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ASM3P2111B

Description
Peak EMI Reducing Solution
File Size206KB,8 Pages
ManufacturerALSC [Alliance Semiconductor Corporation]
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ASM3P2111B Overview

Peak EMI Reducing Solution

May 2005
rev 0.1
Peak EMI Reducing Solution
Features
Generates an EMI optimized clock at the output.
Input frequency: 25 MHz.
Frequency outputs:
o
o
o
60 MHz (unmodulated)
2 x 48 MHz (unmodulated)
66.6 MHz (modulated): -1.7% down spread
ASM3P2111B
allows significant system cost savings by reducing the
number of circuit board layers and shielding that are
required to pass EMI regulations. The ASM3P2111B
modulates the output of 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.
Modulation rate: 30 KHz.
Supply voltage range: 3.3V ± 0.3V.
Available in 8-pin SOIC Package.
Commercial and Industrial Temperature range.
RoHS Compliant
Applications
ASM3P2111B is targeted towards EMI management for
Product Description
The ASM3P2111B is a versatile spread spectrum
frequency
modulator
that
reduces
electromagnetic
interference (EMI) at the clock source. The ASM3P2111B
high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Block Diagram
V
DD
XIN /CLKIN
XOUT
60 MHz
Crystal
Oscillator
PLL1
48 MHz_1
48 MHz_2
48 MHz_1
PLL2
66.6 MHz
Modulated
V
SS
Alliance Semiconductor
2575 Augustine Drive
Santa Clara CA
Tel: 408-855-4900
Fax: 408-855-4999
www.alsc.com

ASM3P2111B Related Products

ASM3P2111B ASM3I2111BG-08SR ASM3I2111BG-08ST ASM3P2111BG-08SR ASM3P2111BG-08ST
Description Peak EMI Reducing Solution Peak EMI Reducing Solution Peak EMI Reducing Solution Peak EMI Reducing Solution Peak EMI Reducing Solution
Is it Rohs certified? - conform to conform to conform to conform to
Maker - ALSC [Alliance Semiconductor Corporation] ALSC [Alliance Semiconductor Corporation] ALSC [Alliance Semiconductor Corporation] ALSC [Alliance Semiconductor Corporation]
Parts packaging code - SOIC SOIC SOIC SOIC
package instruction - SOP, SOP8,.25 SOP, SOP8,.25 SOP, SOP8,.25 SOP, SOP8,.25
Contacts - 8 8 8 8
Reach Compliance Code - unknow unknow unknow unknow
ECCN code - EAR99 EAR99 EAR99 EAR99
JESD-30 code - R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8
JESD-609 code - e3 e3 e3 e3
length - 4.9 mm 4.9 mm 4.9 mm 4.9 mm
Number of terminals - 8 8 8 8
Maximum operating temperature - 85 °C 85 °C 70 °C 70 °C
Maximum output clock frequency - 66.6 MHz 66.6 MHz 66.6 MHz 66.6 MHz
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - SOP SOP SOP SOP
Encapsulate equivalent code - SOP8,.25 SOP8,.25 SOP8,.25 SOP8,.25
Package shape - RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form - SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) - 250 250 250 250
power supply - 3.3 V 3.3 V 3.3 V 3.3 V
Master clock/crystal nominal frequency - 25 MHz 25 MHz 25 MHz 25 MHz
Certification status - Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height - 1.75 mm 1.75 mm 1.75 mm 1.75 mm
Maximum slew rate - 62 mA 62 mA 62 mA 62 mA
Maximum supply voltage - 3.6 V 3.6 V 3.6 V 3.6 V
Minimum supply voltage - 3 V 3 V 3 V 3 V
Nominal supply voltage - 3.3 V 3.3 V 3.3 V 3.3 V
surface mount - YES YES YES YES
technology - CMOS CMOS CMOS CMOS
Temperature level - INDUSTRIAL INDUSTRIAL COMMERCIAL COMMERCIAL
Terminal surface - MATTE TIN MATTE TIN MATTE TIN MATTE TIN
Terminal form - GULL WING GULL WING GULL WING GULL WING
Terminal pitch - 1.27 mm 1.27 mm 1.27 mm 1.27 mm
Terminal location - DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature - 40 40 40 40
width - 3.91 mm 3.91 mm 3.91 mm 3.91 mm
uPs/uCs/peripheral integrated circuit type - CLOCK GENERATOR, OTHER CLOCK GENERATOR, OTHER CLOCK GENERATOR, OTHER CLOCK GENERATOR, OTHER

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