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PDF ICS844071I Data sheet ( Hoja de datos )
| Número de pieza | ICS844071I | |
| Descripción | CRYSTAL-TO- LVDS CLOCK GENERATOR | |
| Fabricantes | ICS | |
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844071I
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS844071I is a Serial ATA (SATA)/Serial
Attached SCSI (SAS) Clock Generator and a
HiPerClockS™ member of the HiPerClocksTM family of high
performance devices from ICS. The ICS844071I
uses an 18pF parallel resonant crystal over the
range of 20.833MHz - 28.3MHz. For SATA/SAS applications,
a 25MHz crystal is used and either 75MHz or 150MHz may
be selected with the FREQ_SEL pin. The ICS844071I has
excellent <1ps phase jitter performance, over the 12kHz -
20MHz integration range. The ICS844071I 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
(20.833MHz - 28.3MHz)
• Output frequency range: 62.5MHz - 170MHz
• VCO range: 500MHz - 680MHz
• RMS phase jitter @ 150MHz, using a 25MHz crystal
(12kHz - 20MHz): 0.75ps (typical)
• 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Replaces ICS844051-11
COMMON CONFIGURATION TABLE
Inputs
Crystal Frequency (MHz) FREQ_SEL M
25
25
26.041666
26.041666
26.5625
26.5625
0 24
1 24
0 24
1 24
0 24
1 24
Output Frequency
N
Multiplication Value
M/N
(MHz)
46
150
83
75
46
156.25
83
78.125
46
159.375
83
79.675
BLOCK DIAGRAM
FREQ_SEL Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
500MHz - 680MHz
M = ÷24 (fixed)
FREQ_SEL N
0 ÷4
1 ÷8
PIN ASSIGNMENT
VDDA 1
8 VDD
GND 2
7Q
XTAL_OUT 3
6 nQ
Q
XTAL_IN 4
5 FREQ_SEL
nQ
ICS844071I
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.
844071AGI
www.icst.com/products/hiperclocks.html
REV. A JULY 13, 2005
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844071I
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
Clock 20%
Outputs
80%
tR
80%
tF
OUTPUT RISE/FALL TIME
VSW I N G
20%
LVDS 2.5V OUTPUT LOAD AC TEST CIRCUIT
nQ
Q
t PW
t
PERIOD
odc = t PW x 100%
t PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
Phase Noise Plot
VDDDD
Phase Noise Mask
DC Input LVDS
f1 Offset Frequency f2
RMS Jitter = Area Under the Masked Phase Noise Plot
out
➤
out VOS/Δ VOS
RMS PHASE JITTER
VVDDDD
DC Input LVDS
OFFSET VOLTAGE SETUP
out
➤
100 VOD/Δ VOD
out
DIFFERENTIAL OUTPUT VOLTAGE SETUP
844071AGI
www.icst.com/products/hiperclocks.html
5
REV. A JULY 13, 2005
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ICS844071I.PDF ] | |
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