MC68HC708MP16CFU

Manufacturer Part NumberMC68HC708MP16CFU
ManufacturerFreescale Semiconductor, Inc
MC68HC708MP16CFU datasheet
 
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Page 127/398:

Choosing a Filter Capacitor

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8.10.3 Choosing a Filter Capacitor
As described in
external filter capacitor, C
the PLL. The PLL is also dependent on reference frequency and supply
voltage. The value of the capacitor must, therefore, be chosen with
supply potential and reference frequency in mind. For proper operation,
the external filter capacitor must be chosen according to the following
equation:
For acceptable values of C
Acquisition/Lock Time
the voltage potential at which the MCU is operating. If the power supply
is variable, choose a value near the middle of the range of possible
supply values.
This equation does not always yield a commonly available capacitor
size, so round to the nearest available size. If the value is between two
different sizes, choose the higher value for better stability. Choosing the
lower size may seem attractive for acquisition time improvement, but the
PLL can become unstable. Also, always choose a capacitor with a tight
tolerance (±20% or better) and low dissipation.
8.10.4 Reaction Time Calculation
The actual acquisition and lock times can be calculated using the
equations below. These equations yield nominal values under the
following conditions:
MC68HC708MP16
Rev. 3.1
Freescale Semiconductor
8.10.2 Parametric Influences on Reaction
, is critical to the stability and reaction time of
F
C
=
C
F
FACT
, see
FACT
Specifications. For the value of V
Correct selection of filter capacitor, C
Filter
Capacitor.)
Room temperature operation
Negligible external leakage on CGMXFC
Negligible noise
Clock Generator Module (CGM)
Clock Generator Module (CGM)
Time, the
V
DDA
------------ -
f
RDV
Table 21-10. CGM
DDA
(See
8.10.3 Choosing a
F
Technical Data
, choose
127