MK1726A
Low EMI Clock Generator
Description
Features
The MK1726-01A/-02A/-04A devices generate 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, etc. Using ICS’
proprietary mix of analog and digital Phase Locked
Loop (PLL) technology, the device spreads the
frequency spectrum of the output and reduces the
frequency amplitude peaks by several dB. The
MK1726-01A/-02A/-04A devices offer 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 4 to 32 MHz.
• Output frequency range of 4 to 128 MHz
• 1X, 2X, 4X frequency multiplication
• 1X: MK1726-01A; 2X: MK1726-02A; 4X:
ICS offers many other clocks for computers and
computer peripherals. Consult ICS when you need to
remove crystals and oscillators from your board.
MK1726-04A
• 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
2
S1:0
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
Spread Direction
FRSEL
SSCLK
X1= 01A
X2= 02A
X4= 04A
X1/CLK
Clock Buffer/
Crystal
Ocsillator
X2
GND
The crystal requires external capacitors
for accurate tuning of the clock
MDS 1726A B
1
Revision 101703
Integrated Circuit Systems, Inc. z 525 Race Street, San Jose, CA 95126 z tel (408) 297-1201 z www.icst.com