Si4021
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
433 MHz band, 2.5 kHz resolution
430.24
439.75
868 MHz band, 5.0 kHz resolution
860.48
879.51
f
o
Transmitter frequency
915 MHz band, 7.5 kHz resolution
900.72
929.27
t
lock
PLL lock time
Frequency error < 10 kHz after 10 MHz
step, POR default PLL setting (Note 7)
20
祍
t
sp
PLL startup time
After turning on from idle mode, with
crystal oscillator already stable, POR
default PLL setting (Note 7)
250
祍
I
OUT
Open collector output current (Note
3)
At all bands
0.5
6
mA
P
maxL
Available output power
(433 MHz band)
With opt. antenna impedance (Note 4)
8
dBm
P
maxH
Available output power
(868 and 915 MHz band)
With opt. antenna impedance (Note 4)
6
dBm
P
out
Typical output power
Selectable in 3 dB steps (Note 3)
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
-85
L
out
Output phase noise
1 MHz from carrier (Note 7)
-105
dBc/Hz
BR
FSK
FSK bit rate
(Note 7)
115.2
kbps
BR
OOK
OOK bit rate
512
kbps
df
fsk
FSK frequency deviation
Programmable in 30 kHz steps
30
210
kHz
Crystal load capacitance
C
xl
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
150
ms
t
sx
Crystal oscillator startup time
Crystal ESR < 100 Ohms (Note 8)
1.5
5
ms
t
PBt
Wake-up timer accuracy
Crystal oscillator must be enabled to
ensure proper calibration at startup
(Note 8)
+/-10
%
t
wake-up
Programmable wake-up time
1
5 ?/SPAN>
10
11
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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