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MK3721

Part Number	MK3721
Manufacturer	Integrated Circuit Systems
Description	Low Cost 3.3 Volt VCXO
Published	May 7, 2005
Detailed Description	I C R O C LOC K Description The MK3721 is ICS/MicroClock’s lowest cost, low jitter, high performance 3.3 volt VCXO desig...
Datasheet	MK3721 PDF File

Overview

I C R O C LOC K Description 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.
MK3721 Low Cost 3.
3 Volt VCXO Features • 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 Block Diagram VIN X1 16.
2 -28 MHz pullable crystal X2 Voltage Controlled Crystal Oscillator Output Buffer 16.
2 - 28 MHz Clock (REFOUT) 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 C LOC K Pin Assignment MK3721 Low Cost 3.
3 Volt VCXO MK3721 X1 VDD VIN GND 1 2 3 4 8 7 6 5 X2 DC REFOUT (VCXO) DC 8 pin (150 mil) SOIC Pin Descriptions Number Name Description 1 X1 Crystal connection.
Connect to a pullable 16.
2 - 28 MHz crystal.
2 VDD VDD.
Connect to + 3.
3 V.
3 VIN Voltage input to VCXO.
Zero to 3.
3 V analog input which controls the frequency of the VCXO.
4 GND Connect to ground.
5 DC Don't Connect anything to ...

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