mk5812 Integrated Device Technology, mk5812 Datasheet

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mk5812

Manufacturer Part Number
mk5812
Description
Low Emi Clock Generator
Manufacturer
Integrated Device Technology
Datasheet
LOW EMI CLOCK GENERATOR
Description
The MK5812 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 MK5812
offers both centered and down spread from a high-speed
clock input. The multiplier is a fixed 2x.
For different multiplier configurations, use the MK5811 (1x)
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
IDT™ / ICS™ LOW EMI CLOCK GENERATOR
The crystal requires external capacitors for
accurate tuning of the clock
Spread Direction
X1/CLK
FRSEL
X2
S1:0
2
Clock Buffer/
Ocsillator
Crystal
GND
VDD
1
Features
and Spread
PLL Clock
Synthesis
Spectrum
Circuitry
Packaged in 8-pin SOIC
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 8 to 64 MHz
2X 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
SSCLK
MK5812
DATASHEET
MK5812
REV A 020204

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mk5812 Summary of contents

Page 1

... LOW EMI CLOCK GENERATOR Description The MK5812 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 ...

Page 2

... MHz X1 8.0 to 16.0MHz X1 16.0 to 32.0MHz X2 8.0 to 16.0MHz X2 16.0 to 32.0MHz X2 32.0 to 64.0MHz X4 16.0 to 32.0MHz X4 32.0 to 64.0MHz X4 64.0 to 128MHz 2 S0 Spread Spread Pin 4 Direction Percentage 0 Center ±1.4 M Center ±1.1 1 Center ±0.6 0 Center ±0 Spread - 1 Down -1.6 0 Down -2.0 M Down -0.7 1 Down -3.0 MK5812 SSCG REV A 020204 ...

Page 3

... An optimum layout is one with all components on the same side of the board, thus minimizing vias through other signal layers. Other signal traces should be routed away from the MK5812 device. This includes signal traces located underneath the device layers adjacent to the ground plane layer used by the device. ...

Page 4

... PLL devices. Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK5812. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device, at these or any other conditions, above those indicated in the operational sections of the specifications is not implied ...

Page 5

... L Min. Typ. Max. Units 225 400 210 380 2.0 5.0 2.0 4 Min. Typ. Max. Units °C/W 150 °C/W 140 °C/W 120 °C/W 40 MK5812 REV A 020204 SSCG Units MHz MHz % % ...

Page 6

... MK5812STR MK5812SLF 5812SL MK5812SLFTR 5812SL While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Inc. (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied ...

Page 7

... MK5812 LOW EMI CLOCK GENERATOR Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales 800-345-7015 408-284-8200 Fax: 408-284-2775 Corporate Headquarters Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United States 800 345 7015 +408 284 8200 (outside U.S.) © ...

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