PCS3P2191A_1 Datasheet, PDF (1/8 Pages) PulseCore Semiconductor – Spread Spectrum Clock Generator

April 2007
rev 0.2
Spread Spectrum Clock Generator
PCS3P2191A
Features
• Generates four 4X low EMI spread spectrum clocks
• Input frequency: 15MHz
• Output frequency: 60MHz
• Internal loop filter minimizes external components
and board space
• Selectable Centre Spread frequency deviation:
±0.5%, ±0.75%, ± 1.0%,
± 1.25%, ± 1.5%, ± 1.75% ± 2.0%
• 3.3V ± 0.3V Operating Voltage
• Commercial and Industrial temperature range
• 16-pin TSSOP Package
• Advanced low power CMOS process
output. PCS3P2191A offers seven selectable centre
spread options of ±0.5% to ±2.0%, and a no spread
option. (Refer Spread Deviation Selection Table).
PCS3P2191A reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of all clock dependent signals. The PCS3P2191A
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. The PCS3P2191A uses the most efficient
and optimized modulation profile approved by the FCC
and is implemented in a proprietary all digital method.
The Device is available in 16 Pin TSSOP package, in
Commercial and Industrial temperature range.
Product Description
Application
PCS3P2191A is a versatile spread spectrum frequency
modulator that generates four low EMI 4x clocks at the
PCS3P2191A is targetted for LCD panel application
Block Diagram
S2 S1 ^S0
VDD
2
CLKIN / XIN
XOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
4
5
GND
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.