Rainbow Electronics RF12 - Manual (Page 11)

RF12
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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 Characteristics (Turn-on/Turnaround timings)
Symbol Parameter Conditions/Notes Min Typ Max Units
t
sx
Crystal oscillator
startup time
Crystal ESR < 100 5 ms
T
tx_rx_XTAL_ON
Transmitter -
Receiver turnover
time
Synthesizer off, crystal oscillator on
during TX/RX change with 10 MHz
step
450 us
T
rx_tx_XTAL_ON
Receiver
-Transmitter
turnover time
Synthesizer off, crystal oscillator on
during RX/TX change with 10 MHz
step
350 us
T
tx_rx_SYNT_ON
Transmitter -
Receiver turnover
time
Synthesizer and crystal oscillator on
during TX/RX change with 10 MHz
step
425 us
T
rx_tx_SYNT_ON
Receiver
-Transmitter
turnover time
Synthesizer and crystal oscillator on
during RX/TX change with 10 MHz
step
300 us
AC Characteristics (Others)
Symbol Parameter Conditions/Notes Min Typ Max Units
C
xl
Crystal load capacitance, see
crystal selection guide
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 (Note 7)
100 ms
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.