MK2058-01 查看數據表（PDF） - Integrated Circuit Systems
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MK2058-01 Datasheet PDF : 10 Pages
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MK2058-01
Communications Clock Jitter Attenuator
To obtain a list of qualified crystal devices that meet
these requirements, please contact ICS MicroClock
applications department.
PLL Loop Filter Components
All analog PLL circuits use a loop filter to establish
operating stability. The MK2058-01 uses external loop
filter components for the following reasons:
1) Larger loop filter capacitor values can be used,
allowing a lower loop bandwidth. This enables the use
of lower input clock reference frequencies and also
input clock jitter attenuation capabilities. Larger loop
filter capacitors also allow higher loop damping factors
when less passband peaking is desired.
2) The loop filter values can be user selected to
optimize loop response characteristics for a given
application.
Referencing the External Component Schematic on
this page, the external loop filter is made up of the
components RZ, C1 and C2. RSET establishes PLL
charge pump current and therefore influences loop
filter characteristics.
External Component Schematic
CL
CL
Do n’t S tuff
(Refer to Optional
Crystal Tuning
section)
X1
VDD
VDD
VDD
VIN
C2
RZ
GND
GND
C1
GND
CHGP
IS E T
Xtal
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
X2
GND
IS E L
IC L K 1
IC L K 2
SEL0
CLK
NC
SEL1
SEL2
R SET
Recommended Loop Filter Values Vs. Output Frequency Range Selection
Crystal
SEL2 SEL1 SEL0 Multiplier
(N)
000
3072
001
16
010
10
011
6
M0 0
2048
M0 1
1716
M1 0
384
M1 1
128
100
4
101
3
110
2
111
1
RSET
120 kΩ
1.4 MΩ
1.4 MΩ
1.4 MΩ
540 kΩ
540 kΩ
1.4 MΩ
1.4 MΩ
1.4 MΩ
1.4 MΩ
1.4 MΩ
1.4 MΩ
RZ
750 kΩ
160 kΩ
130 kΩ
100 kΩ
1.2 MΩ
1.1 MΩ
820 kΩ
470 kΩ
82 kΩ
68 kΩ
56 kΩ
39 kΩ
C1
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
C2
4.7 nF
4.7 nF
4.7 nF
4.7 nF
4.7 nF
4.7 nF
4.7 nF
4.7 nF
4.7 nF
4.7 nF
4.7 nF
4.7 nF
Note: For SEL input pin programming: 0 = GND, 1 = VDD, M = Floating
Loop
Bandwidth
(-3dB point)
14 Hz
60 Hz
75 Hz
95 Hz
8.5 Hz
9 Hz
12 Hz
20 Hz
120 Hz
130 Hz
160 Hz
225 Hz
Damping
Factor
1
1
1
1
1
1
1
1
1
1
1
1
MDS 2058-01 B
4
Revision 071001
Integrated Circuit Systems, Inc. q 525 Race Street, San Jose, CA 95126 q tel (408) 295-9800 q www.icst.com
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