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ICS843004AG-01 Datasheet(PDF) 1 Page - Integrated Circuit Systems

Part # ICS843004AG-01
Description  FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS843004AG-01 Datasheet(HTML) 1 Page - Integrated Circuit Systems

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843004AG-01
www.icst.com/products/hiperclocks.html
REV. B MAY 6, 2005
1
Integrated
Circuit
Systems, Inc.
ICS843004-01
FEMTOCLOCKS™CRYSTAL-TO-
3.3V LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS843004-01 is a 4 output LVPECL
synthesizer optimized to generate Ethernet
reference clock frequencies and is a member of
the HiPerClocksTM family of high performance clock
solutions from ICS. Using a 25MHz 18pF parallel
resonant crystal, the following frequencies can be generated
based on the settings of 2 frequency select pins (F_SEL[1:0]):
156.25MHz, 125MHz, 62.5MHz. The ICS843004-01 uses
ICS’ 3rd generation low phase noise VCO technology and can
achieve 1ps or lower typical rms phase jitter, easily meeting
Ethernet jitter requirements. The ICS843004-01 is packaged
in a small 24-pin TSSOP package.
FEATURES
• Four 3.3V LVPECL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies:
156.25MHz, 125MHz and 62.5MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.57ps (typical)
• RMS phase noise at 156.25MHz (typical)
Phase noise:
Offset
Noise Power
100Hz ............... -95.5 dBc/Hz
1KHz ................ -118 dBc/Hz
10KHz ................ -126 dBc/Hz
100KHz .............. -126.6 dBc/Hz
• Full 3.3V supply mode
• -30°C to 85°C ambient operating temperature
HiPerClockS™
ICS
PIN ASSIGNMENT
1
1
0
1
0
Phase
Detector
VCO
625MHz
(w/25MHz
Reference)
OSC
M = 25 (fixed)
F_SEL[1:0]
0 0 ÷4
0 1 ÷5
1 0 ÷10
1 1 not used
2
ICS843004-01
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
package body
G Package
Top View
nQ1
Q1
VCCo
Q0
nQ0
MR
nPLL_SEL
nc
VCCA
F_SEL0
VCC
F_SEL1
1
2
3
4
5
6
7
8
9
10
11
12
nQ2
Q2
VCCO
Q3
nQ3
VEE
VCC
nXTAL_SEL
TEST_CLK
VEE
XTAL_IN
XTAL_OUT
24
23
22
21
20
19
18
17
16
15
14
13
BLOCK DIAGRAM
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25
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2
6
11
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FREQUENCY SELECT FUNCTION TABLE
F_SEL[1:0]
nPLL_SEL
TEST_CLK
XTAL_IN
XTAL_OUT
nXTAL_SEL
MR
Q0
nQO
Q1
nQ1
Q2
nQ2
Q3
nQ3
Pulldown
Pulldown
25MHz
Pulldown
Pulldown
Pulldown


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