MK2059-01 Просмотр технического описания (PDF) - Integrated Circuit Systems
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MK2059-01 Datasheet PDF : 10 Pages
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MK2059-01
VCXO-Based Frame Clock Frequency Translator
PLL Loop Filter Components
All analog PLL circuits use a loop filter to establish
operating stability. The MK2059-01 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
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
3088
001
3072
010
2048
011
2208
M0 0
2316
M0 1
2500
M1 0
3125
M1 1
3240
100
2430
101
2560
110
3088
111
3072
RSET
120 kΩ
120 kΩ
120 kΩ
120 kΩ
120 kΩ
120 kΩ
120 kΩ
120 kΩ
120 kΩ
120 kΩ
120 kΩ
120 kΩ
RZ
1.0 MΩ
1.0 MΩ
1.0 MΩ
1.0 MΩ
1.0 MΩ
1.0 MΩ
1.0 MΩ
1.0 MΩ
1.0 MΩ
1.0 MΩ
1.0 MΩ
1.0 MΩ
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)
18 Hz
19 Hz
27 Hz
26 Hz
24 Hz
22 Hz
18 Hz
17 Hz
23 Hz
22 Hz
18 Hz
19 Hz
Damping
Factor
1.4
1.4
1.7
1.7
1.6
1.6
1.4
1.4
1.6
1.6
1.4
1.4
MDS 2059-01 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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