ICS477-05
Quad PLL with VCXO for HDTV
Description
The ICS477-05 generates five high-quality,
high-frequency clock outputs including two reference
outputs from a low frequency pullable crystal. It is
designed to replace crystals and crystal oscillators in
most electronic systems.
Using Phase-Locked-Loop (PLL) techniques, the
device runs from a fundamental mode, pullable crystal.
It can replace multiple crystals and oscillators, saving
board space and cost.
Features
•
Packaged in 28-pin SSOP (QSOP)
•
Available in Pb-free packaging
•
Replaces a VCXO plus multiple crystals and
oscillators
•
On-chip patented VCXO pull range 200 ppm
(minimum)
•
•
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•
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Duty cycle of 45/55
Operating voltage of 3.3V
Advanced, low power, CMOS process
Input crystal frequency of 27 MHz
Five output clocks
Industrial temperature range available
Block Diagram
VDD
6
VIN
27 MHz
Pullable
Crystal
X1
Voltage
Controlled
Crystal
Oscillator
PLLA
Divide
Logic
and
Output
Enable
Control
54.054M
PLLB
PLLC
PLLD
74.175M
X2
External capacitors
may be required
54M
2
27M
10
PDTS
GND
MDS 477-05 H
Integrated Circuit Systems, Inc.
●
1
525 Race Street, San Jose, CA 95126
●
Revision 062404
tel (408) 297-1201
●
www.icst.com
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
