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PulseCore Semiconductor

PCS3I2189A Datasheet Preview

PCS3I2189A Datasheet

Spread Spectrum Clock Generator

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May 2008
PCS3P2189A
rev 0.2
Spread Spectrum Clock Generator
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
www.DataSheet4U.com
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: 408-879-9077 Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.




PulseCore Semiconductor

PCS3I2189A Datasheet Preview

PCS3I2189A Datasheet

Spread Spectrum Clock Generator

No Preview Available !

May 2008
rev 0.2
Pin Configuration
PCS3P2189A
www.DataSheet4U.com
Pin Description
Pin#
1
2
Pin Name
CLKIN / XIN
XOUT
3 SSON
4 S1
5 S0
6 VSS
7 ModOUT
8 VDD
CLKIN / XIN 1
8 VDD
XOUT 2
SSON 3
PCS3P2189A
7 ModOUT
6 VSS
S1 4
5 S0
Type
I
O
I
I
O
P
O
P
Description
Crystal connection or External reference Clock Input
Crystal connection. If using an external reference, this pin must be left
unconnected.
Modulation enables pin. When HIGH enables spread spectrum modulation. Has an
Internal pull up resistor
Spread range select. Digital logic input used to select frequency deviation
(Refer Spread Deviation Table). This pin has an internal pull-up resistor.
Spread range select. Digital logic input used to select frequency deviation
(Refer Spread Deviation Table). This pin has an internal pull-up resistor.
Ground Connection. Connect to system ground.
Low EMI 4x clock output.
Power Supply Voltage Pin. Connect to +3.3V.
Spread Deviation Selection Table
(For an Input CLK=15MHz)
S1 S0
00
01
10
11
Deviation (± %)
0.5
1.0
1.5
2.0
Modulation Enable Setting Table
SSON
L
H
Modulation
No Modulation
Modulation
Spread Spectrum Clock Generator
Notice: The information in this document is subject to change without notice.
2 of 7


Part Number PCS3I2189A
Description Spread Spectrum Clock Generator
Maker PulseCore Semiconductor
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