Datasheet

MRF49XA
DS70590C-page 82 Preliminary © 2009-2011 Microchip Technology Inc.
Note 1: Typical Values: TA = 25°C, VDD = 3.3V.
TABLE 5-6: PLL PARAMETERS AC CHARACTERISTICS
(1)
Note 1: Typical Values: TA = 25°C, VDD = 3.3V.
TABLE 5-5: TRANSMITTER AC CHARACTERISTICS
(1)
Parameters Condition Min Typ Max Unit
RF Carrier Frequency 433 MHz band, 2.5 kHz resolution 430.24 439.75 MHz
868 MHz band, 5.0 kHz resolution 860.48 879.51 MHz
915 MHz band, 7.5 kHz resolution 900.72 929.27 MHz
Maximum RF Output Power 433 MHz @ 50Ω load 7 dBm
868 MHz @ 50Ω load 5 dBm
915 MHz @ 50Ω load 5 dBm
RF Output Power Control Range In steps of 8 P
max – 17.5 Pmax dBm
TX Gain Control Resolution Programmed in 8 steps 2.5 dB
Harmonic Suppression At maximum power, 50Ω load -35 dBc
Open-Collector Output DC
Current
Programmable 0.5 6 mA
Spurious Emission
| f-f
sp | > 1 MHz
At maximum power, 50Ω load -55 dBc
Output Capacitance (Set by the
Automatic Antenna Tuning
Circuit)
433 MHz band 2 2.6 3.2 pF
868 MHz band 2.1 2.7 3.3 pF
915 MHz band 2.1 2.7 3.3 pF
Quality Factor of the Output
Capacitance
433 MHz band 13 15 17
868 MHz band 8 10 12
915 MHz band 8 10 12
Output Phase Noise 100 kHz from carrier -80 dBc/Hz
1 MHz from carrier -103 dBc/Hz
FSK Bit Rate Internal TX Data register 172 kbps
FSK Bit Rate TX data connected to the FSK
input
256 kbps
FSK Frequency Deviation Programmable in 15 kHz steps 15 240 kHz
Parameters Condition/Note Min Typ Max Unit
PLL Reference Frequency Crystal related timing and fre-
quency parameters change
according to the PLL reference
frequency
91011MHz
PLL Lock Time Frequency error <1 kHz after
10 MHz step
—30μs
PLL Start-up Time With a running crystal oscillator
and based on the design
200 300 μs