MC33493A Datasheet, PDF (17/22 Pages) Freescale Semiconductor, Inc – PLL Tuned UHF Transmitter for Data Transfer Applications

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
Function
Value
Unit
Y1
Crystal
315 MHz band: 9.84,
See Table 7
434 MHz band: 13.56,
see Table 7
868 MHz band: 13.56,
see Table 7
R1
RF output level setting
resistor (R_ext)
C3
Crystal load capacitor
12
See Table 9
C4
C2
Power supply decoupling capacitor
22
C6
100
MHz
MHz
MHz
kΩ
pF
pF
nF
pF
Figure 15 shows the corresponding PCB layout.
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 2
Freescale Semiconductor
17