz crystal, a
bypass filter and an affordable microcontroller. The
MRF49XA provides a clock signal for the
microcontroller and avoids the need for a second
crystal on the circuit board. The transceiver can be
interfaced with many popular Microchip PIC ?
microcontrollers through a 4-wire SPI, interrupt (IRO)
and Reset. The interface between the microcontroller
and MRF49XA is shown in Figure 1-2 .
The MRF49XA supports the following digital data
processing features:
? PLL and I/Q VCO with Calibration
? Receiver Signal Strength Indicator
? Data Quality Indicator
? AFC
? Baseband Power Amplifier
? TX and RX Buffers
The receiver ’s Baseband Bandwidth (BBBW) can be
programmed to accommodate various deviations, data
rates and crystal tolerance requirements.
The high-resolution PLL allows:
? The usage of multiple channels in any of the
bands
? The rapid settling time allows for faster frequency
hopping, bypassing multipath fading and
interference to achieve robust wireless links
The transceiver is integrated with different Sleep modes
and an internal wake-up timer to reduce the overall
current consumption, and to extend the battery life. The
device’s small size with low-power consumption makes
it ideal for various short range radio applications.
? 2009-2011 Microchip Technology Inc.
Preliminary
DS70590C-page 7
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