RFM02 Datasheet, PDF (7/24 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transmitter

RFM02
Output capacitance
At low bands
Co (set by the automatic At high bands
antenna tuning circuit)
1.5 2.3 2.8
1.6 2.2 3.1
pF
Quality factor of the
Qo
output capacitance
16
18
22
pF
Lout Output phase noise
100 kHz from carrier
1 MHz from carrier (Note 7)
-85
-105
dBc/Hz
BRFSK FSK bit rate
(Note 7)
115.2 kbps
FSK frequency
dffsk
deviation
30
Programmable in 30 kHz steps
210
kHz
Crystal load
capacitance See
Cxl
Crystal Selection
Guidelines
Programmable in 0.5 pF steps, 8.5
tolerance +/-10%
16
pF
Internal POR timeout After Vdd has reached 90% of
tPOR
(Note 6)
final value
50
ms
Crystal oscillator
tsx
startup time
Crystal ESR < 100 Ohms
1.5
5
ms
tPBt
twake-up
Wake-up timer clock
period
Programmable
wake-up time
Calibrated every 30 seconds
0.95
1
1.05
ms
5 *10¹¹
ms
Cin, D
Digital input
capacitance
2
pF
Digital output rise/fall
tr, f
15 pF pure capacitive load
time
10
ns
Note 1: Using a CR2032 battery (225 mAh capacity), the expected battery life is greater than 2 years
using a 60-second wake-up period for sending 50 byte packets in length at 19.2 kbps with +6 dBm output
power in the 915 MHz band.
Note 2: Using anything but a 10 MHz crystal is allowed but not recommended because all
crystal-referred timing and frequency parameters will change accordingly.
Note 3: Adjustable in 8 steps.
Note 4: Optimal antenna admittance/impedance for the RFM02:
Yantenna [S]
Zantenna [Ohm]
Lantenna [nH]
434 MHz 1.3E-3 - j6.3E-3
31 + j152
58.00
868 MHz 1.35E-3 - j1.2E-2
9 + j82
15.20
915 MHz 1.45E-3 - j1.3E-2
8.7 + j77
13.60
Note 5: With selective resonant antennas .
Note 6: During this period, no commands are accepted by the chip.
Note 7: The maximum FSK bitrate and the Output phase noise are dependent on the actual setting of the
PLL Setting Command.
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