PRELIMINARY INFORMATION
ICS3726-12
H
IGH
P
ERFORMANCE
VCXO
Description
The ICS3726-12 is a low cost, low-jitter,
high-performance 3.3 volt VCXO designed to replace
expensive discrete VCXOs modules. The ICS3726-12
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. 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
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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
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
VDD
VIN
X1
20 to 52 MHz
Pullable Crystal
X2
Voltage
Controlled
Crystal
Oscillator
20 to 52 MHz
Clock (REFOUT)
Optional tuning
crystal capacitors
GND
MDS 3726-12 B
I n t e gra te d C i r c u i t S y s t e m s
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1
525 Race Stre et, San Jo se, CA 9 5126
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Revision 120505
te l (40 8) 2 97-12 01
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w w w. i c st . c o m
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
