asm3x2105a Alliance Memory, Inc, asm3x2105a Datasheet

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asm3x2105a

Manufacturer Part Number
asm3x2105a
Description
Frequency Reduction
Manufacturer
Alliance Memory, Inc
Datasheet
XOUT
XIN
October 2003
rev 1.0
Features
Product Description
The ASM3X2105A is a versatile spread spectrum
frequency modulator designed specifically for input clock
frequencies from 6MHz to 12MHz. The ASM3X2105A
can generate an EMI reduced clock from crystal, ceramic
resonator, or system clock. The ASM3X2105A offers
frequency deviation of ± 1%.
The ASM3X2105A reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of
Block Diagram
2575, Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com
FCC approved method of EMI attenuation.
Generates a 1X or ½ X low EMI spread spectrum
clock of the input frequency.
Input frequency range: 6MHz to 10 MHz.
Internal loop filter minimizes external components
and board space.
Frequency deviation: Maximum ± 1%.
SSON# control pin for spread spectrum enable
and disable options.
Low cycle-to-cycle jitter.
5.0V ± 5% operating voltage range.
TTL or CMOS compatible outputs.
Ultra-low power CMOS design.
Available in 8-pin SOIC and TSSOP.
Oscillator
Crystal
down stream clock and data dependent
Notice: The information in this document is subject to change without notice.
Frequency
Feedback
Divider
Divider
Alliance Semiconductor
SR0
Modulation
Detector
Phase
SSON#
signals. The ASM3X2105A 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 ASM3X2105A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
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 ASM3X2105A is targeted towards EMI management
for high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
The ASM3X2105A modulates the output of a single PLL
VDD
Filter
Loop
VSS
VCO
PLL
ASM3X2105A
Divider
Output
DIV2
MODOUT

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asm3x2105a Summary of contents

Page 1

... The ASM3X2105A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The ASM3X2105A 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 ...

Page 2

... Power supply for the entire chip (5V). Spread Deviation Table SR0 Spread Deviation (%) 1 ±1 0 Reserved Notice: The information in this document is subject to change without notice VDD XIN /CLK XOUT MODOUT 2 7 ASM3X2105A DIV2 SSON SR0 4 VSS Description Low Frequency EMI Reduction ASM3X2105A ...

Page 3

... The center frequency is the frequency of the external reference input on CLKIN, Pin1). Example: The ASM3X2105A is designed for communications, digital video and imaging applications not only optimized for operation in the 6MHz – 12MHz range, but its output frequency can be extended down to one half of the input clock frequency using the divide-by-two feature. This feature extends low frequency operation to as low as 3MHz. Setting pin 3 low (DIV2=0 ...

Page 4

... Alliance EMI reduction ICs. The figure below is an illustration of this simulation result. Please visit our website at www.alsc.com EMI-Lator ®. Notice: The information in this document is subject to change without notice. for information on how to obtain a free copy and demonstration of Simulation results From EMI-Lator® Low Frequency EMI Reduction ASM3X2105A ...

Page 5

... Power up time (first locked clock cycle after power up Clock out impedance OUT Notice: The information in this document is subject to change without notice. Rating -0 7.0 -65 to +125 GND – 0 20mA 5V 20mA) OH Low Frequency EMI Reduction ASM3X2105A Unit V °C °C Min Typ Max Unit - 0 µA 66 µ ...

Page 6

... JC t Output duty cycle +5V, Input Frequency = 8MHz Notice: The information in this document is subject to change without notice. Parameter and t are measured into a capacitive load of 15pF LH HL Low Frequency EMI Reduction ASM3X2105A Min Typ Max Unit MHz MHz - 440 ...

Page 7

... BSC H 0.224 0.248 L 0.012 0.028 θ 0° 8° Notice: The information in this document is subject to change without notice. 8-Pin SOIC (Pb Free Parts θ Dimensions in millimeters Min Max 1.45 1.80 0.10 0.25 1.35 1.75 0.31 0.51 0.10 0.25 4.72 5.12 3.75 4.15 1.27 BSC 5.70 6.30 0.30 0.70 0° 8° Low Frequency EMI Reduction ASM3X2105A ...

Page 8

... D 0.114 0.122 E 0.169 0.177 e 0.026 BSC H 0.244 0.260 L 0.018 0.030 θ 0° 8° Notice: The information in this document is subject to change without notice. 8-Pin TSSOP θ A1 Dimensions in millimeters Min Max 1.10 0.05 0.15 0.80 1.05 0.19 0.30 0.09 0.20 2.90 3.10 4.30 4.50 0.65 BSC 6.20 6.60 0.45 0.75 0° 8° Low Frequency EMI Reduction ASM3X2105A ...

Page 9

... X = Automotive 1 – reserved 2 - Non PLL based 3 – EMI Reduction 4 – DDR support products 5 – STD Zero Delay Buffer Alliance Semiconductor Mixed Signal Product Low Frequency EMI Reduction ASM3X2105A TAPE AND REEL TUBE TAPE AND REEL TUBE SR - SOIC, T/R QR – QFN, T QFN, TUBE BT - BGA, TUBE BR – ...

Page 10

... Alliance against all claims arising from such use. Notice: The information in this document is subject to change without notice. Copyright © Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: ASM3X2105A Document Version: v1.0 Low Frequency EMI Reduction ASM3X2105A ...

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