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Alliance Semiconductor

P2040C Datasheet Preview

P2040C Datasheet

LCD Panel EMI Reduction IC

No Preview Available !

September 2005
P2040C
rev 1.4
LCD Panel EMI Reduction IC
Features
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FCC approved method of EMI attenuation.
Provides up to 15dB of EMI suppression
Generates a low EMI spread spectrum clock of the
input frequency
50MHz to 170MHz 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
2 selectable modulation rates
Low Cycle-to-cycle jitter
3.3V Operating Voltage
Ultra low power CMOS design
Supports most mobile graphic accelerator and LCD
timing controller specifications
Available in 8 pin SOIC and TSSOP Packages
Product Description
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.
The P2040C uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method. 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 result in a 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 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
The P2040C is targeted towards digital flat panel
applications for Notebook PCs, Palm-size PCs, Office
Automation Equipments and LCD Monitors.
Block Diagram
SR0 SR1 MRA SSON#
VDD
CLKIN
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
VSS
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.




Alliance Semiconductor

P2040C Datasheet Preview

P2040C Datasheet

LCD Panel EMI Reduction IC

No Preview Available !

September 2005
rev 1.4
Pin Configuration
CLKIN 1
MRA 2
SR1 3
VSS 4
8 VDD
P2040C
7 SR0
6 ModOUT
5 SSON#
P2040C
Pin Description
Pin#
1
2
3
4
5
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6
7
8
Pin
Name
CLKIN
MRA
SR1
VSS
SSON#
ModOUT
SR0
VDD
Type
Description
I External reference frequency input. Connect to externally generated reference signal.
I Digital logic input used to select modulation rate. This pin has an internal pull-up resistor.
I Digital logic input used to select Spreading Range. This pin has an internal pull-up resistor.
P Ground to entire chip. Connect to system ground.
I
Digital logic input used to enable Spread Spectrum function (Active LOW). Spread Spectrum
function enabled when LOW, disabled when HIGH. This pin has an internal pull-low resistor.
O Spread spectrum Clock Output.
I Digital logic input used to select Spreading Range. This pin has an internal pull-up resistor.
P Power supply for the entire chip.
Modulation Selection (Commercial) – Table 1
MRA SR1 SR0
0 00
0 01
0 10
0 11
1 00
1 01
1 10
1 11
54MHz
±1.4%
±2.0%
±1.1%
±1.8%
±1.3%
±2.2%
±1.4%
±2.1%
Spreading Range
65MHz 81MHz 140MHz
±1.2%
±1.0%
±0.6%
±1.9%
±1.6%
±1.0%
±0.9%
±0.5%
±0.3%
±1.5%
±1.0%
±0.54%
±1.3%
±1.3%
±1.25%
±2.1%
±2.1%
±2.0%
±1.3%
±1.4%
±1.2%
±2.1%
±2.1%
±1.9%
162MHz
±0.4%
±0.8%
±0.3%
±0.4%
±1.1%
±1.8%
±0.9%
±1.4%
Modulation Rate
(Fin/80) * 62.49KHz
(Fin/80) * 62.49KHz
(Fin/80) * 62.49KHz
(Fin/80) * 62.49KHz
(Fin/80) * 20.83KHz
(Fin/80) * 20.83KHz
(Fin/80) * 20.83KHz
(Fin/80) * 20.83KHz
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
2 of 9


Part Number P2040C
Description LCD Panel EMI Reduction IC
Maker Alliance Semiconductor
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P2040C Datasheet PDF






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