PRELIMINARY INFORMATION
ICS1726-11
Low EMI Clock Generator
Description
Features
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.
• 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
ICS offers many other clocks for computers and
computer peripherals. Consult us when you need to
remove crystals and oscillators from your board.
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
2
S1:0
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
SSCLK
X1/CLK
X1
Clock Buffer/
Crystal
Ocsillator
X2
GND
External caps required for with crystal
for accurate tuning of the clock
MDS 1726-11 A
1
Revision 092905
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
