RF12 Universal ISM Band FSK Transceiver

C o
Q o
L out
RF12
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
Quality factor of the output In low bands
13 15 17
capacitance
In high bands
8 10 12
Output phase noise
100 kHz from carrier 1
-75
MHz from carrier
-85
dBc/Hz
BR FSK bit rate 256 kbps
df fsk
Programmable in 15 kHz
FSK frequency deviation
15 240 kHz
steps
AC Characteristics (Turn-on/Turnaround timings)
Symbol Parameter Conditions/Notes Min Typ Max Units
Crystal oscillator
t sx
Crystal ESR < 100 5 ms
startup time
Transmitter -
T tx_rx_XTAL_ON Receiver turnover
time
Receiver
T rx_tx_XTAL_ON -Transmitter
turnover time
Transmitter -
T tx_rx_SYNT_ON Receiver turnover
time
T rx_tx_SYNT_ON
Receiver
-Transmitter
turnover time
Synthesizer off, crystal oscillator on
during TX/RX change with 10 MHz
step
Synthesizer off, crystal oscillator on
during RX/TX change with 10 MHz
step
Synthesizer and crystal oscillator on
during TX/RX change with 10 MHz
step
Synthesizer and crystal oscillator on
during RX/TX change with 10 MHz
step
450 us
350 us
425 us
300 us
AC Characteristics (Others)
Symbol Parameter Conditions/Notes Min Typ Max Units
C xl
t POR
Crystal load capacitance, see Programmable in 0.5 pF steps,
8.5 16 pF
crystal selection guide
tolerance +/- 10%
After V dd has reached 90% of
Internal POR timeout
100 ms
final value (Note 7)
t PBt Wake-up timer clock period Calibrated every 30 seconds 0.95 1.05 ms
C in, D Digital input capacitance 2 pF
t r , f Digital output rise/fall time 15 pF pure capacitive load 10 ns
Note 1: Not using a 10 MHz crystal is allowed but not recommended because all crystal referred timing
and frequency parameters will change accordingly.
Note 2: See the BER diagrams in the measurement results section for detailed information (Not available
at this time).
Note 3: See matching circuit parameters and antenna design guide for information.
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