MC9S12E128 MOTOROLA [Motorola, Inc], MC9S12E128 Datasheet - Page 125

• Manufacturer Part Number: MC9S12E128
• Description: MC9S12E-Family Device User Guide V01.04
• Manufacturer: MOTOROLA [Motorola, Inc]

The loop bandwidth f
typical values are 50. ζ = 0.9 ensures a good transient response.
And finally the frequency relationship is defined as
With the above values the resistance can be calculated. The example is shown for a loop bandwidth
f
The capacitance C
The capacitance C
B.4.3.2 Jitter Information
The basic functionality of the PLL is shown in Figure B-2. With each transition of the clock f
deviation from the reference clock f
accordingly.The adjustment is done continuously with no abrupt changes in the clock output frequency.
Noise, voltage, temperature and other factors cause slight variations in the control loop resulting in a clock
jitter. This jitter affects the real minimum and maximum clock periods as illustrated in Figure B-3.
The basic functionality of the PLL is shown in Figure B-2. With each transition of the clock f
deviation from the reference clock f
C
=10kHz:
NOTE:
R
=
This section is under construction
C
2 π n f
---------------------------- -
s
p
s
can now be calculated as:
should be chosen in the range of:
⋅
f
C
C
=
should be chosen to fulfill the Gardner’s stability criteria by at least a factor of 10,
K
<
⋅
n
Φ
--------------------- -
π f
------------------------------------------
π
2 ζ
⋅
C
=
⋅
⋅
Freescale Semiconductor, Inc.
⋅
s
C
C


f
------------ -
2 ζ f
For More Information On This Product,
ζ
VCO
⁄
f
⋅
2
20
ref
⋅ ⋅
+
R
= 2*π*50*10kHz/(316.7Hz/Ω)=9.9kΩ=~10kΩ
ref
ref
≈
≤
1
is measured and input voltage to the VCO is adjusted
is measured and input voltage to the VCO is adjusted
=
0.516
-------------- - ζ
f
C
ref
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C
+
p
2
⋅
ζ
≤
R
2
⋅


(
C
;
synr
(
Þ
s
⁄
----- -
10
=
10
1
0.9
+
→
1
)
)
Device User Guide — 9S12E128DGV1/D V01.04
f
C
f
C
C
p
= 5.19nF =~ 4.7nF
<
< 25kHz
= 470pF
= 50
------------- - ζ
4 10
f
⋅
ref
;
(
=
0.9
)
cmp
cmp
, the
, the
125