Si4020
8
AC Characteristics
Symbol
Parameter
Conditions/Notes
Min
Typ
Max
Units
f
ref
PLL reference frequency
Crystal operation mode is parallel (Note 2)
8
10
12
MHz
315 MHz band, 2.5 kHz resolution
310.24
319.75
433 MHz band, 2.5 kHz resolution
430.24
439.75
868 MHz band, 5.0 kHz resolution
860.48
879.51
f
o
Output frequency (programmable)
915 MHz band, 7.5 kHz resolution
900.72
929.27
MHz
t
lock
PLL lock time
Frequency error < 10 kHz after 10 MHz
step
20
祍
t
sp
PLL startup time
After turning on from idle mode, with
crystal oscillator already stable
250
祍
I
OUT
Open collector output current (Note 3) At all bands
0.1
2.5
mA
P
maxL
Available output power
(315 and 433 MHz band)
With optimal antenna impedance
(Note 4)
3
dBm
P
maxH
Available output power
(868 and 915 MHz band)
With optimal antenna impedance
(Note 4)
1
dBm
P
out
Typical output power
Selectable in 3 dB steps (Note3)
P
max
-21
P
max
dBm
P
sp
Spurious emission
At max power with loop antenna
(Note 5)
-50
dBc
At low bands
1.5
2.3
3.1
C
o
Output capacitance (set by the
automatic antenna tuning circuit)
At high bands
1.6
2.2
2.8
pF
Q
o
Quality factor of the output
capacitance
16
18
22
100 kHz from carrier
-75
L
out
Output phase noise
1 MHz from carrier
-85
dBc/Hz
BR
FSK
FSK bit rate
256
kbps
BR
OOK
OOK bit rate
512
kbps
df
fsk
FSK frequency deviation
Programmable in 30 kHz steps
30
240
kHz
C
xl
Crystal load capacitance
See Crystal Selection Guidelines
Programmable in 0.5 pF steps, tolerance
+/- 10%
8.5
16
pF
t
POR
Internal POR timeout
(Note 6)
After V
dd
has reached 90% of final value
100
ms
t
sx
Crystal oscillator startup time
Crystal ESR < 100 Ohms (Note 7)
1
5
ms
t
PBt
Wake-up timer clock accuracy
Crystal oscillator must be enabled to
ensure proper calibration at startup
(Note 7)
+/-10%
ms
t
wake-up
Programmable wake-up time
1
2 ?/SPAN> 10
9
ms
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 table above are on page 7.
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