SI4420-D1-FT Datasheet, PDF (9/33 Pages) List of Unclassifed Manufacturers – Si4420 Universal ISM Band FSK Transceiver

Si4420
AC Characteristics (Transmitter)
Symbol
I _OUT
P _max
P _out
P _sp
C_o
Q_o
L _out
BR
df _fsk
Parameter
Open collector output DC current
Available output power with optimal
antenna impedance
(Note 3, 4)
Typical output power
Spurious emission
Output capacitance
(set by the automatic antenna tuning
circuit)
Quality factor of the output
capacitance
Output phase noise
FSK bit rate
FSK frequency deviation
Conditions/Notes
Programmable
In low bands
In high bands
Selectable in 2.5 dB steps (Note 5)
At max power with loop antenna
(Note 6)
In low bands
In high bands
In low bands
In high bands
100 kHz from carrier
1 MHz from carrier
Programmable in 15 kHz steps
Min
Typ
0.5
8
4
P _max -21
2
2.6
2.1
2.7
13
15
8
10
-75
-85
15
Max Units
6
mA
dBm
P _max
-50
3.2
3.3
17
12
dBm
dBc
pF
dBc/Hz
256
kbps
240
kHz
AC Characteristics (Turn-on/Turnaround timings)
Symbol
t _sx
T _{tx_rx_XTAL_ON}
T _{rx_tx_XTAL_ON}
T _{tx_rx_SYNT_ON}
T _{rx_tx_SYNT_ON}
Parameter
Crystal oscillator startup time
Transmitter - Receiver turnover time
Receiver - Transmitter turnover time
Transmitter - Receiver turnover time
Receiver - Transmitter turnover time
Conditions/Notes
Min
Crystal ESR < 100 (Note 8)
Synthesizer off, crystal oscillator on during
TX/RX change with 10 MHz step
Synthesizer off, crystal oscillator on during
RX/TX change with 10 MHz step
Synthesizer and crystal oscillator on
during TX/RX change with 10 MHz step
Synthesizer and crystal oscillator on
during RX/TX change with 10 MHz step
Typ Max
1
5
450
350
425
300
Units
ms
µs
µs
µs
µs
AC Characteristics (Others)
Symbol
C _xl
t _POR
Parameter
Crystal load capacitance,
see crystal selection guide
Internal POR timeout
t _PBt
C _{in, D}
t _{r, f}
Wake-up timer clock accuracy
Digital input capacitance
Digital output rise/fall time
All notes for tables above are on page 10.
Conditions/Notes
Programmable in 0.5 pF steps, tolerance
+/- 10%
After V_dd has reached 90% of final value
(Note 7)
Crystal oscillator must be enabled to
ensure proper calibration at startup
(Note 8)
15 pF pure capacitive load
Min Typ
8.5
Max Units
16
pF
150
ms
+/-10
%
2
pF
10
ns
9