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ICS840021AGT Datasheet

  • ICS840021AGT

  • FEMTOCLOCKS? CRYSTAL-TO-LVCMOS/ LVTTL CLOCK GENERATOR

  • 11頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS840021
F
EMTO
C
LOCKS
鈩?C
RYSTAL
-
TO
-
LVCMOS/LVTTL C
LOCK
G
ENERATOR
F
EATURES
鈥?/div>
1 LVCMOS/LVTTL output, 7鈩?output impedence
鈥?/div>
Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
鈥?/div>
Output frequency: 125MHz
鈥?/div>
VCO range: 560MHz to 680MHz
鈥?/div>
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.34ps (typical)
鈥?/div>
RMS phase noise at 125MHz (typical)
Phase noise:
Offset
Noise Power
100Hz ............... -96.9 dBc/Hz
1KHz .............. -122.2 dBc/Hz
10KHz .............. -131.1 dBc/Hz
100KHz .............. -129.5 dBc/Hz
鈥?/div>
3.3V operating supply
鈥?/div>
0擄C to 70擄C ambient operating temperature
鈥?/div>
Industrial temperature information available upon request
G
ENERAL
D
ESCRIPTION
The ICS840021 is a Gigabit Ethernet Clock
Generator and a member of the HiPerClocks
TM
HiPerClockS鈩?/div>
family of high performance devices from ICS. The
ICS840021 uses a 25MHz crystal to synthesize
125MHz. The ICS840021 has excellent phase jitter
performance, over the 1.875MHz 鈥?20MHz integration range.
The ICS840021 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
ICS
B
LOCK
D
IAGRAM
OE
25MHz
XTAL_IN
P
IN
A
SSIGNMENT
V
DDA
OE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
DD
Q0
GND
nc
OSC
XTAL_OUT
Phase
Detector
VCO
梅5
Q0
ICS840021
梅25
(fixed)
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
840021AG
www.icst.com/products/hiperclocks.html
1
REV. A NOVEMBER 30, 2004

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