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PDF ICS840051I Data sheet ( Hoja de datos )

Número de pieza ICS840051I
Descripción CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER
Fabricantes Integrated Circuit Systems 
Logotipo Integrated Circuit Systems Logotipo



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Integrated
Circuit
Systems, Inc.
ICS840051I
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS840051I is a Gigabit Ethernet Clock
Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS. The
ICS840051I can synthesize 10 Gigabit Ethernet,
SONET, or Serial ATA reference clock fre-
quencies with the appropriate choice of crystal and output
divider. The ICS840051I has excellent phase jitter performance
and is packaged in a small 8-pin TSSOP, making it ideal for
www.DataSheeut4sUe.cinomsystems with limited board space.
FEATURES
1 LVCMOS/LVTTL output, 15output impedance
Crystal oscillator interface designed for
18pF parallel resonant crystals
Output frequency range: 70MHz - 170MHz
VCO range: 560MHz - 680MHz
RMS phase jitter at 155.52MHz (1.875MHz - 20MHz):
0.48ps (typical)
RMS phase noise at 155.52MHz
Offset Noise Power
100Hz ............... -99.7 dBc/Hz
1KHz ................ -120 dBc/Hz
10KHz ................ -128 dBc/Hz
100KHz ................ -127 dBc/Hz
3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
Lead-Free fully RoHS compliant
FREQUENCY TABLE
Inputs
Crystal Frequency (MHz)
20.141601
20.141601
19.53125
19.53125
19.44
19.44
18.75
18.75
FREQ_SEL
0
1
0
1
0
1
0
1
Output Frequency
(MHz)
161.132812
80.566406
156.25
78.125
155.52
77.76
150
75
BLOCK DIAGRAM
OE Pullup
FREQ_SEL Pulldown
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
560MHz-680MHz
÷32
(fixed)
0 ÷4 (default)
1 ÷8
840051AGI
www.icst.com/products/hiperclocks.html
1
PIN ASSIGNMENT
VDDA 1
8 VDD
OE 2
7 Q0
XTAL_OUT 3
6 GND
XTAL_IN 4
5 FREQ_SEL
Q0
ICS840051I
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
REV. A JANUARY 14, 2005

1 page




ICS840051I pdf
www.DataSheet4U.com
840051AGI
Integrated
Circuit
Systems, Inc.
ICS840051I
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
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 155.52MHZ (3.3V)
10GigE Filter
155.52MHz
RMS Phase Jitter (Random)
1.875Mhz to 20MHz = 0.48ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
10GigE 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 155.52MHZ (2.5V)
10GigE Filter
155.52MHz
RMS Phase Jitter (Random)
1.875Mhz to 20MHz = 0.50ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
10GigE Filter to raw data
1k 10k 100k 1M
OFFSET FREQUENCY (HZ)
www.icst.com/products/hiperclocks.html
5
10M
100M
REV. A JANUARY 14, 2005

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