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PDF ICS844021I-01 Data sheet ( Hoja de datos )
| Número de pieza | ICS844021I-01 | |
| Descripción | CRYSTAL-TO- LVDS CLOCK GENERATOR | |
| Fabricantes | ICS | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844021I-01
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS844021I-01 is an Ethernet Clock
Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS. The
ICS844021I-01 uses an 18pF parallel resonant
crystal over the range of 24.5MHz - 34MHz. For
Ethernet applications, a 25MHz crystal is used. The
ICS844021I-01 has excellent <1ps phase jitter performance,
over the 1.875MHz - 20MHz integration range. The
ICS844021I-01 is packaged in a small 8-pin TSSOP, making
it ideal for use in systems with limited board space.
FEATURES
• (1) Differential LVDS output
• Crystal oscillator interface, 18pF parallel resonant crystal
(24.5MHz - 34MHz)
• Output frequency range: 122.5MHz - 170MHz
• VCO range: 490MHz - 680MHz
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.45ps (typical)
• 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
COMMON CONFIGURATION TABLE - Gb ETHERNET
Inputs
Crystal Frequency (MHz) M
25
26.666
33.33
20
20
20
N
Multiplication
Value M/N
45
45
45
Output Frequency
(MHz)
125
133.33
166.66
BLOCK DIAGRAM
OE Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
490MHz - 680MHz
N = ÷4 (fixed)
M = ÷20 (fixed)
Q0
nQ0
PIN ASSIGNMENT
VDDA
GND
XTAL_OUT
XTAL_IN
1
2
3
4
8 VDD
7 Q0
6 nQ0
5 OE
ICS844021I-01
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
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.
844021AGI-01
www.icst.com/products/hiperclocks.html
REV. A MARCH 29, 2005
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844021I-01
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
3.3V±5%
POWER SUPPLY
+ Float GND -
LVDS
Qx SCOPE
nQx
2.5V±5%
POWER SUPPLY
+ Float GND -
LVDS
Qx SCOPE
nQx
LVDS 3.3V OUTPUT LOAD AC TEST CIRCUIT
LVDS 2.5V OUTPUT LOAD AC TEST CIRCUIT
Phase Noise Plot
Phase Noise Mask
f1 Offset Frequency f2
RMS Jitter = Area Under the Masked Phase Noise Plot
nQ0
Q0
Pulse Width
t
PERIOD
odc = t PW
t PERIOD
RMS PHASE JITTER
Clock 20%
Outputs
80%
tR
80%
tF
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
VVDDDD
out
VSW I N G
20%
DC Input LVDS
out
➤
VOS/Δ VOS
OUTPUT RISE/FALL TIME
OFFSET VOLTAGE SETUP
VDDDD
DC Input LVDS
out
➤
100 VOD/Δ VOD
out
DIFFERENTIAL OUTPUT VOLTAGE SETUP
844021AGI-01
www.icst.com/products/hiperclocks.html
5
REV. A MARCH 29, 2005
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ICS844021I-01.PDF ] | |
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