December 2003
rev 1.0
P2040C
LCD Panel EMI Reduction IC
Product Description
Features
FCC approved method of EMI attenuation.
The P2040C is a selectable spread spectrum frequency
modulator designed specifically for digital flat panel
applications. The P2040C reduces electromagnetic
interference (EMI) at the clock source which provides
system wide reduction of EMI of all clock dependent
signals. The P2040C allows significant system cost
savings by reducing the number of circuit board layers
and shielding that are traditionally required to pass EMI
regulations.
Provides up to 15 dB of EMI suppression
Generates a low EMI spread spectrum clock of the
input frequency
50 MHz to 170 MHz input frequency range
Optimized for 54MHz, 65MHz, 81MHz, 140MHz,
and 162MHz pixel clock frequencies
Internal loop filter minimizes external components
and board space
8 selectable spread ranges, up to +/- 2.2%
SSON# control pin for spread spectrum enable
and disable options
The P2040C uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method.
2 selectable modulation rates
Low cycle-to-cycle jitter
3.3V operating voltage
16 mA output drives
TTL or CMOS compatible outputs
Ultra low power CMOS design
Supports most mobile graphic accelerator and
LCD timing controller specifications
Available in 8 pin SOIC and TSSOP
The P2040C 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 P2040C is targeted towards digital flat panel
applications for Notebook PCs, Palm-size PCs,
Office Automation Equipments, and LCD Monitors.
Alliance Semiconductor
2575, Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com
Notice: The information in this document is subject to change without notice.
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
