Manual

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