DATASHEET

LOW EMI CLOCK GENERATOR

MK1704A

IDT™ LOW EMI CLOCK GENERATOR

1

MK1704A

REV G 051310

Description

The MK1704A is an upgraded version of the MK1704 and is

recommended for all new designs. It offers more reduction

in the frequency amplitude peaks and will support

frequencies up to 140 MHz.

The MK1704A generates a low EMI output clock from a

clock input. The part is designed to dither the LCD interface

clock or other clocks for flat panel graphics controllers. The

MK1704A uses IDT’s proprietary mixture of analog and

digital Phase Locked Loop (PLL) technology to synthesize

the frequency. It also uses IDT’s patented technique to

spread the frequency spectrum of the output, thereby

reducing the frequency amplitude peaks by several dB.

IDT offers many other clocks for computers and computer

peripherals. Consult IDT when you need to remove crystals

and oscillators from your board.

Features

• 8 pin SOIC package

• Pb (lead) free package

• Provides a spread spectrum output clock

• Supports leading flat panel controllers

• Accepts a clock input, provides same frequency dithered

output

• Optimized for higher resolutions that require up to 140

MHz, as well as 40 MHz (SVGA) and 65 MHz (XVGA)

clocks

• Peak reduction by 7 dB - 14 dB typical on 3rd - 19th odd

harmonics

• Low EMI feature can be disabled

• Operating voltage of 3.3V or 5V

• Advanced, low power CMOS process

• See the MK1714-01 for a multiplier with low EMI which

can operate from a crystal

Block Diagram

Input

Buffer

PLL Clock

Synthesis

and Spread

Spectrum

Circuitry

CLK

S1:0

2

VDD

GND

Low EMI Enable

Input