DATASHEET

LOW EMI CLOCK GENERATOR

MK1709

IDT™ LOW EMI CLOCK GENERATOR

1

MK1709

REV M 051310

Description

The MK1709 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 IDT’s

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 MK1709 offers centered 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.

IDT 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 (MK1709S) and in 8-pin TSSOP

(MK1709AG)

• Pb-free package

• Provides a spread spectrum output clock

• Supports flat panel controllers

• Guaranteed to +85° C operation

• Accepts a clock input, provides same frequency dithered

output

• Good for all VGA modes from 40 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

• Advanced, low-power CMOS process

Block Diagram

PLL Clock

Synthesis

and Spread

Spectrum

Circuitry

ICLK

Input

Buffer

S0

Low EMI Enable

Clock Out

GND

VDD

S1

S2