PRELIMINARY INFORMATION
ICS1726-11
Low EMI Clock Generator
Description
The ICS1726-11 generates a low EMI output clock
from a clock or crystal input. The part is designed to
dither the LCD interface clock for PDAs, printers,
scanners, modems, copiers, and others. Using ICS’
proprietary mix of analog and digital Phase-Locked
Loop (PLL) technology, the device spreads the
frequency spectrum of the output, reducing the
frequency amplitude peaks by several dB. The
ICS1726-11 offers both centered and down spread
from a high-speed clock input.
ICS offers many other clocks for computers and
computer peripherals. Consult us when you need to
remove crystals and oscillators from your board.
Features
•
•
•
•
•
•
•
•
•
•
•
•
Packaged in 8-pin SOIC/TSSOP
Provides a spread spectrum output clock
Supports flat panel controllers
Accepts a clock or crystal input (provides same
frequency dithered output)
Input frequency range of 16 to 32 MHz
Output frequency range of 16 to 32 MHz
Center and down spread
Peak reduction by 8 dB to 16 dB typical on 3rd
through 19th odd harmonics
Low EMI feature can be disabled
Includes power down
Operating voltage of 3.3 V
Advanced, low-power CMOS process
Block Diagram
VDD
S1:0
2
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
SSCLK
X1/CLK
Clock Buffer/
Crystal
Ocsillator
X2
External caps required for with crystal
for accurate tuning of the clock
X1
GND
MDS 1726-11 A
Integrated Circuit Systems, Inc.
●
1
525 Race Street, San Jose, CA 95126
●
Revision 092905
tel (408) 297-1201
●
www.icst.com
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
