MRF89XA-I/MQ Microchip Technology, MRF89XA-I/MQ Datasheet - Page 100

• 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

4.4
The Power Amplifier (PA) integrated in the MRF89XA
operates under a regulated voltage supply of 1.8V. The
external RF choke inductor is biased by an internal reg-
ulator output made available on the PARS pin (pin 29).
These features help PA output power to be consistent
over the power supply range. This is important for
applications that allow predictable RF performance and
battery life.
FIGURE 4-4:
DS70622B-page 100
MRF89XA
Note:
POWER AMPLIFIER
Refer to Section 4.7 “Bill of Materials”
for an optimized PA load setting.
OPTIMAL LOAD IMPEDANCE CHART
Preliminary
4.4.1
As the PA and the LNA front-ends in the MRF89XA
share the same input/output pin, they are internally
matched to approximately 50Ω. Figure 4-4illustrates
optimum load impedance of RFIO through an imped-
ance chart.
Max Power
Zopt = 30 + j25Ω
OPTIMUM LOAD IMPEDANCE
Pmax-1dB circle
© 2010 Microchip Technology Inc.