Ac characteristic, Ac characteristic(transmitter), Rfm12 – Rainbow Electronics RFM12 User Manual
Page 4
RFM12
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AC characteristic
symbol parameter
remark
min
typical max Unit
f
ref
PLL frequency
8
10
12
MHz
f
LO
frequency
(10MHz crystal
used)
315 MHz band,2.5KHz step
433 MHz band,2.5KHz step
868 MHz band,5KHz step
915 MHz band,7.5KHz step
310.24
430.24
860.48
900.72
319.75
439.75
879.51
929.27
MHz
f
LO
frequency
(8MHZ crystal
used)
315 MHz band,2.5KHz step
433 MHz band,2.5KHz step
868 MHz band,5KHz step
915 MHz band,7.5KHz step
248.19
344.19
688.38
720.57
255.80
351.80
703.61
743.41
MHz
f
LO
frequency
(12MHZ crystal
used)
315 MHz band,2.5KHz step
433 MHz band,2.5KHz step
868 MHz band,5KHz step
915 MHz band,7.5KHz step
372.28
516.28
1032.5
1080.8
383.71
527.71
1055.4
1115.1
MHz
BW Receiver
bandwidth
1
2
3
4
5
6
60
120
180
240
300
360
67
134
200
270
350
400
75
150
225
300
375
450
KHz
t
lock
PLL lock time
After 10MHz step hopping,
frequency error <10 kHz
20
us
BR Data
rate
With internal digital
demodulator
0.6
115.2
kbps
BR
A
Data rate
With external RC filter
256
kbps
P
min
sensitivity BW=134KHz,BR=1.2kbps
-102 -96 dBm
AFC
range
AFC working range
df
FSK
FSK deviation in the
received signal
0.8*
df
FSK
RS
A
RSSI accuracy
±5
dB
RS
R
RSSI range
46
dB
C
ARSSI
ARSSI filter
1
nF
RS
STEP
RSSI
programmable step
6
dB
RS
RESP
DRSSI response
time
RSSI output high after
valid , CARRSI=5nF
500
us
AC characteristic(Transmitter)
symbol parameter
remark
min
typical max Unit
P
max
Available output power with
optimal antenna impedance
315/433MHZ band
868/915MHZ band
8
0
dbm
P
out
Typical output power
Selectable in 3 dB
steps
P
max
-21
P
max
dbm