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PDF P1822 Data sheet ( Hoja de datos )

Número de pieza P1822
Descripción (P1818 - P1822) Low Power Mobile VGA EMI Reduction IC
Fabricantes Alliance Semiconductor 
Logotipo Alliance Semiconductor Logotipo



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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.

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P1822 pdf
www.DataSheet4U.com
P1818/19/20/21/22
®
Absolute Maximum Ratings
Symbol
VDD, VIN
TSTG
TA
Parameter
Voltage on any pin with respect to GND
Storage temperature
Operating temperature
DC Electrical Characteristics
3.3 V, 25° C
Symbol
VIL
VIH
IIL
IIH
IXOL
IXOH
VOL
VOH
IDD
ICC
VDD
tON
ZOUT
Parameter
Input low voltage
Input high voltage
Input low current (inputs D_C,
PD#, MRS, FRS, SRS)
Input high current
XOUT output low current
(@ 0.4 V, VDD = 3.3 V)
XOUT output high current
(@ 2.5 V, VDD = 3.3 V)
Output low voltage
(VDD=3.3 V, IOL = 20 mA)
Output high voltage
(VDD=3.3 V, IOH = 20 mA)
Static supply current
Standby mode
Dynamic supply current
Normal mode (3.3 V and 25 pF
probe loading)
Operating voltage
Power up time
(first locked clock cycle after
power up)
Clock output impedance
Min
GND – 0.3
2.00
-60.0
2.00
7.1
fIN-min
Rating
-0.5 to +7.0
-65 to +125
0 to +70
Unit
V
ºC
ºC
Typ Max Unit
– 0.8 V
– VDD + 0.3 V
-20.00
µA
– 1.00 µA
12.00
mA
12.00
mA
– 0.4 V
– 2.8 V
4.5
3.3
0.18
26.9
fIN-max
mA
mA
V
mS
50 –
March 2003
Low Power Mobile VGA EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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