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  ON Semiconductor Electronic Components Datasheet  

PCS3P25811 Datasheet

Spread Spectrum Clock Generator

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PCS3P25811 and PCS3P25812 and PCS3P25814
Spread Spectrum Clock
Generator
Features
Generates a 1x (PCS3P25811), 2x (PCS3P25812)
and 4x(PCS3P25814) low EMI spread spectrum
clock of the input frequency
Provides up to 15dB of EMI suppression
Input Frequency: 4MHz - 32MHz
Output Frequency:
PCS3P25811: 4MHz - 32MHz
PCS3P25812: 8MHz - 64MHz
PCS3P25814: 16MHz - 128MHz
Selectable spread options: Down Spread and Center
Spread
Low Power Dissipation:
3.3V: 20mW (typ) @ 6MHz
3.3V: 24mW (typ) @ 12MHz
3.3V: 30mW (typ) @ 24MHz
Low inherent Cycle-to-Cycle Jitter
Supply Voltage: 2.8V to 3.6V
LVCMOS Input and output
Functional and Pinout compatible to Cypress
CY25811, CY25812 and CY25814
8-pin SOIC, and 8L 2mmX2mm WDFN (TDFN)
Packages
Product Description
The PCS3P25811/12/14 devices are versatile spread
spectrum frequency modulators designed specifically for
a wide range of input clock frequencies from 4MHz to
32MHz.
The PCS3P25811/12/14 reduce electromagnetic
interference (EMI) at the clock source, allowing system
wide reduction of EMI of down stream clock and data
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dependent signals. It allows significant system cost
savings by reducing the number of circuit board layers,
ferrite beads, shielding, and other passive components
that are traditionally required to pass EMI regulations.
The PCS3P25811/12/14 can generate an EMI reduced
clock from crystal, ceramic resonator, or system clock.
The PCS3P25811/12/14 modulate the output of a single
PLL in order to “spread” the bandwidth of a synthesized
cock, and more importantly, decreases the peak
amplitudes of its harmonics. This results in significantly
lower system EMI compared to the typical narrow band
signal produced by oscillators and most frequency
generators. Lowering EMI by increasing a signal’s
bandwidth is called ‘spread spectrum clock generation.’
The PCS3P25811/12/14 use the most efficient and
optimized modulation profile approved by the FCC and is
implemented in a proprietary all-digital method.
The PCS3P25811/12/14 have 2 pins S0 and S1 to control
the selection of Center Spread, Down Spread and No-
Spread functions. Additionally there is a 3 level logic
contol FSEL, for selecting one of the three different
frequency ranges within the operating frequency range.
Refer Input/Output Frequency Range Selection Table.
The PCS3P25811/12/14 operate from a 2.8V to 3.6V
supply and are available in 8 pin SOIC, and 8L
2mmX2mm WDFN packages.
Applications
The PCS3P25811/12/14 are targeted towards EMI
management in applications such as LCD Panels, MFPs,
Digital copiers, Networking, PC peripheral devices,
consumer electronics, and embedded controller systems.
©2010 SCILLC. All rights reserved.
JANUARY 2010 – Rev. 1
Publication Order Number:
PCS3P25811/D


  ON Semiconductor Electronic Components Datasheet  

PCS3P25811 Datasheet

Spread Spectrum Clock Generator

No Preview Available !

Block Diagram
XIN / CLKIN
XOUT
Crystal
Oscillator
PCS3P25811 and PCS3P25812 and PCS3P25814
FSEL S1 S0
VDD
Frequency
Divider
Feedback
Divide
r
Input Decoder
& Modulation
control
Phase
Detector
Loop
Filter
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PLL
VCO
Output
Divider
ModOUT
Pin Configuration
Pin Description
Pin# Pin Name
1 XIN / CLKIN
2 VSS
3 S1
4 S0
5 ModOUT
6 FSEL
7 VDD
8 XOUT
VSS
XIN / CLKIN 1
8 XOUT
VSS 2
S1 3
PCS3P25811
PCS3P25812
PCS3P25814
7 VDD
6 FSEL
S0 4
5 ModOUT
Type
Description
I Crystal connection or External Clock input.
P Ground to entire chip.
I
Digital 3 level logic input (1-M-0) used to select Center, Down and No spread
options. (Refer to Frequency Deviation Selection Table). Default=M.
I
Digital 3 level logic input (1-M-0) used to select Center, Down and No spread
options. (Refer to Frequency Deviation Selection Table). Default=M.
O Spread Spectrum Clock Output.
Frequency range select. Digital 3 level logic input (1-M-0) used to select Input
I Clock frequency range (Refer to Input/Output Frequency Range Selection Table).
Default=M.
P Power supply for the entire chip (2.8V to 3.6V).
Crystal connection. If using an external reference, this pin must be left
O unconnected.
Rev. 1 | Page 2 of 9 | www.onsemi.com


Part Number PCS3P25811
Description Spread Spectrum Clock Generator
Maker ON Semiconductor
PDF Download

PCS3P25811 Datasheet PDF






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