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Integrated Circuit Systems - CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER

Numéro de référence ICS840001
Description CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER
Fabricant Integrated Circuit Systems 
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ICS840001 fiche technique
Integrated
Circuit
Systems, Inc.
ICS840001
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS840001 is a Fibre Channel Clock
Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS. The
ICS840001 uses a 26.5625MHz crystal to
synthesize either 106.25MHz or 212.5MHz, using
the FREQ_SEL pin. The ICS840001 has excellent phase jitter
performance, over the 637KHz – 10MHz integration range.
The ICS840001 is packaged in a small 8-pin TSSOP, making
www.DataSheeitt4iUd.ecaolmfor use in systems with limited board space.
FEATURES
1 LVCMOS/LVTTL output, 7typical output impedence
Crystal oscillator interface designed for 26.5625MHz,
18pF parallel resonant crystal
Selectable 106.25MHz or 212.5MHz output frequency
VCO range: 560MHz to 680MHz
RMS phase jitter @ 106.25MHz, using a 26.5625MHz crystal
(637KHz - 10MHz): 0.696ps (typical)
RMS phase noise at 106.25MHz (typical)
Phase noise:
Offset
Noise Power
100Hz ............... -94.4 dBc/Hz
1KHz .............. -119.9 dBc/Hz
10KHz .............. -130.2 dBc/Hz
100KHz .............. -131.5 dBc/Hz
3.3V operating supply
-30°C to 85°C ambient operating temperature
FUNCTION TABLE
Input
Output Frequencies
FREQ_SEL
0 106.25MHz (Default)
1 212.5MHz
Crystal: 26.5625MHz
BLOCK DIAGRAM
OE (Pullup)
FREQ_SEL (Pulldown)
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
637.5MHz w/
26.5625MHz Ref.
M = ÷24 (fixed)
PIN ASSIGNMENT
÷3 1
÷6 0
Q0
VDDA
OE
XTAL_OUT
XTAL_IN
1
2
3
4
8 VDD
7 Q0
6 GND
5 FREQ_SEL
ICS840001
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
840001BG
www.icst.com/products/hiperclocks.html
1
REV. A MAY 10, 2004

PagesPages 12
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