PCS3P2189A_1 Datasheet, PDF (1/7 Pages) PulseCore Semiconductor – Spread Spectrum Clock Generator

May 2008
rev 0.2
Spread Spectrum Clock Generator
PCS3P2189A
Features
• Generates a 4X low EMI spread spectrum clock of
the input frequency.
• Input frequency: 10MHz - 25MHz
• Output frequency: 40MHz - 100MHz
• Internal loop filter minimizes external components
and board space.
• Selectable Centre Spread frequency deviation:
±0.5%, ± 1.0%, ± 1.5%, ± 2.0%
• Supply Voltage :3.3V ± 0.3V
• Commercial and Industrial temperature range
• 8-pin TSSOP Package
• Low power CMOS process
Product Description
PCS3P2189A is a versatile spread spectrum frequency
modulator that generates a low EMI 4x clock at the
output. PCS3P2189A offers four selectable centre
spread options of ±0.5%,±1.0%,±1.5%,±2.0%,(Refer
Spread Deviation Selection Tabnle). PCS3P2189A
reduces electromagnetic interference (EMI) at the clock
source, allowing system wide reduction of EMI of all
clock dependent signals. The PCS3P2189A allows
significant system cost savings by reducing the number
of circuit board layers, ferrite beads, and shielding that
are traditionally required to pass EMI regulations.
PCS3P2189A has spread spectrum ON/OFF option.
The PCS3P2189A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
Application
PCS3P2189A is targetted for LCD panel application
Block Diagram
CLKIN / XIN
XOUT
Crystal
Oscillator
S0 S1 ^SSON _VDD
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
VSS
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: [phone] • Fax: [phone]
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.