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Si4420
AC Characteristics (PLL parameters)
Symbol
f ref
Parameter
PLL reference frequency
Conditions/Notes
(Note 1)
Min
8
Typ
10
Max
12
Units
MHz
315 MHz band, 2.5 kHz resolution
310.24
319.75
f o
Receiver LO/Transmitter
carrier frequency
433 MHz band, 2.5 kHz resolution
868 MHz band, 5.0 kHz resolution
430.24
860.48
439.75
879.51
MHz
915 MHz band, 7.5 kHz resolution
900.72
929.27
t lock
t st, P
PLL lock time
PLL startup time
Frequency error < 1kHz
after 10 MHz step
With a running crystal oscillator
20
250
μs
μs
AC Characteristics (Receiver)
Symbol
Parameter
Conditions/Notes
Min
Typ
Max
Units
mode 0
mode 1
60
120
67
134
75
150
BW
Receiver bandwidth
mode 2
180
200
225
kHz
mode 3
mode 4
mode 5
240
300
360
270
350
400
300
375
450
BER 10 , BW=67 kHz, BR=1.2 kbps (Note 2)
BR
BRA
P min
AFC range
IIP3 inh
IIP3 outh
IIP3 inl
IIP3 outl
P max
Cin
RS a
RS r
C ARSSI
RS step
RS resp
FSK bit rate
FSK bit rate
Receiver Sensitivity
AFC locking range
Input IP3
Input IP3
IIP3 (LNA –6 dB gain)
IIP3 (LNA –6 dB gain)
Maximum input power
RF input capacitance
RSSI accuracy
RSSI range
Filter capacitor for ARSSI
RSSI programmable level
steps
DRSSI response time
With internal digital filters
With analog filter
-3
df FSK : FSK deviation in the received signal
In band interferers in high bands (868, 915 MHz)
Out of band interferers
l f-f o l > 4 MHz
In band interferers in low bands (315, 433 MHz)
Out of band interferers
l f-f o l > 4 MHz
LNA: high gain
Until the RSSI signal goes high after the input signal
exceeds the preprogrammed limit C ARRSI = 5 nF
0.6
0
1
-109
0.8*df FSK
-21
-18
-15
-12
1
+/-5
46
6
500
115.2
256
-100
kbps
kbps
dBm
dBm
dBm
dBm
dBm
dBm
pF
dB
dB
nF
dB
μs
All notes for tables above are on page 10.
8
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