
Complete Application Schematic and PCB for FSK Modulation
Figure 14. Application Schematic for FSK Modulation, Serial Configuration, 434 MHz Frequency Band
For 868 MHz band application, the input pin BAND must be wired to ground. See component description in Table 8 .
Table 8. External Components Description for FSK
Component
Y1
Function
Crystal
Value
315 MHz band: 9.84,
Unit
MHz
See Table 7
434 MHz band: 13.56,
see Table 7
868 MHz band: 13.56,
see Table 7
MHz
MHz
R1
RF output level setting
12
k Ω
resistor (R ext )
C3
C4
C2
C6
Crystal load capacitor
Power supply decoupling capacitor
See Table 9
22
100
pF
pF
nF
pF
Figure 15 shows the corresponding PCB layout.
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
Freescale Semiconductor
17