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Recommendations for FSK Modulation
Device pad capacitance is defined by the package capacitance and by the internal circuitry. Typical capacitance values for these
pads are given in Table 11 .
Some realistic assumptions and measurements have been made concerning track parasitic capacitances for a 0.8 mm FR4
double side application PCB. They are given in Table 11 and the corresponding PCB layout is shown in figure Figure 17 .
To achieve large deviations, this total load capacitance must be lowered. For a given crystal, the PCB must be carefully laid out
to reduce the capacitance of the tracks wired to XTAL0, XTAL1, and CFSK pins.
Recommendation : a R_off resistor can be added in parallel with the FSK switch to optimize the transient response of
demodulated signal. Table 11 gives the optimized R_off values for two deviations. There is no footprint for R_off resistor on
the layout in Figure 16 . When used, this component can be soldered on top of C3.
Figure 16. Crystal Load Capacitance Contributors Schematic
Table 11. Pads and Tracks Parasitic Values
Capacitance
C_pad_XTAL0
C_pad_XTAL1
C_pad_CFSK
C_track_XTAL0
C_track_XTAL1
C_track_CFSK
Value
1
1
1
1.5
1.5
1.5
Unit
pF
pF
pF
pF
pF
pF
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
Freescale Semiconductor
19
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