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6
Si4022
Symbol
Parameter
Conditions/Notes
Min
Typ
Max
Units
BR
FSK bit rate
(Note 4)
 
 
115.2
kbps
I
out
 
Open collector output current
Adjustable in 8 steps
0.5
 
6
mA
Pmax
Available output power
With optimal antenna impedance
(Note 5)
 
6
 
dBm
P
out
 
Typical output power
Adjustable in 8 steps
(3 dB/step)
P
max
 - 21
 
P
max
 
dBm
P
sp
 
Spurious emission
Out of band, EIRP (Note 6)
 
 
-52
dBm
C
out
 
Output capacitance
Set by the automatic antenna
tuning circuit
1.6
2.2
2.8
pF
Q
out
 
Quality factor of the output
capacitance
 
16
18
22
 
L
out
 
Output phase noise
100 kHz from carrier
1 MHz from carrier (Note 4)
 
-85
-105
 
dBc/Hz
Cin, D 
Digital input capacitance
 
 
 
2
pF
t
r, f
 
Digital output rise/fall time
15 pF pure capacitive load
 
 
10
ns
t
r, f ,ckout
 
Clock output rise/fall time
10 pF pure capacitive load
 
 
15
ns
f
ckout, slow
 
Slow clock frequency
Tolerance +/- 1 kHz
 
32
 
kHz
 
AC Characteristics (continued)
Note 4:
Note 4:
Note 4:
Note 4:
Note 4: The maximum FSK bitrate and the output phase noise are dependent on the PLL settings (with the Extended Features
Command).
Note 5:
Note 5:
Note 5:
Note 5:
Note 5: Optimal antenna / admittance / inductance for the Si4022
Note 6:
Note 6:
Note 6:
Note 6:
Note 6: With selective resonant antennas (see: Application Notes available from http://www.silabs.com/integration).
Band
Y antenna [S]
Z antenna [
L antenna [nH]
868 MHz
1.35E-3  j1.2E-2
9 + j82
15.2
915 MHz
1.45E-3  j1.3E-2
8.7 + j77
13.6
 
Setting
(bw1, bw0)
Max. datarate
[kbps]
Phase noise at
1 MHz offset [dBc/Hz]
PLL bandwidth
00
19.2
-112
15 kHz
01
38.4
-110
30 kHz
10
64
-107
60 kHz (POR default)
11
115.2
-102
120 kHz
 
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