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Si4312
Low Gain:
Input RSSI in the range of
-45dBm ~ -15dBm
Scan
Medium Gain:
Input RSSI in the range of
-75dBm to -40dBm
High Gain:
Input RSSI in the range of
Sensitivity to -70dBm
Fc
Directions
Freq Bin 1
Freq Bin 2
Freq Bin 3
Figure 6. Frequency Scan Algorithm Depicting 3 Frequency Bins of 140 kHz and 3 Gain Settings
Frequency scanning is always enabled to find the transmitted signal. The scanning process stops after the correct
frequency band is found for the transmitted signal and is held throughout the duration of the packet plus a time of
no RF signal activity. This dead time is called “threshold hold time” and is described in section 3.7. Theshold hold
time allows a frequency found in the first packet of transmission to be held for any subsequent retransmissions of
packets if the retransmissions occur before the threshold hold time. This held frequency ensures all bits of the
second and subsequent packets are recovered completely. Frequency scanning resumes after the time of no RF
signal activity exceeds the threshold hold time.
3.7. Threshold Hold Time Selection
The threshold hold time is defined as the length of time the Si4312 keeps its slicer threshold voltage level when no
signals are present. If a signal does not appear after this time interval, the Si4312 will re-start the frequency scan
process and look for the signal in one of its three frequency bins. The threshold hold times are determined by the
bit settings chosen on pins 16 and 17 as shown in Table 12.
Table 12. Threshold Time Settings Based on TH[1:0] Logic Levels
TH1 (Pin 16)
0
0
1
1
TH0 (Pin 17)
0
1
0
1
Threshold Hold Time (ms)
70
100
300
500
3.8. Low Noise Amplifier Input Circuit
Figure 2 shows the typical application circuit with 50 ? matching. Components C3 and L1 are used to transform the
input impedance of the LNA. C3 is equal to 15 pF and L1 is equal to 33 nH at 433.92 MHz and 62 nH at 315 MHz
for 50 ? matching.
12
Rev. 0.5
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相关PDF资料
43A-015A SENSOR PRES 15PSIA 0-100MV TO-8
450-0004 KIT DEV PROFLEX01-R2 F ANTENNA
450-0021 KIT DEV SIFLEX02 WIRE ANTENNA
450-0023 KIT DEV PROFLEX01 F ANTENNA
450-0025 MODFLEX MGE W/SIFLEX02
450-0027 MODFLEX MGU W/SIFLEX02
450-0037 MODULE TIWI-R2 U.FL
450-0085 COM6L-T5 ADAPTER CARD WITH U.FL
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