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P2041A Datasheet, PDF (1/9 Pages) Alliance Semiconductor Corporation – Versatile EMI Reduction IC | |||
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November 2003
P2041A
rev F
Versatile EMI Reduction IC
Features
 FCC approved method of EMI attenuation
 Provides up to 20 dB of EMI suppression
 Generates a low EMI spread spectrum clock
of the input frequency
 Optimized for 25 MHz to 60MHz input
frequency range
 Internal loop filter minimizes external
components and board space
 4 selectable spread ranges
 SSON control pin for spread spectrum
enable and disable options
 Characterizes to work with EMI-Lator®, EMC
simulation program.
 Low cycle-to-cycle jitter
 3.3 V or 5.0 V operating range
 16 mA output drives
 TTL or CMOS compatible outputs
 Low power CMOS design
 Available in 8 pin SOIC and TSSOP
the clock source which provides system wide
reduction of EMI of all clock dependent signals. The
P2041 allows significant system cost savings by
reducing the number of circuit board layers and
shielding that are traditionally required to pass EMI
regulations.
The P2041 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method.
The P2041 modulates the output of a single PLL in
order to âspreadâ 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 signalâs bandwidth is called âspread
spectrum clock generationâ.
Product Description
The P2041 is a selectable spread spectrum
frequency modulator designed specifically for PC
peripheral and embedded controller markets .The
P2041 reduces electromagnetic interference (EMI) at
Block Diagram
Applications
The P2041 is targeted towards the embedded
controller market and PC peripheral markets
including scanners, MFPâs, printers, PDA, IA , and
GPS devices.
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.
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