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MK1707

Low EMI Clock Generator

Integrated Circuit Systems 

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

2

S1:0

Spread Direction

Low EMI Enable

ICLK

Input

Buffer

PLL Clock

Synthesis

and Spread

Spectrum

Circuitry

Clock Out

GND

MDS 1707 G

1

Revision 032204

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

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