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MK3720STR

27 MHz and 54 MHz 3.3 Volt VCXO

Integrated Circuit Systems 

MK3720

27 MHz and 54 MHz 3.3 Volt VCXO

Description

The MK3720 is a low cost, low jitter, high

performance 3.3 Volt VCXO and PLL clock

synthesizer designed to replace expensive 13.5, 27,

or 54MHz VCXOs. The patented on-chip

Voltage Controlled Crystal Oscillator accepts a

0 to 3.3 V input voltage to cause the output clocks

to vary by ±100 ppm. Using our patented VCXO

and analog/digital Phase-Locked Loop (PLL)

techniques, the device uses an inexpensive external

13.5 MHz pullable crystal input to produce output

clocks of 13.5 MHz, 27 MHz, and 54 MHz .

The MK3720A is a drop-in replacement to the

earlier MK3720S.

Block Diagram

Features

• Packaged in 8 pin SOIC

• 3.3 V only operating voltage

• Output clocks of 54, 27, and 13.5MHz

• Uses an inexpensive 13.500 MHz external crystal

• On-chip patented VCXO with pull range

of 200ppm (minimum)

• VCXO tuning voltage of 0 to 3.3 V

• 12 mA output drive capability at TTL levels

• Advanced, low power, sub-micron CMOS process

• The A version is the latest, manufactured in a smaller

geometry process. The MK3720A gives a wider pull

range than the MK3720S, and so is recommended

for all new designs, and cost reductions of existing

designs.

VIN

13.5 MHz X1

pullable

crystal

X2

Voltage

Controlled

Crystal

Oscillator

PLL/Clock

Synthesis

Circuitry

Output

Buffer

Output

Buffer

Output

Buffer

54 MHz Clock

27 MHz Clock

13.5 MHz Clock

MDS 3720 D

1

Revision 053100

Printed 11/16/00

Integrated Circuit Systems, Inc. •525 Race Street • San Jose • CA• 95126• (408)295-9800tel • www.icst.com

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