SI4020 데이터 시트보기 (PDF) - Silicon Laboratories
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SI4020 Datasheet PDF : 32 Pages
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Modulated RF Spectrum
At 433 MHz with
180 kHz Deviation at 64 kbps
15:46:09 Oct 29, 2003
Ref -10 dBm
#Peak
Log
10
dB/
Atten 5 dB
Si4020
At 868 MHz with
180 kHz Deviation at 64 kbps
15:43:45 Oct 29, 2003
Ref -10 dBm
#Peak
Log
10
dB/
Atten 5 dB
VAvg
100
W1S2
S3 FC
AA
VAvg
100
W1S2
S3 FC
AA
Center 434 MHz
Res BW 10 kHz
VBW 100 kHz
Span 2 MHz Center 868 MHz
Sweep 20.07 ms (2001 pts) Res BW 10 kHz
VBW 100 kHz
Span 2 MHz
Sweep 20.07 ms (2001 pts)
Spurious RF Spectrum
With 10 MHz CLK Output Enabled at 433 MHz
p
16:29:03 Jun 17, 2003
Ref 0 dBm
#Peak
Log
10
dB/
Atten 10 dB
1R
Mkr1 ∆ 20.0 MHz
-55.11 dB
Antenna Tuning Characteristics
750–970 MHz
16:54:54 Mar 11, 2003
Ref -36 dBm
Peak
Log
1
dB/
#Atten 0 dB
1
Mkr1 915.0 MHz
-37.62 dBm
*
Marker ∆
20.000000 MHz
-55.11 dB
W1S2
S3 FC
AA
Marker
915.000000 MHz
-37.62 dBm
V1 M2
S3 FC
1
AA
Center 434.8 MHz
#Res BW 3 kHz
#VBW 300 Hz
Span 50 MHz Start 700 MHz
Sweep 45.47 s (401 pts) #Res BW 1 MHz
VBW 1 MHz
Stop 1.05 GHz
Sweep 50 ms (401 pts)
The antenna tuning characteristics was recorded in “max-hold” state of the spectrum analyzer. During the measurement, the
transmitters were forced to change frequencies by forcing an external reference signal to the XTL pin. While the carrier was changing
the antenna tuning circuit switched trough all the available states of the tuning circuit. The graph clearly demonstrates that while the
complete output circuit had about a 40 MHz bandwidth, the tuning allows operating in a 220 MHz band. In other words the tuning
circuit can compensate for 25% variation in the resonant frequency due to any process or manufacturing spread.
11
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