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PDF ASM3P2811B Data sheet ( Hoja de datos )
| Número de pieza | ASM3P2811B | |
| Descripción | (ASM3P281xA/B) Low Power EMI Reduction IC | |
| Fabricantes | Alliance Semiconductor Corporation | |
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September 2003
wrewvw.1D.a0taSheet4U.com
Low Power EMI Reduction IC
ASM3P2811A/B
ASM3P2812A/B
ASM3P2814A/B
Features
FCC approved method of EMI attenuation.
Provides up to 15dB EMI reduction.
Generates a 1X, 2X and 4X low EMI spread
spectrum clock of the input frequency.
o 1X: ASM3P2811A/B
o 2X: ASM3P2812A/B
o 4X: ASM3P2814A/B
Optimized for input frequency range from 10MHz
to 40 MHz.
o ASM3P2811A/B: 10 to 40MHz
o ASM3P2812A/B: 10 to 40MHz
o ASM3P2814A/B: 10 to 40MHz
Internal loop filter minimizes external components
and board space.
Selectable spread options: Down Spread and
Center Spread.
8 spread frequency deviation selections:
o ±0.625% to –3.5%
Low inherent cycle-to-cycle jitter.
3.3V operating voltage range.
CMOS/TTL compatible inputs and outputs.
Pinout compatible with Cypress CY25811,
CY25812 and CY25814.
Products are available for industrial temperature
range.
Available in 8-pin SOIC and TSSOP.
Product Description
The ASM3P28XX devices are versatile spread spectrum
frequency modulators designed specifically for a wide
range of input clock frequencies from 10MHz to 40MHz.
(Refer Input/Output Frequency Range Selection Table).
The ASM3P28XX can generate an EMI reduced clock
from crystal, ceramic resonator, or system clock. The
ASM3P28XX-A and the ASM3P28XX-B offer various
combinations of spread options and percentage
deviations (Refer Output Frequency Deviation and
Spread Option Selection Table). These combinations
include Down and Center Spread and percentage
deviation range from ±0.625% to –3.50%.
The ASM3P28XX reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of down stream clock and data dependent
signals. The ASM3P28XX 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 ASM3P28XX 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’.
The ASM3P28XX uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method.
Applications
The ASM3P28XX is targeted towards 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 • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com
Notice: The information in this document is subject to change without notice.
1 page  
September 2003
wrewvw.1D.a0taSheet4U.com
ASM3P2811A/B
ASM3P2812A/B
ASM3P2814A/B
DC Electrical Characteristics (3.3V, 25°C)
Symbol
Parameter
VIL
VIH
IIL
IIH
IXOL
IXOH
VOL
VOH
ICC
IDD
VDD
tON
ZOUT
Input low voltage
Input high voltage
Input low current
(inputs D_C, SRS and FRS)
Input high current
XOUT Output low current
(@ 0.4V, VDD = 3.3V)
XOUT Output high current
(@ 2.5V, VDD = 3.3V)
Output low voltage (VDD = 3.3V, IOL = 20mA)
Output high voltage (VDD = 3.3V, IOH = 20mA)
Dynamic supply current
Normal mode (3.3V and 25pF loading)
Static supply current
Standby mode
Operating voltage
Power up time (first locked clock cycle after power
up)
Clock out impedance
Min
GND – 0.3
-
-60.00
-
2.00
-
-
2.8
7.1 fIN - min
-
-
-
-
Typ
-
-
-
-
-
-
-
-
-
4.5
3.3
0.18
50
Max
Unit
0.8
VDD + 0.3
-20.00
V
V
µA
1.00
12.00
µA
mA
12.00
0.4
-
13.9 fIN - max
mA
V
V
mA
- mA
-V
- mS
-Ω
AC Electrical Characteristics
Symbol
Parameter
fIN Input frequency ASM3P2811/12/13/14 A/B
Output frequency for ASM3P211A/B
fOUT Output frequency for AS3P2812A/B
Output frequency for AS3P2814A/B
tLH* Output rise time (measured at 0.8V to 2.0V)
tHL* Output fall time (measured at 2.0V to 0.8V)
tJC Jitter (cycle to cycle)
TD Output duty cycle
* tLH and tHL are measured into a capacitive load of 15pF
Min Typ Max Unit
10
10
20
40
-
-
-200
45
- 40
- 40
- 80
- 160
0.69 -
0.66 -
- 200
50 55
MHz
MHz
MHz
MHz
ns
ns
ps
%
Low Power EMI Reduction IC
Notice: The information in this document is subject to change without notice.
5 of 6
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ASM3P2811B.PDF ] | |
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