MC33493 Motorola, MC33493 Datasheet - Page 18

• Manufacturer Part Number: MC33493
• Description: PLL tuned UHF Transmitter for Data Transfer Applications
• Manufacturer: Motorola

XTAL1, 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 6 gives the optimized R_off values for two deviations. Note that there is
no footprint for R_off resistor on the layout figure 15. When used, this component can be soldered on top of C3.
RECOMMENDATIONS FOR FSK MODULATION
18
Figure 16: Schematic detailing the crystal load capacitance contributors
Freescale Semiconductor, Inc.
Table 8: Pads and tracks parasitic values
C_track_XTAL0
C_track_XTAL1
C_track_CFSK
C_pad_XTAL0
C_pad_XTAL1
C_pad_CFSK
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Capacitance
MC33493 Technical Data
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Value
1.5
1.5
1.5
1
1
1
Unit
pF
pF
pF
pF
pF
pF
MOTOROLA