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Datasheet: 40002A01 (Integrated Circuit Systems)

Femtoclocks Crystal-to Lvcmos/lvttl Frequency Synthesizer

 

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Integrated Circuit Systems

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Integrated
Circuit
Systems, Inc.
840002AG-01
www.icst.com/products/hiperclocks.html
REV. B JANUARY 13, 2006
1
ICS840002-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
G
ENERAL
D
ESCRIPTION
The ICS840002-01 is a 2 output LVCMOS/LVTTL
Synthesizer optimized to generate Ethernet
reference clock frequencies and is a member of
the HiPerClocks
TM
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_SEL1:0):
156.25MHz, 125MHz, and 62.5MHz. The ICS840002-01 uses
ICS' 3
rd
generation low phase noise VCO technology and can
achieve 1ps or lower typical random rms phase jitter, easily
meeting Ethernet jitter requirements. The ICS840002-01 is
packaged in a small 16-pin TSSOP package.
HiPerClockSTM
ICS
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
F_SEL0
nXTAL_SEL
TEST_CLK
OE
MR
nPLL_SEL
V
DDA
V
DD
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
F_SEL1
GND
GND
Q0
Q1
V
DDO
XTAL_IN
XTAL_OUT
ICS840002-01
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
F
EATURES
Two LVCMOS/LVTTL outputs @ 3.3V,
17
typical output impedance
Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
Output frequency range: 56MHz - 175MHz
VCO range: 560MHz - 700MHz
Output skew: 12ps (maximum)
RMS phase jitter at 156.25MHZ (1.875MHz - 20MHz):
0.47ps (typical)
Phase noise:
Offset
Noise Power
100Hz ............... -97.4 dBc/Hz
1
kHz .............. -120.2 dBc/Hz
10
kHz .............. -127.6 dBc/Hz
100
kHz .............. -126.1 dBc/Hz
Full 3.3V or 3.3V core/2.5V output supply mode
-30C to 85C ambient operating temperature
Available in both standard and lead-free RoHS compliant
packages
Q0
Q1
OE
F_SEL1:0
nPLL_SEL
nXTAL_SEL
XTAL_IN
XTAL_OUT
TEST_CLK
MR
OSC
Phase
Detector
VCO
M = 25 (fixed)
F_SEL1:0
0 0 4
0 1 5
1 0 10
1 1 5
0
1
1
0
2
N
25MHz
Pullup
Pulldown
Pulldown
Pulldown
Pullup:Pullup
Pulldown
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
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1
Integrated
Circuit
Systems, Inc.
840002AG-01
www.icst.com/products/hiperclocks.html
REV. B JANUARY 13, 2006
2
ICS840002-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
T
ABLE
1. P
IN
D
ESCRIPTIONS
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ABLE
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Integrated
Circuit
Systems, Inc.
840002AG-01
www.icst.com/products/hiperclocks.html
REV. B JANUARY 13, 2006
3
ICS840002-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
T
ABLE
3B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V5%, V
DDO
= 3.3V5%
OR
2.5V5%, T
A
= -30C
TO
85C
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5 V
Outputs, V
O
-0.5V to V
DDO
+ 0.5V
Package Thermal Impedance,
JA
89C/W (0 lfpm)
Storage Temperature, T
STG
-65C to 150C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional
operation of product at these conditions or any conditions be-
yond those listed in the
DC Characteristics
or
AC Character-
istics
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
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T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V5%, V
DDO
= 3.3V5%
OR
2.5V5%, T
A
= 0C
TO
70C
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5
A
m
Integrated
Circuit
Systems, Inc.
840002AG-01
www.icst.com/products/hiperclocks.html
REV. B JANUARY 13, 2006
4
ICS840002-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
T
ABLE
5A. AC C
HARACTERISTICS
,
V
DD
= V
DDA
= V
DDO
= 3.3V5%, T
A
= -30C
TO
85C
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
T
ABLE
5B. AC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V5%, V
DDO
= 2.5V5%, T
A
= -30C
TO
85C
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N
Integrated
Circuit
Systems, Inc.
840002AG-01
www.icst.com/products/hiperclocks.html
REV. B JANUARY 13, 2006
5
ICS840002-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
T
YPICAL
P
HASE
N
OISE
AT
62.5MH
Z
@3.3V
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
62.5MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.51ps (typical)
O
FFSET
F
REQUENCY
(H
Z
)
N
OISE
P
O
WER
dBc
Hz
Phase Noise Result by adding
1Gb Ethernet Filter to raw data
Raw Phase Noise Data
1Gb Ethernet Filter
100
1k
10k
100k
1M
10M
100M
T
YPICAL
P
HASE
N
OISE
AT
156.25MH
Z
@3.3V
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
156.25MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.47ps (typical)
O
FFSET
F
REQUENCY
(H
Z
)
N
OISE
P
O
WER
dBc
Hz
Phase Noise Result by adding
10Gb Ethernet Filter to raw data
Raw Phase Noise Data
10Gb Ethernet Filter
100
1k
10k
100k
1M
10M
100M
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