MK3721

Low Cost 3.3 Volt VCXO

MDS 3721 B

1

Revision 082800

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

I C R O

Block Diagram

Description

Features

The MK3721 is ICS/MicroClock’s lowest cost,

low jitter, high performance 3.3 volt VCXO

designed to replace expensive VCXO modules.

The 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

ICS/MicroClock’s patented VCXO techniques,

the device uses an inexpensive external pullable

crystal in the range of 16.2 - 28 MHz to produce a

VCXO output clock at that same frequency.

ICS/MicroClock manufactures the largest variety

of Set-Top Box and multimedia clock synthesizers

for all applications. If more clock outputs are

needed, see the MK3732 or MK377x family of

parts. Consult ICS/MicroClock to eliminate

VCXOs, crystals and oscillators from your board.

• Packaged in 8 pin SOIC

• 3.3 V operating voltage

• 16.2 MHz to 28 MHz operation

• Uses an inexpensive external crystal

• On-chip VCXO (patented) with pull range of

200 ppm (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

• For frequencies between 8 MHz to 16 MHz, use

the MK3711A. For frequencies between 1 MHz

and 8 MHz, use the MK3713. For higher than

28 MHz, use the MK3732-05

Voltage

Controlled

Crystal

Oscillator

16.2 -28 MHz

pullable crystal

X1

X2

VIN

Output

Buffer

16.2 - 28 MHz Clock

(REFOUT)