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ASM3P2190A

Description
Peak Reducing EMI Solution
File Size115KB,7 Pages
ManufacturerALSC [Alliance Semiconductor Corporation]
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ASM3P2190A Overview

Peak Reducing EMI Solution

November 2003
rev 1.0
ASM3P2190A
Peak Reducing EMI Solution
Features
Generates an EMI optimized clocking
signal at the output.
Selectable output frequency range.
Single 1.25% or 2.4% down spread
output.
Integrated loop filter components.
Operates with a 3.3V supply.
Low-power CMOS design.
Available in 8-pin SOIC and 8-pin
TSSOP packages.
Key Specifications
Description
Supply voltages
Frequency range
Cycle-to-cycle jitter
Selectable spread percentage
Output duty cycle
Output rise and fall time
Specification
V
DD
= 3.3V ± 5%
6 MHz
30 MHz
325 ps (typical)
-1.25% or –2.4%
40/60% (worst case)
5ns (maximum)
Product Description
The ASM3P2190A is a versatile spread spectrum
frequency modulator designed specifically for a
wide range of clock frequencies. The
ASM3P2190A
reduces
electromagnetic
interference (EMI) at the clock source, allowing
system wide reduction of EMI of down stream
clock and data dependent signals. The
ASM3P2190A allows significant system cost
savings by reducing the number of circuit board
layers and shielding that are traditionally required
to pass EMI regulations.
The ASM3P2190A 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 ASM3P2190A uses the most efficient and
optimized modulation profile approved by the
FCC and is implemented by using a proprietary
all-digital method.
Simplified Block Diagram
3.3V
X1
X2
Spread spectrum output
(EMI suppressed)
Pin Diagram
CLKIN / X1
NC / X2
GND
SS%
1
2
8
7
NC
FS1
VDD
CLKOUT
Applications
The ASM3P2190A is targeted towards notebook
LCD displays, other displays using an LVDS
interface, PC peripheral devices and embedded
systems.
ASM3P2190A
3
4
6
5
Alliance Semiconductor
2595, 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.

ASM3P2190A Related Products

ASM3P2190A ASM3P2190A-08TR ASM3P2190A-08SR ASM3P2190A-08ST ASM3P2190A-08TT
Description Peak Reducing EMI Solution Peak Reducing EMI Solution Peak Reducing EMI Solution Peak Reducing EMI Solution Peak Reducing EMI Solution
Is it Rohs certified? - incompatible incompatible incompatible incompatible
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 - TSSOP, TSSOP8,.25 SOP, SOP8,.25 SOP, SOP8,.25 TSSOP, TSSOP8,.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 - e0 e0 e0 e0
length - 4.4 mm 4.92 mm 4.92 mm 4.4 mm
Number of terminals - 8 8 8 8
Maximum operating temperature - 70 °C 70 °C 70 °C 70 °C
Maximum output clock frequency - 30 MHz 30 MHz 30 MHz 30 MHz
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - TSSOP SOP SOP TSSOP
Encapsulate equivalent code - TSSOP8,.25 SOP8,.25 SOP8,.25 TSSOP8,.25
Package shape - RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form - SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius) - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
power supply - 3.3 V 3.3 V 3.3 V 3.3 V
Master clock/crystal nominal frequency - 30 MHz 30 MHz 30 MHz 30 MHz
Certification status - Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height - 1.1 mm 1.8 mm 1.8 mm 1.1 mm
Maximum slew rate - 35 mA 35 mA 35 mA 35 mA
Maximum supply voltage - 3.7 V 3.7 V 3.7 V 3.7 V
Minimum supply voltage - 2.8 V 2.8 V 2.8 V 2.8 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 - COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL
Terminal surface - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - GULL WING GULL WING GULL WING GULL WING
Terminal pitch - 0.65 mm 1.27 mm 1.27 mm 0.65 mm
Terminal location - DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
width - 3 mm 3.95 mm 3.95 mm 3 mm
uPs/uCs/peripheral integrated circuit type - CLOCK GENERATOR, OTHER CLOCK GENERATOR, OTHER CLOCK GENERATOR, OTHER CLOCK GENERATOR, OTHER
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