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Si4420
AC Characteristics (Transmitter)
Symbol
I OUT
P max
Parameter
Open collector output DC current
Available output power with optimal
antenna impedance
Conditions/Notes
Programmable
In low bands
Min
0.5
Typ
8
Max
6
Units
mA
dBm
(Note 3, 4)
In high bands
4
P out
P sp
Typical output power
Spurious emission
Selectable in 2.5 dB steps (Note 5)
At max power with loop antenna
(Note 6)
P max -21
P max
-50
dBm
dBc
C o
Q o
L out
Output capacitance
(set by the automatic antenna tuning
circuit)
Quality factor of the output
capacitance
Output phase noise
In low bands
In high bands
In low bands
In high bands
100 kHz from carrier
1 MHz from carrier
2
2.1
13
8
2.6
2.7
15
10
-75
-85
3.2
3.3
17
12
pF
dBc/Hz
BR
FSK bit rate
256
kbps
df fsk
FSK frequency deviation
Programmable in 15 kHz steps
15
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
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
Min
Typ
1
450
350
425
300
Max
5
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
Conditions/Notes
Programmable in 0.5 pF steps, tolerance
+/- 10%
After V dd has reached 90% of final value
(Note 7)
Min
8.5
Typ
Max
16
150
Units
pF
ms
Crystal oscillator must be enabled to
t PBt
Wake-up timer clock accuracy
ensure proper calibration at startup
+/-10
%
(Note 8)
C in, D
Digital input capacitance
2
pF
t r, f
Digital output rise/fall time
15 pF pure capacitive load
10
ns
All notes for tables above are on page 10.
9
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