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Alliance Semiconductor Corporation
Alliance Semiconductor Corporation

ASM3P2821B Datasheet Preview

ASM3P2821B Datasheet

Low Power EMI Reduction IC

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ASM3P2821B pdf
October 2003
wrewwv.D1a.t0aSheet4U.com
Features
FCC approved method of EMI attenuation.
Generates a 1X low EMI spread spectrum clock of
the input frequency.
Input frequency range: 15MHz – 27MHz.
Internal loop filter minimizes external components
and board space.
Frequency deviation: -2.5%
Low inherent cycle-to-cycle jitter.
3.3V operating voltage.
TTL or CMOS compatible inputs and outputs.
Ultra-low power CMOS design.
o TBD mA @ 3.3V, 24MHz
Pinout compatible with Cypress CY25811.
Products are available for industrial temperature
range.
Available in 8-pin SOIC and TSSOP.
Product Description
The ASM3P2821B is a versatile spread spectrum
frequency modulator designed specifically for input clock
frequencies in the range of 15MHz - 27MHz. The
ASM3P2821B can generate an EMI reduced clock from a
ceramic resonator or system clock. The ASM3P2821B
offers a percentage deviation of –2.5%.
ASM3P2821B
The ASM3P2821B reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of down stream clock and data dependent
signals. The ASM3P2821B 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 ASM3P2821B uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The ASM3P2821B 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 ASM3P2821B is targeted towards EMI management
for high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Block Diagram
XIN Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
VDD
PLL
Loop
Filter
VCO
Output
Divider
MODOUT
VSS
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.



Alliance Semiconductor Corporation
Alliance Semiconductor Corporation

ASM3P2821B Datasheet Preview

ASM3P2821B Datasheet

Low Power EMI Reduction IC

No Preview Available !

ASM3P2821B pdf
www.DataSheet4U.com
Pin Configuration
Pin Description
Pin#
1
2
3
4
5
6
7
8
Pin Name
XIN
VSS
NC
NC
MODOUT
NC
VDD
NC
XIN 1
8 NC
VSS 2
NC 3
ASM3P2821B
7 VDD
6 NC
NC 4
5 ModOUT
Type
I
P
O
P
Description
External reference clock input.
Ground to entire chip.
No Connect.
No Connect.
Spread spectrum low EMI output.
No Connect.
Power supply for the entire chip (3.3V).
No Connect.
ASM3P2821B
Low Power EMI Reduction IC
Notice: The information in this document is subject to change without notice.
2 of 7


Part Number ASM3P2821B
Description Low Power EMI Reduction IC
Maker Alliance Semiconductor Corporation
Total Page 7 Pages
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Alliance Semiconductor Corporation
ASM3P2821B pdf






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