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ICS8422002AGIT

Description
FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
File Size185KB,13 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS8422002AGIT Overview

FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER

PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS8422002I
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
LVHSTL F
REQUENCY
S
YNTHESIZER
F
EATURES
• Two LVHSTL outputs (VOHmax = 1.2V)
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 212.5MHz,
187.5MHz, 159.375MHz, 106.25MHz, 53.125MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.59ps (typical)
• Power supply modes:
Core/Output
3.3V/1.8V
2.5V/1.8V
• -40°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS-compliant
packages
G
ENERAL
D
ESCRIPTION
The ICS8422002I is a 2 output LVHSTL
Synthesizer optimized to generate Fibre
HiPerClockS™
Channel reference clock frequencies and is a
member of the HiPerClocks
TM
family of high
performance clock solutions from ICS. Using
a 26.5625MHz 18pF parallel resonant crystal, the following
frequencies can be generated based on the 2 frequency
select pins (F_SEL[1:0]): 212.5MHz, 187.5MHz,
159.375MHz, 106.25MHz and 53.125MHz. The
ICS8422002I uses ICS’ 3
rd
generation low phase noise
VCO technology and can achieve 1ps or lower typical rms
p h a s e j i t t e r, e a s i l y m e e t i n g F i b r e C h a n n e l j i t t e r
requirements. The ICS8422002I is packaged in a 20-pin
TSSOP package.
IC
S
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
Input
Frequency
(MHz)
26.5625
26.5625
26.5625
26.5625
23.4375
Inputs
M Divider N Divider
Value
Value
24
3
24
24
24
24
4
6
12
3
M/N
Divider Value
8
6
4
2
8
Output
Frequency
(MHz)
212.5
159.375
106.25
53.125
187.5
P
IN
A
SSIGNMENT
nc
V
DDO
Q0
nQ0
MR
nPLL_SEL
nc
V
DDA
F_SEL0
V
DD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
DDO
Q1
nQ1
GND
V
DD
nXTAL_SEL
TEST_CLK
XTAL_IN
XTAL_OUT
F_SEL1
F_SEL1 F_SEL0
0
0
1
1
0
0
1
0
1
0
ICS8422002I
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
Q0
B
LOCK
D
IAGRAM
F_SEL[1:0]
Pulldown
nPLL_SEL
Pulldown
TEST_CLK
Pulldown
26.5625MHz
2
1
1
XTAL_IN
OSC
XTAL_OUT
nXTAL_SEL
Pulldown
0
Phase
Detector
VCO
F_SEL[1:0]
0 0 ÷3
0 1 ÷4
1 0 ÷6
1 1 ÷12
nQ0
Q1
nQ1
0
M = 24 (fixed)
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.
8422002AGI
www.icst.com/products/hiperclocks.html
REV. B NOVEMBER 14, 2005
1

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