April 2007
rev 0.2
Spread Spectrum Clock Generator
Features
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PCS3P2191A
output. PCS3P2191A offers seven selectable centre
spread options of ±0.5% to ±2.0%, and a no spread
option.
(Refer
Spread
reduces
Deviation
Selection
Table).
PCS3P2191A
electromagnetic
interference
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%
(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.
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3.3V ± 0.3V Operating Voltage
Commercial and Industrial temperature range
16-pin TSSOP Package
Advanced low power CMOS process
Product Description
PCS3P2191A is a versatile spread spectrum frequency
modulator that generates four low EMI 4x clocks at the
Application
PCS3P2191A is targetted for LCD panel application
Block Diagram
S2
S1
S0
VDD
2
PLL
Modulation
CLKIN / XIN
XOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
4
5
GND
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008
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Tel: 408-879-9077
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Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.