MK5811A Datasheet, PDF (1/7 Pages) Integrated Circuit Systems – Low EMI Clock Generator

MK5811A
Low EMI Clock Generator
Description
The MK5811A device generates a low EMI output clock
from a clock or crystal input. The device is designed to
dither a high emissions clock to lower EMI in consumer
applications. Using ICS’ proprietary mix of analog and
digital Phase Locked Loop (PLL) technology, the device
spreads the frequency spectrum of the output and
reduces the frequency amplitude peaks by several dB.
The MK5811A offers both centered and down spread
from a high-speed clock input.
For different multiplier configurations, use the MK5812
(2x) or MK5814 (4x).
ICS offers many other clocks for computers and
computer peripherals. Consult ICS when you need to
remove crystals and oscillators from your board.
Block Diagram
Features
• Packaged in 8-pin SOIC
• Available in Pb (lead) free package
• Provides a spread spectrum output clock
• Supports flat panel controllers
• Accepts a clock or crystal input (provides same
frequency dithered output)
• Input frequency range of 4 to 32 MHz
• Output frequency range of 4 to 32 MHz
• 1X frequency multiplication
• Center and down spread
• Peak reduction by 8 dB to 16 dB typical on 3rd
through 19th odd harmonics
• Low EMI feature can be disabled
• Includes power down
• Operating voltage of 3.3 V
• Advanced, low-power CMOS process
VDD
S1:0 ²
Spread Direction
FRSEL
X1/CLK
X2
Clock Buffer/
Crystal
Ocsillator
The crystal requires external capacitors for
accurate tuning of the clock
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
GND
SSCLK
MDS 5811A A
1
Revision 091205
Integrated Circuit Systems, Inc. z 525 Race Street, San Jose, CA 95126 z tel [phone] z www.icst.com