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Número de pieza | ICS4002I-01 | |
Descripción | CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER | |
Fabricantes | ICS | |
Logotipo | ||
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Integrated
Circuit
Systems, Inc.
ICS844002I-01
FEMTOCLOCKS™CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS844002I-01 is a 2 output LVDS
ICS Synthesizer optimized to generate Ethernet
HiPerClockS™ reference clock frequencies and is a mem-
ber 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 2 frequency
select pins (F_SEL[1:0]): 156.25MHz, 125MHz and
62.5MHz. The ICS844002I-01 uses ICS’ 3rd generation
low phase noise VCO technology and can achieve <1ps
typical rms phase jitter, easily meeting Ethernet jitter
requirements. The ICS844002I-01 is packaged in a small
20-pin TSSOP package.
FEATURES
• Two 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 2.5V supply mode
• -40°C to 85°C ambient operating temperature
• Available in both, standard and RoHS/Lead-Free compliant
packages
FREQUENCY SELECT FUNCTION TABLE
F_SEL1
0
0
1
1
F_SEL0
0
1
0
1
M Divider N Divider
Value
Value
25 4
25 5
25 10
Not Used
Output Frequency (MHz)
(25MHz Reference)
156.25
125
62.5
Not Used
BLOCK DIAGRAM
F_SEL[1:0] Pulldown
nPLL_SEL Pulldown
REF_CLK Pulldown
25MHz
XTAL_IN
OSC
XTAL_OUT
nXTAL_SEL Pulldown
1
0
2
Phase
Detector
VCO
625MHz
(w/25MHz
Reference)
M = 25 (fixed)
1
0
F_SEL[1:0]
0 0 ÷4
0 1 ÷5
1 0 ÷10
1 1 not used
MR Pulldown
844002AGI-01
www.icst.com/products/hiperclocks.html
1
PIN ASSIGNMENT
nc 1
2 0 VDDO
VDDO 2
19 Q1
Q0 3 18 nQ1
nQ0 4 17 GND
MR 5
16 VDD
nPLL_SEL 6 15 nXTAL_SEL
nc 7 14 REF_CLK
VDDA 8
13 XTAL_IN
F_SEL0 9 12 XTAL_OUT
VDD 10 11 F_SEL1
ICS844002I-01
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
Q0
nQ0
Q1
nQ1
REV. A JANUARY 5, 2006
1 page Integrated
Circuit
Systems, Inc.
ICS844002I-01
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 156.25MHZ
Ethernet Filter
156.25MHz
RMS Phase Jitter (Random)
1.875Mhz to 20MHz = 0.41ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
Ethernet Filter to raw data
10k
100k
1M
10M 100M
OFFSET FREQUENCY (HZ)
844002AGI-01
www.icst.com/products/hiperclocks.html
5
REV. A JANUARY 5, 2006
5 Page Integrated
Circuit
Systems, Inc.
PACKAGE OUTLINE - G SUFFIX FOR 20 LEAD TSSOP
ICS844002I-01
FEMTOCLOCKS™CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
844002AGI-01
TABLE 8. PACKAGE DIMENSIONS
SYMBOL
Millimeters
MIN MAX
N 20
A -- 1.20
A1 0.05 0.15
A2 0.80 1.05
b 0.19 0.30
c 0.09 0.20
D 6.40 6.60
E 6.40 BASIC
E1 4.30 4.50
e 0.65 BASIC
L 0.45 0.75
α 0° 8°
aaa -- 0.10
Reference Document: JEDEC Publication 95, MO-153
www.icst.com/products/hiperclocks.html
11
REV. A JANUARY 5, 2006
11 Page |
Páginas | Total 12 Páginas | |
PDF Descargar | [ Datasheet ICS4002I-01.PDF ] |
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