Si4020
AC Characteristics
Symbol
Parameter
Conditions/Notes
Min
8
Typ
Max
12
Units
fref
PLL reference frequency
Crystal operation mode is parallel (Note 2)
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
10
MHz
310.24
430.24
860.48
900.72
319.75
439.75
879.51
929.27
fo
Output frequency (programmable)
MHz
µs
Frequency error < 10 kHz after 10 MHz
step
tlock
PLL lock time
20
After turning on from idle mode, with
crystal oscillator already stable
tsp
PLL startup time
250
2.5
µs
IOUT
Open collector output current (Note 3) At all bands
0.1
mA
Available output power
(315 and 433 MHz band)
With optimal antenna impedance
(Note 4)
PmaxL
3
1
dBm
Available output power
(868 and 915 MHz band)
With optimal antenna impedance
(Note 4)
PmaxH
Pout
dBm
dBm
dBc
Typical output power
Selectable in 3 dB steps (Note3)
Pmax-21
Pmax
-50
At max power with loop antenna
(Note 5)
Psp
Spurious emission
At low bands
At high bands
1.5
1.6
2.3
2.2
3.1
2.8
Output capacitance (set by the
automatic antenna tuning circuit)
Co
pF
Quality factor of the output
capacitance
Qo
16
18
22
100 kHz from carrier
1 MHz from carrier
-75
-85
Lout
Output phase noise
dBc/Hz
BRFSK
BROOK
dffsk
FSK bit rate
256
512
240
kbps
kbps
kHz
OOK bit rate
FSK frequency deviation
Programmable in 30 kHz steps
30
Crystal load capacitance
See Crystal Selection Guidelines
Programmable in 0.5 pF steps, tolerance
+/- 10%
Cxl
8.5
16
pF
Internal POR timeout
(Note 6)
tPOR
tsx
After Vdd has reached 90% of final value
Crystal ESR < 100 Ohms (Note 7)
100
5
ms
ms
Crystal oscillator startup time
1
Crystal oscillator must be enabled to
ensure proper calibration at startup
(Note 7)
tPBt
Wake-up timer clock accuracy
+/-10%
ms
twake-up
Cin, D
tr, f
Programmable wake-up time
Digital input capacitance
Digital output rise/fall time
1
2 · 109
2
ms
pF
ns
15 pF pure capacitive load
10
All notes for table above are on page 7.
8
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