RFM12 Datasheet, PDF (5/10 Pages) –

C_o
Output capacitance
In low bands
2
(set by the automatic antenna In high bands
2.1
tuning circuit)
Q_o
Quality factor of the output
In low bands
13
capacitance
In high bands
8
L_out
Output phase noise
100 kHz from carrier
1 MHz from carrier
BR
FSK bit rate
df_fsk
FSK frequency deviation
Programmable in 15 15
kHz steps
RFM12
2.6
3.2 pf
2.7
3.3
15
17
10
12
-75 dbc/HZ
-85
256 kbps
240 kHZ
AC characteristic(Turn-on/Turnaround timings)
symbol
parameter
remark
T_st
Crystal oscillator startup Crystal ESR < 100
time
T_{tx_rx_XTAL_ON} Transmitter - Receiver
turnover time
Synthesizer off, crystal
oscillator on
T_{rx_tx_XTAL_ON} Receiver - Transmitter Synthesizer off, crystal
turnover time
oscillator on
min typical max Unit
5
ms
450
us
350
us
T_{tx_rx_SYNT_ON} Transmitter - Receiver
turnover time
T_{rx_tx_SYNT_ON} Receiver - Transmitter
turnover time
C_xl
Crystal load
capacitance
t_POR
Internal POR timeout
t_PBt
C_{in, D}
t_{r, f}
Wake-up timer clock
period
Digital input apacitance
Digital output rise/fall
time
Synthesizer on, crystal
oscillator on
Synthesizer on, crystal
oscillator on
Programmable in 0.5 pF steps,
tolerance+/- 10%
After V_dd has reached 90% of
final value
Calibrated every 30 seconds
15pF pure capacitive load
425
300
8.5
0.96
us
us
16 pf
100 ms
1.05 ms
2
pf
10 ns
Field testing range
Band
Test condition
315MHz band Receiver bandwidth=67KHz,data rate =1.2kbps,Transmitter frequency
deviation =45KHZ（matches with RFM12）in free open area
433MHz band Receiver bandwidth =67KHz, data rate=1.2kbps, transmitter frequency
deviation =45KHZ（matches with RFM12）In free open area
868MHz band Receiver bandwidth=67KHz,data rate =1.2kbps,Transmitter frequency
deviation =45KHZ（matches with RFM12）in free open area
915MHz band Receiver bandwidth=67KHz,data rate =1.2kbps,Transmitter frequency
deviation =45KHZ（matches with RFM12）in free open area
Distance
>100M
>150M
>100M
>100M
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