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Alliance Semiconductor Corporation
Alliance Semiconductor Corporation

ASM3P2853A Datasheet Preview

ASM3P2853A Datasheet

Peak EMI Reducing Solution

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ASM3P2853A pdf
December 2004
wrwewv.D0a.ta7Sheet4U.com
ASM3P2853A
Peak EMI Reducing Solution
Features
Generates an EMI optimized clock signal at
output.
Input frequency: 25 MHz.
Frequency outputs:
o USB Clock (48 MHz unmodulated)
o 50 MHz (modulated), ±1% centre spread
Modulation rate: 39 KHz.
Spread Spectrum ON/OFF control
Supply voltage range 2.5V ± 5%.
Available in 8-pin SOIC package.
Commercial Temperature range.
Product Description
The ASM3P2853A is a versatile spread spectrum
frequency modulator. The ASM3P2853A reduces
electromagnetic interference (EMI) at the clock source.
The ASM3P2853A allows significant system cost savings
by reducing the number of circuit board layers and
shielding that are required to pass EMI regulations. The
ASM3P2853A 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.
Applications
ASM3P2853A is targeted towards EMI management for
high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Block Diagram
VDD
PWDNB
XIN
XOUT
SSONB
Crystal
Oscillator
VSS
PLL1
PLL2
USB Clock
(48 MHz
Unmodulated)
50 MHz
Modulated
Alliance Semiconductor
2575 Augustine Drive Santa Clara CA Tel: 408-855-4900 Fax: 408-855-4999 www.alsc.com



Alliance Semiconductor Corporation
Alliance Semiconductor Corporation

ASM3P2853A Datasheet Preview

ASM3P2853A Datasheet

Peak EMI Reducing Solution

No Preview Available !

ASM3P2853A pdf
December 2004
wrwewv.D0a.ta7Sheet4U.com
Pin Configuration
ASM3P2853A
XIN 1
8 50 MHz
XOUT 2
7 USB Clock
ASM3P2853A
VDD 3
6 SSONB
VSS 4
5 PWDNB
Pin Description
Pin Name
XIN
XOUT
VDD
VSS
PWDNB
SSONB
USB Clock
50 MHz
Type
I
O
P
P
I
I
O
O
Description
Connection to crystal or external reference frequency input. This pin has dual
functions. It can be connected either to an external crystal or an external
reference clock.
Connection to crystal. If using an external reference clock, this pin must be left
unconnected.
Power supply for the analog and digital blocks
Ground to entire chip.
Power-down control pin. Pull low to enable the power-down mode. Connect to
VDD, if not used.
Digital logic input used to enable spread spectrum function (Active LOW).
Spread spectrum is enabled when LOW, disabled when HIGH.
Clock output -1 (48 MHz unmodulated)
Clock output -2 (50 MHz modulated)
Peak EMI Reducing Solution
2 of 8


Part Number ASM3P2853A
Description Peak EMI Reducing Solution
Maker Alliance Semiconductor Corporation
Total Page 8 Pages
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