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參數(shù)資料
| 型號： | MK2069-04GITR |
| 元件分類： | 時鐘產生/分配 |
| 英文描述： | 160 MHz, OTHER CLOCK GENERATOR, PDSO56 |
| 封裝： | 6.10 MM, 0.50 MM PITCH, TSSOP-56 |
| 文件頁數(shù)： | 17/19頁 |
| 文件大?。?/td> | 449K |
| 代理商： | MK2069-04GITR |
VCXO-Based Universal Clock Translator
MDS 2069-04 G
7
Revision 090905
Integr ated Circuit System s l 525 Ra ce Stree t , Sa n Jose, CA 951 26 l te l (4 08) 297 -1 201 l
MK2069-04
CP establishes a second pole in the VCXO PLL loop
filter. For higher damping factors (> 1), calculate the
value of CP based on a CS value that would be used for
a damping factor of 1. This will minimize baseband
peaking and loop instability that can lead to output jitter.
CP also dampens VCXO input voltage modulation by
the charge pump correction pulses. A CP value that is
too low will result in increased output phase noise at
the phase detector frequency due to this. In extreme
cases where input jitter is high, charge pump current is
high, and CP is too small, the VCXO input voltage can
hit the supply or ground rail resulting in non-linear loop
response.
The best way to set the value of CP is to use the filter
response software available from ICS (please refer to
the following section). CP should be increased in value
until it just starts affecting the passband peak.
Loop Filter Response Software
Online tools to calculate loop filter response can be
found at www.icst.com.
Graph of Charge Pump Current vs. Value of RSET (external resistor)
Charge Pump Current, Example Settings
from Above Graph
Setting Charge Pump Current
The recommended range for the charge pump current
is 25 A to 300 A. Below 25 A, loop filter charge
leakage, due to PCB or capacitor leakage, can become
a problem. This loop filter leakage can cause locking
problems, output clock cycle slips, or low frequency
phase noise.
As can be seen in the loop bandwidth and damping
factor equations or by using the filter response software
available from ICS, increasing charge pump current
(ICP) increases both bandwidth and damping factor.
10E-6
100E-6
1E-3
100E+3
1E+6
10E+6
RSET, ohms
I CP
,A
m
ps
Recommended Range
of Operation
RSET
Charge Pump Current
(ICP)
5 M
25
A
3 M
42
A
2 M
65
A
1 M
125
A
480 k
255
A
400 k
300
A
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