Datasheet

Clock Generator Module (CGMC)
Acquisition/Lock Time Specifications
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Clock Generator Module (CGMC) 127
7.9.3 Choosing a Filter
As described in Parametric Influences on Reaction Time, the external
filter network is critical to the stability and reaction time of the PLL. The
PLL is also dependent on reference frequency and supply voltage.
Either of the filter networks in Figure 7-10 is recommended when using
a 32.768-kHz reference crystal. In low-cost applications, where stability
and reaction time of the PLL is not critical, this filter network can be
replaced by a single capacitor.
Figure 7-10. PLL Filter
CGMXFC
10 k
0.01
µF
0.033
µF
V
SSA
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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