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P2681A

Description
General Purpose EMI Reduction IC
File Size472KB,10 Pages
ManufacturerALSC [Alliance Semiconductor Corporation]
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P2681A Overview

General Purpose EMI Reduction IC

October 2003
rev D
General Purpose EMI Reduction IC
Features
FCC approved method of EMI attenuation
Provides up to 15 dB of EMI suppression
Generates a
1 X
or
½ X
low EMI spread
spectrum clock of the input frequency
Output frequency from
6MHz
to
20MHz
Digital spread selections
Spreading ranges from +/-0.4% to +/-5.0%
Ultra low cycle-to-cycle jitter
Zero-cycle slip
3.3V and 5.0V operating voltage range
10 mA output drives
TTL or CMOS compatible outputs
Ultra-low power CMOS design
Available in 8 pin SOIC and TSSOP
Product Description
The P2681A is a versatile spread spectrum
frequency modulator designed specifically for digital
camera and other digital video and imaging
applications. The P2681A reduces electromagnetic
interference (EMI) at the clock source, which
provides system wide reduction of EMI of all clock
dependent signals. The P2681A allows significant
Block Diagram
P2681A
system cost savings by reducing the number of circuit
board layers and shielding that are traditionally
required to pass EMI regulations.
The P2681A uses the most efficient and optimized
modulation profile approved by the FCC.
The P2681A 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”.
Applications
The P2681A is targeted towards MFP, xDSL, fax
modem, set-top box, USB controller, DSC, and
embedded 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.

P2681A Related Products

P2681A P2681A-08TT P2681A-08TR P2681A-08ST P2681A-08SR
Description General Purpose EMI Reduction IC General Purpose EMI Reduction IC General Purpose EMI Reduction IC General Purpose EMI Reduction IC General Purpose EMI Reduction IC
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-8 TSSOP-8 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 - e0 e0 e0 e0
length - 4.4 mm 4.4 mm 4.92 mm 4.92 mm
Number of terminals - 8 8 8 8
Maximum operating temperature - 70 °C 70 °C 70 °C 70 °C
Maximum output clock frequency - 20 MHz 20 MHz 20 MHz 20 MHz
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - TSSOP TSSOP SOP SOP
Encapsulate equivalent code - TSSOP8,.25 TSSOP8,.25 SOP8,.25 SOP8,.25
Package shape - RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form - SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE SMALL OUTLINE
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 - 20 MHz 20 MHz 20 MHz 20 MHz
Certification status - Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height - 1.2 mm 1.2 mm 1.8 mm 1.8 mm
Maximum slew rate - 15 mA 15 mA 15 mA 15 mA
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 0.65 mm 1.27 mm 1.27 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 mm 3.95 mm 3.95 mm
uPs/uCs/peripheral integrated circuit type - CLOCK GENERATOR, OTHER CLOCK GENERATOR, OTHER CLOCK GENERATOR, OTHER CLOCK GENERATOR, OTHER
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