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Número de pieza | ICS840021 | |
Descripción | CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER | |
Fabricantes | Integrated Circuit Systems | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de ICS840021 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
No Preview Available ! Integrated
Circuit
Systems, Inc.
ICS840021
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS840021 is a Gigabit Ethernet Clock
Generator and a member of the HiPerClocksTM
HiPerClockS™ 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 – 20MHz integration range.
The ICS840021 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
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FEATURES
• 1 LVCMOS/LVTTL output, 7Ω output impedence
• Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
• Output frequency: 125MHz
• VCO range: 560MHz to 680MHz
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.34ps (typical)
• 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
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
BLOCK DIAGRAM
OE
25MHz
XTAL_IN
OSC
Phase
VCO
÷5
Q0
XTAL_OUT
Detector
÷25
(fixed)
PIN ASSIGNMENT
VDDA
OE
XTAL_OUT
XTAL_IN
1
2
3
4
8 VDD
7 Q0
6 GND
5 nc
ICS840021
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
1 page Integrated
Circuit
Systems, Inc.
ICS840021
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
1.65V ± 5%
VDD
www.DataSheet4U.com
LVCMOS
GND
-1.65V ± 5%
SCOPE
Qx
Phase Noise Plot
Phase Noise Mask
f1 Offset Frequency f2
RMS Jitter = Area Under the Masked Phase Noise Plot
3.3V OUTPUT LOAD AC TEST CIRCUIT
RMS PHASE JITTER
V
DD
Q0 2
Pulse Width
t
PERIOD
odc = t PW
t PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
20%
Clock
Outputs
80%
tR
80%
tF
20%
OUTPUT RISE/FALL TIME
840021AG
www.icst.com/products/hiperclocks.html
5
REV. A NOVEMBER 30, 2004
5 Page Integrated
Circuit
Systems, Inc.
ICS840021
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
Rev Table
A T10
A T8
Page
10
3
8
REVISION HISTORY SHEET
Description of Change
Ordering Information Table - correct count from 154 to 100.
Absolute Maximum Ratings - corrected Package Thermal Impedance air flow.
Corrected air flow in table.
Date
10/14/04
11/30/04
www.DataSheet4U.com
840021AG
www.icst.com/products/hiperclocks.html
11
REV. A NOVEMBER 30, 2004
11 Page |
Páginas | Total 11 Páginas | |
PDF Descargar | [ Datasheet ICS840021.PDF ] |
Número de pieza | Descripción | Fabricantes |
ICS840021 | CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER | Integrated Circuit Systems |
ICS840021I | CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER | Integrated Circuit Systems |
ICS840022 | CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER | Integrated Circuit Systems |
ICS840024I | CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER | Integrated Circuit Systems |
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