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