DATASHEET
LOW EMI CLOCK GENERATOR MK1709
IDT™ VB
LOW EMI CLOCK GENERATOR 1
MK1709 REV K 121809
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)
• Available in lead (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
NOTE: EOL for non-green parts to occur on 5/13/10
per PDN U-09-01
Block Diagram
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
ICLK
Input
Buffer
S0
Low EMI Enable
Clock Out
GND
VDD
S1
S2
