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Alliance Semiconductor
Alliance Semiconductor

P1820 Datasheet Preview

P1820 Datasheet

(P1818 - P1822) Low Power Mobile VGA EMI Reduction IC

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Production
March 2003
® P1818/19/20/21/22
Low Power Mobile VGA EMI Reduction IC
Features
• FCC approved method of EMI attenuation
• Provides up to 15 dB EMI reduction
• Generates a low EMI spread spectrum clock and a
non-spread reference clock of the input frequency
• Optimized for frequency range from 10 MHz to 160
MHz
P1818: 10 to 20 MHz
P1819: 20 to 40 MHz
P1820: 40 to 80 MHz
P1821: 10 to 40 MHz
P1822: 80 to 160 MHz
• Internal loop filter minimizes external components
and board space
• Selectable spread options: Down Spread and Cen-
ter Spread
• Low inherent cycle-to-cycle jitter
• Eight spread % selections: +/-0.625% to –3.5%
• 3.3V operating voltage
• CMOS/TTL compatible inputs and outputs
• Low power CMOS design
• Supports notebook VGA and other LCD timing
controller applications
• Power down function for mobile application
• Products are available for industrial temperature
range.
• Available in 8-pin SOIC and TSSOP
Product Description
The P18xx is a versatile spread spectrum frequency
modulator designed specifically for a wide range of input
clock frequencies from 10 to 160 MHz (see Input Fre-
quency and Modulation Rate Selections). The P18xx
can generate an EMI reduced clock from crystal,
ceramic resonator, or system clock. The P18xx-A to
P18xx-H offer various combinations of spread options
and percentage deviations (see Spread Deviation Selec-
tions). These combinations include Down Spread,
Center Spread and percentage deviation range from
±0.625% to -3.50%.
The P18xx reduces electromagnetic interference (EMI)
at the clock source, allowing a system wide EMI
reduction for all the down stream clocks and data
dependent signals. The P18xx 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 P18xx modulates the output of a single PLL in
order to “spread” the bandwidth of a synthesized clock,
thereby decreasing 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 clock generators.
Lowering EMI by increasing a signal’s bandwidth is
called “spread spectrum clock generation”.
The P18xx uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented by using a proprietary all-digital method.
Applications
The P18xx is targeted toward EMI management for
memory and LVDS interfaces in mobile graphic
chipsets and high-speed digital applications such as
PC peripheral devices, consumer electronics, and
embedded controller systems.
Alliance Semiconductor
2575 Augustine Drive • Santa Clara, CA 95054 • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com
Notice: The information in this document is subject to change without notice.



Alliance Semiconductor
Alliance Semiconductor

P1820 Datasheet Preview

P1820 Datasheet

(P1818 - P1822) Low Power Mobile VGA EMI Reduction IC

No Preview Available !

P1820 pdf
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Pin Diagrams
P1818/19/20/21/22
®
X IN 1
8 XOUT
VSS 2
7 VDD
SRS 3
6 PD#
P 1 8 1 8 A /B /C /D
M o d O u t 4 P 1 8 1 9 A /B /C /D
P 1 8 2 0 A /B /C /D
5
REF
X IN 1
8 XOUT
VSS 2
7 VDD
SRS 3
6 FRS
M odOut 4
5 REF
P 1 8 2 1 A /B /C /D
X IN 1
VSS 2
D_C
M odO ut
3
P 1 8 1 8 E /F /G /H
4 P 1 8 1 9 E /F /G /H
P 1 8 2 0 E /F /G /H
8 XOUT
7 VDD
6 PD#
5 REF
X IN 1
VSS 2
SRS 3
M odOut 4
P1822A
8 MRS
7 VDD
6 SSON#
5 SR0
Block Diagram
D_C PD# MRS FRS SRS
VDD
XIN
XOUT
Crystal
Oscillator
REF
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
P1818/19/20/21/22 Block Diagram
VSS
March 2003
Low Power Mobile VGA EMI Reduction IC
Notice: The information in this document is subject to change without notice.
2 of 8


Part Number P1820
Description (P1818 - P1822) Low Power Mobile VGA EMI Reduction IC
Maker Alliance Semiconductor
Total Page 8 Pages
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