User Manual

RF12B
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C
ARSSI
Filter capacitor for
ARSSI
1 nF
RS
step
RSSI programmable
level steps
6 dB
RS
resp
DRSSI response
time
Until the RSSI signal goes high after the input signal
exceeds the preprogrammed limit
C
ARRSI
= 4.7 nF
500 us
P
sp_rx
Receiver spurious
emission
-60 dBm
AC Characteristics (Transmitter)
Symbol
Parameter
Conditions/Notes Min Typ Max Units
I
OUT
Open collector output DC current Programmable
0.5 6 mA
In 433 MHz band
7
P
max_50
Max. output power delivered to 50
Ohm load over a suitable matching
network (Note 4)
In 868 / 915 MHz bands
5
dBm
In 433 MHz band with monopole
antenna with matching network (Note 4)
7
P
max_ant
Max. EIRP with suitable selected
PCB antenna. (Note 6, 7)
In 868 / 915 MHz bands (Note 5)
7
dBm
P
out
Typical output power Selectable in 3 dB steps (Note 8)
P
max
-21 P
max
dBm
At max power 50 Ohm load (Note 4)
-55 dBc
P
sp
Spurious emission
l f-f
sp
l > 1 MHz
With PCB antenna (Note 5)
-60 dBc
At max power 50 Ohm load (Note 4)
-35 dBc
P
harm
Harmonic suppression
With PCB antenna (Note 5)
-42 dBc
In 433 MHz band
2 2.6 3.2
C
o
Output capacitance (set by the
automatic antenna tuning circuit)
In 868 / 915 MHz bands
2.1 2.7 3.3
pF
In 433 MHz band
13 15 17
Q
o
Quality factor of the output
capacitance
In 868 / 915 MHz bands
8 10 12
100 kHz from carrier, in 868 MHz band
-80
L
out
Output phase noise
1 MHz from carrier, in 868 MHz band
-103
dBc/Hz
BR
TX
FSK bit rate Via internal TX data register
172 kbps
BRA
TX
FSK bit rate TX data connected to the FSK input
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 MaxUnits
t
sx
Crystal oscillator startup time
Crystal ESR < 100 Ohm
1 5 ms
T
tx_XTAL_ON
Transmitter turn-on time
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
T
tx_rx_SYNT_ON
Transmitter – Receiver turnover time
Synthesizer and crystal oscillator on
during TX/RX change with 10 MHz step
150 us
T
rx_tx_SYNT_ON
Receiver – Transmitter turnover time
Synthesizer and crystal oscillator on
during RX/TX change with 10 MHz step
150 us