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PDF ICS844008-16 Data sheet ( Hoja de datos )

Número de pieza ICS844008-16
Descripción CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844008-16
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS844008-16 is an 8 output LVDS
ICS Synthesizer optimized to generate PCI Express
HiPerClockS™ reference clock frequencies and is a member
of the HiPerClocksTM family of high performance
clock solutions from ICS. Using a 25MHz
parallel resonant crystal, the following frequencies can be
generated based on F_SEL pin: 100MHz or 125MHz. The
ICS844008-16 uses ICS’ 3rd generation low phase noise
VCO technology and can achieve <1ps typical rms phase
jitter, easily meeting PCI Express jitter requirements. The
ICS844008-16 is packaged in a 32-pin LQFP package.
FEATURES
• Eight LVDS outputs
• Crystal oscillator interface
• Supports the following output frequencies:
100MHz or 125MHz
• VCO: 500MHz
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.44ps (typical)
• Full 3.3V supply modes
• 0°C to 70°C ambient operating temperature
• Available in both standard and lead-free RoHS compliant
packages
FREQUENCY SELECT FUNCTIONTABLE
PIN ASSIGNMENT
Input
Frequency
(MHz)
25MHz
25MHz
Input
F_SEL
0
1
M Divider
Value
20
20
N Divider
Value
4
5
M/N Divider
Value
5
4
Output
Frequency
(MHz)
125
100
BLOCK DIAGRAM
nPLL_SEL Pulldown
Q0
nQ0
Q1
1 nQ1
32 31 30 29 28 27 26 25
Q0 1
24 Q7
nQ0 2
23 nQ7
VDD 3 ICS844008-16 22 VDD
Q1
4
32-Lead LQFP
7mm x 7mm x 1.4mm
21
Q6
nQ1 5
package body
20 nQ6
GND 6
Y Package
19 GND
Q2 7
Top View
18 Q5
nQ2 8
17 nQ5
9 10 11 12 13 14 15 16
25MHz
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
500MHz
(w/25MHz
Reference)
0
÷4
÷5
Q2
nQ2
Q3
nQ3
Pullup
OE1
M = ÷20 (fixed)
Q4
nQ4
Q5
nQ5
Q6
nQ6
Q7
MR Pulldown
F_SEL Pullup
OE2 Pullup
nQ7
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.
844008AY-16
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 1, 2006
1

1 page




ICS844008-16 pdf
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844008-16
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
1k
TYPICAL PHASE NOISE AT 125MHZ AT 3.3V
PCI Express Jitter Filter
125MHz
RMS Phase Jitter (Random)
1.875Mhz to 20MHz = 0.44ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
PCI Express Filter to raw data
10k 100k 1M
OFFSET FREQUENCY (HZ)
10M
100M
844008AY-16
www.icst.com/products/hiperclocks.html
5
REV. A FEBRUARY 1, 2006

5 Page





ICS844008-16 arduino
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844008-16
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
PACKAGE OUTLINE -Y SUFFIX FOR 32 LEAD LQFP
844008AY-16
TABLE 9. PACKAGE DIMENSIONS
JEDEC VARIATION
ALL DIMENSIONS IN MILLIMETERS
SYMBOL
MINIMUM
BBA
NOMINAL
MAXIMUM
N 32
A -- -- 1.60
A1 0.05 -- 0.15
A2 1.35 1.40 1.45
b 0.30 0.37 0.45
c 0.09 -- 0.20
D 9.00 BASIC
D1 7.00 BASIC
D2 5.60 Ref.
E 9.00 BASIC
E1 7.00 BASIC
E2 5.60 Ref.
e 0.80 BASIC
L 0.45 0.60 0.75
θ 0° --
ccc --
--
Reference Document: JEDEC Publication 95, MS-026
7°
0.10
www.icst.com/products/hiperclocks.html
11
REV. A FEBRUARY 1, 2006

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