SI4420-D1-FT Datasheet, PDF (8/33 Pages) List of Unclassifed Manufacturers – Si4420 Universal ISM Band FSK Transceiver

Si4420
AC Characteristics (PLL parameters)
Symbol
f _ref
Parameter
PLL reference frequency
f_o
Receiver LO/Transmitter
carrier frequency
t _lock
PLL lock time
t _{st, P}
PLL startup time
AC Characteristics (Receiver)
Conditions/Notes
(Note 1)
315 MHz band, 2.5 kHz resolution
433 MHz band, 2.5 kHz resolution
868 MHz band, 5.0 kHz resolution
915 MHz band, 7.5 kHz resolution
Frequency error < 1kHz
after 10 MHz step
With a running crystal oscillator
Min
8
310.24
430.24
860.48
900.72
Typ
10
20
Max
12
319.75
439.75
879.51
929.27
Units
MHz
MHz
µs
250
µs
Symbol Parameter
BW
Receiver bandwidth
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
All notes for tables above are on page 10.
Conditions/Notes
mode 0
mode 1
mode 2
mode 3
mode 4
mode 5
With internal digital filters
With analog filter
BER 10^-3, BW=67 kHz, BR=1.2 kbps (Note 2)
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
Min
60
120
180
240
300
360
0.6
0
1
Typ
67
134
200
270
350
400
-109
0.8*df _FSK
-21
Max
75
150
225
300
375
450
115.2
256
-100
Units
kHz
kbps
kbps
dBm
dBm
-18
dBm
-15
dBm
-12
dBm
dBm
1
pF
+/-5
dB
46
dB
nF
6
dB
500
µs
8