ICS3726-02 Datasheet, PDF (1/6 Pages) Integrated Circuit Systems – HIGH PERFORMANCE VCXO

PRELIMINARY INFORMATION
ICS3726-02
HIGH PERFORMANCE VCXO
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
VIN
X1
20 to 52 MHz
Pullable Crystal
X2
Optional tuning
crystal capacitors
VDD
Voltage
Controlled
Crystal
Oscillator
GND
OE
20 to 52 MHz
Clock (REFOUT)
MDS 3726-02 B
1
Revision 120505
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel [phone] ● www.icst.com