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ICS844004AGI-01

Description
FEMTOCLOCKS⑩ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER
File Size163KB,12 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS844004AGI-01 Overview

FEMTOCLOCKS⑩ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS844004I-01
F
EMTO
C
LOCKS
™C
RYSTAL
-
TO
-
LVDS F
REQUENCY
S
YNTHESIZER
F
EATURES
• Four LVDS outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 156.25MHz,
125MHz, 62.5MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.41ps (typical)
• Full 3.3V or 2.5V supply modes
• -40°C to 85°C ambient operating temperature
G
ENERAL
D
ESCRIPTION
The ICS844004I-01 is a 4 output LVDS Synthesizer
optimized to generate Ethernet reference clock
HiPerClockS™
frequencies and is a member of the HiPerClocks
TM
family of high performance clock solutions from
ICS. Using a 25MHz 18pF parallel resonant crystal,
the following frequencies can be generated based on the 2
frequency select pins (F_SEL[1:0]): 156.25MHz, 125MHz and
62.5MHz. The ICS844004I-01 uses ICS’ 3
rd
generation
low phase noise VCO technology and can achieve <1ps
typical rms phase jitter, easily meeting Ethernet jitter
requirements. The ICS844004I-01 is packaged in a small 24-
pin TSSOP package.
ICS
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
F_SEL1 F_SEL0
0
0
1
1
0
1
0
1
M Divider
Value
25
25
25
25
N Divider
Value
4
5
10
Not Used
M/N Divider
Value
6.25
5
2.5
Output
Frequency
(25MHz Ref.)
156.5
125
62.5
Not Used
P
IN
A
SSIGNMENT
nQ1
Q1
V
DD
o
Q0
nQ0
MR
nPLL_SEL
nc
V
DDA
F_SEL0
V
DD
F_SEL1
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
nQ2
Q2
V
DDO
Q3
nQ3
GND
V
DD
nXTAL_SEL
TEST_CLK
GND
XTAL_IN
XTAL_OUT
ICS844004I-01
B
LOCK
D
IAGRAM
F_SEL[1:0]
Pulldown
nPLL_SEL
Pulldown
Pulldown
25MHz
2
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
package body
G Package
Top View
Q0
1
F_SEL[1:0]
0 0 ÷4
0 1 ÷5
1 0 ÷10
1 1 not used
nQ0
Q1
nQ1
TEST_CLK
1
XTAL_IN
OSC
XTAL_OUT
nXTAL_SEL
Pulldown
0
Phase
Detector
VCO
625MHz
(w/25MHz
Reference)
0
Q2
nQ2
M = 25 (fixed)
Q3
nQ3
MR
Pulldown
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
844004AGI-01
www.icst.com/products/hiperclocks.html
REV. A JUNE 15, 2005
1

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