MK1707
Low EMI Clock Generator
Description
The MK1707 generates a low EMI output clock from a
clock input. The part is designed to dither the LCD
interface clock for flat panel graphics controllers. The
device uses ICS’ proprietary mix of analog and digital
Phase Locked Loop (PLL) technology to spread the
frequency spectrum of the output, thereby reducing the
frequency amplitude peaks by several dB.
The MK1707 offers both centered and down spread
from a high speed clock input. Refer to the
MK1714-01/02 for a crystal input and the widest
selection of input frequencies and multipliers.
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
Available in Pb-free package
Industrial temperature range available
Provides a spread spectrum output clock
Supports ATI’s flat panel controllers
Guaranteed to +85°C operation
Accepts a clock input, provides same frequency
dithered output
•
Good for all VGA modes from 80 to 167 MHz
•
Peak reduction by 7dB - 14dB typical on 3rd - 19th
odd harmonics
•
•
•
•
Low EMI feature can be disabled
Includes Power-down
Operating voltage of 3.3 V or 5 V
Advanced, low-power CMOS process
Block Diagram
VDD
S1:0
Spread Direction
Low EMI Enable
2
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
Input
Buffer
Clock Out
ICLK
GND
MDS 1707 G
Integrated Circuit Systems, Inc.
●
1
525 Race Street, San Jose, CA 95126
●
Revision 032204
tel (408) 297-1201
●
www.icst.com
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
