AN383 查看數據表（PDF） - Silicon Laboratories
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AN383 Datasheet PDF : 69 Pages
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AN383
functionality is not used.
C16 (3.3 pF) is an optional filter capacitor for AMI pin 4 on Si473x devices and may be placed to shunt VCO energy
to GND and prevent it from radiating from an antenna connected to the AMI pin. Place C16 as close as possible to
AMI pin 4 and RFGND pin 3. The ground path should be optimized on the top layer. Route pin 4 to GND/RFGND if
the pin functionality is not used.
2.2.3. GPIO Mitigation Components
Table 4. GPIO Mitigation Components
Option
1
2
Components
C15 = 33 pF
R20 = 330
C18 = 33 pF
R19 = 330
C15 = 33 pF
R20 = 330
C18 = NP
R19 = 330
Sensitivity
Best
Best
Mitigation
Best
Cost
Low
Good
Low
C15 (33 pF) is an optional filter capacitor for GPO1 pin 19 and may be placed to shunt VCO energy to GND and
prevent it from radiating. Place C15 as close as possible to GPO1 pin 19. The ground path should be optimized on
the top layer.
R20 (330 ) is an optional mitigating resistor for GPO1 pin 19 and may be placed to prevent VCO energy from
radiating from GPO1 pin. Place R20 as close as possible to GPO1 pin 19. R20 is not required if GPO1 is pulled up/
down by design and has no other connections.
C18 (33 pF) is an optional filter capacitor for GPO2 pin 18 and may be placed to shunt VCO energy to GND and
prevent it from radiating. Place C18 as close as possible to GPO2 pin 18. The ground path should be optimized on
the top layer.
R19 (330 ) is an optional mitigating resistor for GPO2 pin 18 and may be placed to prevent VCO energy from
radiating from GPO2 pin. Place R19 as close as possible to GPO2 pin 18. R19 is not required if GPO2 is pulled up/
down by design and has no other connections.
2.2.4. LPI Mitigation Components
Table 5. LPI Mitigation Components
Option
1
Components
C4 = 3.3 pF
L1 = 15 nH
Sensitivity
Best
Mitigation
Best
Cost
Low
C4 (3.3 pF) is an optional filter capacitor for TXO/LPI pin 4 on Si4704/05/06/1x/2x devices and may be placed to
shunt VCO energy to GND and prevent it from radiating from an antenna connected to the TXO/LPI pin. Make
measurements with different C4 and L1 values in-system to optimize the filter’s performance for the antenna
design chosen. Place C4 as close as possible to TXO/LPI pin 4 and RFGND pin 3. The ground path should be
optimized on the top layer. Route pin 4 to GND/RFGND if the pin functionality is not used.
L1 (15 nH) is an optional filter inductor for TXO/LPI pin 4 on Si4704/05/06/1x/2x devices and may be placed to
prevent VCO energy from radiating from an antenna connected to the TXO/LPI pin. Make measurements with
different C4 and L1 values in-system to optimize the filter’s performance for the antenna design chosen. Place L1
as close as possible to TXO/LPI pin 4. Route pin 4 to GND/RFGND if the pin functionality is not used.
8
Rev. 0.8
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