RFM12B Datasheet, PDF (5/11 Pages) List of Unclassifed Manufacturers – UNIVERSAL ISM BAND FSK TRANSCEIVER MODULE

AC characteristic(Transmitter)
symbol parameter
remark
433MHz band
P_max
Max. available output power
868MHz band
915MHz band
P_out
Typical output power
Selectable in 3 dB
steps
C_o
Output capacitance
In low bands
(set by the automatic antenna In high bands
tuning circuit)
Q_o
Quality factor of the output
In low bands
capacitance
In high bands
L_out
Output phase noise
100 kHz from carrier
1 MHz from carrier
BR_TX
FSK bit rate
Via internal TX data
register
BRA_TX FSK bit rate
TX data connected to the
FSK input
df_fsk
FSK frequency deviation
Programmable in 15
kHz steps
RFM12B
Datasheet REV2.0
min
3
2
2
P_max-21
typical
5
4
4
max
P_max
Unit
dBm
dbm
2
2.6
3.2 pf
2.1
2.7
3.3
13
15
17
8
10
12
-80 dbc/HZ
-103
172 kbps
256 kbps
15
240 kHZ
AC characteristic(Turn-on/Turnaround timings)
symbol
parameter
remark
min typical max Unit
T_st
Crystal oscillator
Crystal ESR < 100
startup time
1
5
ms
T_{tx_XTAL_ON}
Transmitter
time
turn-on Synthesizer off, crystal
oscillator on with 10 MHz step
250
us
T_{rx_XTAL_ON}
Receiver turn-on time
Synthesizer off, crystal
oscillator on with 10 MHz step
250
us
Transmitter
– Synthesizer and crystal
T_{tx_rx_SYNT_ON}
Receiver turnover time
oscillator on during TX/RX
change with 10 MHz step
150
us
Receiver
– Synthesizer and crystal
T_{rx_tx_SYNT_ON}
Transmitter turnover
time
oscillator on during RX/TX
change with 10 MHz step
150
us
C_xl
Crystal load
capacitance
Programmable in 0.5 pF steps, 8.5
tolerance+/- 10%
16 pf
t_POR
Internal POR timeout After V_dd has reached 90% of
final value
100 ms
t_PBt
Wake-up timer clock
Calibrated every 30 seconds 0.96
1.05 ms
period
C_{in, D}
Digital input apacitance
2
pf
t_{r, f}
Digital output rise/fall time
15pF pure capacitive load
10 ns
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