SI4420 Datasheet, PDF (9/33 Pages) Silicon Laboratories – No alignment required in production

Si4420
AC Characteristics (Transmitter)
Symbol
IOUT
Pmax
Pout
Psp
Co
Qo
Lout
BR
dffsk
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
Pmax-21
2
2.6
2.1
2.7
13
15
8
10
-75
-85
15
Max
6
Pmax
-50
3.2
3.3
17
12
256
240
Units
mA
dBm
dBm
dBc
pF
dBc/Hz
kbps
kHz
AC Characteristics (Turn-on/Turnaround timings)
Symbol
tsx
Ttx_rx_XTAL_ON
Trx_tx_XTAL_ON
Ttx_rx_SYNT_ON
Trx_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
Cxl
tPOR
Parameter
Crystal load capacitance,
see crystal selection guide
Internal POR timeout
tPBt
Cin, D
tr, 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 Vdd 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
8.5
Typ Max Units
16
pF
150
ms
+/-10
%
2
pF
10
ns
9