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PDF ICS840004-11 Data sheet ( Hoja de datos )
| Número de pieza | ICS840004-11 | |
| Descripción | CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS840004-11
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS840004-11 is a 4 output LVCMOS/
ICS LVTTL Synthesizer optimized to generate
HiPerClockS™ 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, 125MHz and
62.5MHz can be generated based on one frequency select
pin (F_SEL). The ICS840004-11 uses ICS’ 3rd generation low
www.DataSheept4hUa.sceomnoise VCO technology and can achieve 1ps or lower
typical random rms phase jitter, easily meeting Ethernet jitter
requirements. The ICS840004-11 is packaged in a small
20-pin TSSOP package.
FEATURES
• Four LVCMOS/LVTTL outputs, 15Ω typical output imped-
ance
• Crystal oscillator interface
• Input frequency range: 22.4MHz to 28MHz
• Output frequency Range: 56MHz - 140MHz
• VCO Range: 560MHz - 700MHz
• RMS phase jitter at 125MHz (1.875MHz - 20MHz):
0.70ps (typical)
• RMS phase noise at 125MHz:
• Full 3.3V supply
• 0°C to 70°C ambient operating temperature
• Available in both standard and lead-free RoHS-compliant
packages
FREQUENCY SELECT FUNCTION TABLE FOR ETHERNET FREQUENCIES
F_SEL
0
1
Inputs
M Divider N Divider
Value
Value
25 10
25 5
M/N
Ratio Value
2.5
5
Output Frequency
(25MHz Ref.)
62.5
125
BLOCK DIAGRAM
PIN ASSIGNMENT
OE Pullup
F_SEL Pullup
25MHz
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
M = ÷25 (fixed)
F_SEL
N
0 ÷10
1 ÷5
Q0
Q1
Q2
Q3
F_SEL 1 20 nc
nc 2 19 GND
nc 3 18 Q0
nc 4 17 Q1
OE 5
1 6 VDDO
nc 6 15 Q2
nc 7 14 Q3
VDDA 8
13 GND
nc 9 12 XTAL_IN
VDD 10 11 XTAL_OUT
ICS840004-11
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
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.
840004AG-11
www.icst.com/products/hiperclocks.html
REV. A OCTOBER 3, 2005
1
1 page  
www.DataSheet4U.com
840004AG-11
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS840004-11
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
TYPICAL PHASE NOISE AT 62.5MHZ @3.3V
1Gb Ethernet Filter
62.5MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.54ps
Raw Phase Noise Data
Phase Noise Result by adding
1Gb Ethernet Filter to raw data
1k
10k 100k
1M
10M
100M
OFFSET FREQUENCY (HZ)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
TYPICAL PHASE NOISE AT 125MHZ @2.5V
1Gb Ethernet Filter
125MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.70ps
Raw Phase Noise Data
Phase Noise Result by adding
1Gb Ethernet Filter to raw data
1k 10k 100k 1M
OFFSET FREQUENCY (HZ)
www.icst.com/products/hiperclocks.html
5
10M
100M
REV. A OCTOBER 3, 2005
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ICS840004-11.PDF ] | |
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