PCS3P2042B Datasheet, PDF (1/7 Pages) ON Semiconductor – LCD Panel EMI Reduction IC

PCS3P2042B
LCD Panel EMI Reduction IC
Features
• FCC approved method of EMI attenuation.
• Provides up to 15dB of EMI suppression.
• Generates a low EMI spread spectrum clock of the
input frequency.
• Input frequency range: 30MHz - 110MHz.
• Output frequency range: 30MHz - 110MHz
• Optimized for 32.5MHz, 54MHz, 65MHz, 74MHz and
108MHz pixel clock frequencies.
• Internal loop filter minimizes external components and
board space.
• Eight selectable high spread ranges up to ±2%.
• Selectable spread options: Down Spread and Center
Spread
• SSON# control pin for spread spectrum enable and
disable options.
• Low cycle-to-cycle jitter.
• 3.3V ± 0.3V operating range.
• CMOS design.
• Supports most mobile graphic accelerator and LCD
timing controller specifications.
• Available in 8-pin TSSOP Package.
Product Description
The PCS3P2042B is a versatile spread spectrum
frequency modulator designed specifically for digital flat
panel applications. The PCS3P2042B reduces
electromagnetic interference (EMI) at the clock source,
allowing system wide reduction of EMI of down stream
clock and data dependent signals. The PCS3P2042B
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 PCS3P2042B uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The PCS3P2042B modulates the output of a single PLL in
order to “spread” the bandwidth of a synthesized clock,
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.’
Applications
The PCS3P2042B is targeted towards digital flat panel
applications for notebook PCs, palm-size PCs, office
automation equipments and LCD monitors.
Block Diagram
SR0 CP1 CP0 SSON#
VDD
CLKIN
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
©2010 SCILLC. All rights reserved.
JANUARY 2010 – Rev. 2
VSS
Publication Order Number:
PCS3P2042/D