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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.