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
 
t
sp
 
PLL startup time
After turning on from idle mode, with
crystal oscillator already stable
 
 
250
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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