MRF89XA-I/MQ Microchip Technology, MRF89XA-I/MQ Datasheet - Page 9

• Manufacturer Part Number: MRF89XA-I/MQ
• Description: TXRX ISM SUB-GHZ ULP 32QFN
• Manufacturer: Microchip Technology

Specifications of MRF89XA-I/MQ

• Package / Case: 32-WFQFN Exposed Pad
• Frequency: 863MHz ~ 870MHz, 902MHz ~ 928MHz, 950MHz ~ 960MHz
• Data Rate - Maximum: 200kbps
• Modulation Or Protocol: FSK, OOK
• Applications: ISM
• Power - Output: 12.5dBm
• Sensitivity: -113dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 3mA
• Current - Transmitting: 25mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Number Of Receivers: 1
• Number Of Transmitters: 1
• Wireless Frequency: 863 MHz to 870 MHz, 902 MHz to 928 MHz, 950 MHz to 960 MHz
• Interface Type: SPI
• Noise Figure: - 112 dBc
• Output Power: - 8.5 dBm, + 12.5 dBm
• Operating Supply Voltage: 2.1 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Data Rate: 256 Kbps
• Maximum Supply Current: 25 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2.0
The MRF89XA is an integrated, single chip, low-power
ISM band sub-GHz transceiver. A simplified architec-
tural block diagram of the MRF89XA is shown in
Figure 2-1. The frequency synthesizer is clocked by an
external 12.8 crystal, and frequency ranges from
863-870 MHz, 902-928 MHz and 950-960 MHz.
The MRF89XA receiver employs a super-heterodyne
architecture. Here, the first IF is 1/9th of the RF
frequency (approximately 100 MHz). The second down
conversion down converts the I and Q signals to base-
band in the case of the FSK receiver (Zero IF) and to a
low-IF (IF2) for the OOK receiver. After the second
down-conversion stage, the received signal is channel
select filtered and amplified to a level adequate for
demodulation. Both FSK and OOK demodulation are
available. Image rejection is achieved by the SAW filter.
The baseband I and Q signals at the transmitter side are
digitally generated by a DDS whose Digital-to-Analog
Converters (DAC) followed by two anti-aliasing low-pass
filters transform the digital signal into analog In-Phase (I)
and Quadrature (Q) components whose frequency is the
selected Frequency Deviation (Fdev). The transmitter
supports both FSK and OOK modes of operation. The
transmitter has a typical output power of +12.5 dBm. An
 2010 Microchip Technology Inc.
HARDWARE DESCRIPTION
Advance Information
internal transmit/receive switch combines the transmitter
and receiver circuits into a single-ended RFIO pin. This
pin is connected to the impedance matching circuitry
(Balun) and to the external antenna with power amplifier
pin, if required. The device operates in the low-voltage
range of 2.1V to 3.6V, and in Sleep mode, it operates at
a very low-current state, typically 0.1 µA.
The quality of the data is validated using the RSSI and
bit synchronizer blocks built into the transceiver. Data
is buffered in 64-byte transmitter registers and receiver
FIFOs. The frequency synthesizer allows the use of a
low-accuracy, low-cost crystal. CLKOUT can be used
to clock the external controller. The transceiver is con-
trolled via a 4-wire Serial Peripheral Interface (SPI),
interrupt (IRO0 and IRO1), PLOCK, DATA and Chip
Select pins for SPI.
The MRF89XA supports the following feature blocks:
• Data Filtering and Whitening
• Bit Synchronization
• 64-Byte Transmit and Receive FIFO Buffer
• General Configuration Registers
These features reduce the processing load, which
allows the use of simple, low-cost 8-bit microcontrollers
for data processing.
MRF89XA
DS70622A-page 9