
MDS 3726-02 B
1
Revision 120505
Integrated Circuit Systems
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525 Race Street, San Jose, CA 95126
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tel (408) 297-1201
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www.icst.com
H
IGH
P
ERFORMANCE
VCXO
ICS3726-02
PRELIMINARY INFORMATION
Description
The ICS3726-02 is a low cost, low-jitter,
high-performance 3.3 volt VCXO designed to replace
expensive discrete VCXOs modules. The ICS3726-02
offers a wider operating frequency range and improved
power supply noise rejection. The on-chip Voltage
Controlled Crystal Oscillator accepts a 0 to 3.3 V input
voltage to cause the output clocks to vary by ±200 ppm.
Using ICS’ patented VCXO techniques, the device
uses an inexpensive external pullable crystal in the
range of 20 to 52 MHz to produce a VCXO output clock
at that same frequency.
This part is ideal for Set-Top Box, multimedia clock
synthesizers and ADSL/VDSL applications.
The frequency of the on-chip VCXO is adjusted by an
external control voltage input into pin VIN. Because
VIN is a high-impedance input, it can be driven directly
from an PWM RC integrator circuit. Frequency output
increases with VIN voltage input. The usable range of
VIN is 0 to VDD.
Features
Packaged in 8-pin SOIC
Operational frequency range of 20 MHz to 52 MHz
Uses an inexpensive external crystal
On-chip patented VCXO with pull range of 400 ppm
VCXO tuning voltage of 0 to VDD
Output Enable control
Operating voltage of 3.3 V
12 mA output drive capability at TTL levels
Works with surface mount crystal with CL=10 pF
Advanced, low-power, sub-micron CMOS process
Available in Pb (lead) free package
Block Diagram
X1
X2
Voltage
Controlled
Crystal
Oscillator
VIN
20 to 52 MHz
Pullable Crystal
20 to 52 MHz
Clock (REFOUT)
GND
VDD
Optional tuning
crystal capacitors
OE