ASM3I1819N-08-SR ALSC [Alliance Semiconductor Corporation], ASM3I1819N-08-SR Datasheet

ASM3I1819N-08-SR

Manufacturer Part Number

ASM3I1819N-08-SR

Description

Low Power Mobile VGA EMI Reduction IC

Manufacturer

ALSC [Alliance Semiconductor Corporation]

Datasheet

1.ASM3I1819N-08-SR.pdf (7 pages)

Current page: 1 of 7
Download datasheet (354Kb)

August 2005

rev 0.2

Features

Functional Description

The ASM3P1819N is a versatile spread spectrum

frequency modulator designed specifically for a wide range

of input clock frequencies from 20 to 40MHz. The

ASM3P1819N can generate an EMI reduced clock from

crystal, ceramic resonator, or system clock.

Block Diagram

XOUT

XIN

REF

2575 Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com

FCC approved method of EMI attenuation

Provides up to 15dB EMI reduction

Generates a low EMI spread spectrum clock

and a non-spread Reference Clock of the input

frequency

Optimized for frequency range from 20MHz to

40MHz

Internal loop filter minimizes external components

and board space

Down Spread Deviation: -1.25%

Low inherent Cycle-to-Cycle jitter

3.3V Operating Voltage

CMOS/TTL compatible inputs and outputs

Low power CMOS design

Supports notebook VGA and other LCD timing

Power Down function for mobile application

Products are available for industrial temperature

range.

Available in 8 pin SOIC and TSSOP Packages

controller applications

Oscillator

Crystal

Notice: The information in this document is subject to change without notice.

Low Power Mobile VGA EMI Reduction IC

Frequency

Feedback

Divider

PD#

Alliance Semiconductor

Modulation

Detector

Phase

The ASM3P1819N reduces electromagnetic interference

(EMI) at the clock source, allowing a system wide EMI

reduction for all the down stream clocks and data

dependent signals. The ASM3P1819N 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

regulations.

The ASM3P1819N modulates the output of a single PLL in

order to “spread” the bandwidth of a synthesized clock,

thereby decreasing the peak amplitude of its harmonics.

This result 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 ASM3P1819N

uses the most efficient and optimized modulation profile

approved by the FCC and is implemented by using a

proprietary all digital method

Applications

The ASM3P1819N is targeted towards EMI management

for memory and LVDS interfaces in mobile graphic chipsets

and high-speed digital applications such as PC peripheral

devices, consumer electronics and embedded controller

system.

Loop

Filter

VDD

VSS

VCO

PLL

ASM3P1819N

Divider

Output

EMI

ModOUT

Related parts for ASM3I1819N-08-SR

ASM3I1819N-08-SR Summary of contents

Page 1

August 2005 rev 0.2 Low Power Mobile VGA EMI Reduction IC Features FCC approved method of EMI attenuation Provides up to 15dB EMI reduction Generates a low EMI spread spectrum clock and a non-spread Reference Clock of the input frequency ...

Page 2

August 2005 rev 0.2 Pin Configuration Pin Description Pin# Pin Name Type 1 XIN I 2 VSS ModOUT O 5 REF VDD P 8 XOUT I Absolute Maximum Ratings Symbol ...

Page 3

August 2005 rev 0.2 DC Electrical Characteristics (Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated) Symbol Parameter V Input Low voltage IL V Input High voltage IH I Input Low current IL I Input High ...

Page 4

August 2005 rev 0.2 Package Information Symbol θ Note: Controlling dimensions are millimeters SOIC – 0.074 grams unit weight Low Power Mobile VGA EMI Reduction IC Notice: ...

Page 5

August 2005 rev 0.2 8-lead Thin Shrunk Small Outline Package (4.40-MM Body Symbol Min A A1 0.002 A2 0.033 B 0.008 c 0.004 D 0.114 E 0.169 0.020 θ Note: Controlling dimensions are millimeters ...

Page 6

... ASM3I1819NG-08-SR 3I1819NG ASM3P1819N -08-TT 3P1819N ASM3P1819N -08-TR 3P1819N ASM3P1819NF-08-TT 3P1819NF ASM3P1819NF-08-TR 3P1819NF ASM3P1819NG-08-TT 3P1819NG ASM3P1819NG-08-TR 3P1819NG ASM3I1819N -08-TT 3I1819N ASM3I1819N -08-TR 3I1819N ASM3I1819NF-08-TT 3I1819NF ASM3I1819NF-08-TR 3I1819NF ASM3I1819NG-08-TT 3I1819NG ASM3I1819NG-08-TR 3I1819NG Device Ordering Information Licensed under US patent #5,488,627, #6,646,463 and #5,631,920 Notice: The information in this document is subject to change without notice ...

Page 7

August 2005 rev 0.2 Alliance Semiconductor Corporation 2575 Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003 © Copyright 2003 Alliance ...

Related keywords

ASM3I1819N-08-SR datasheet
ASM3I1819N-08-SR data sheet
ASM3I1819N-08-SR pdf datasheet
ASM3I1819N-08-SR component
ASM3I1819N-08-SR part
ASM3I1819N-08-SR distributor
ASM3I1819N-08-SR RoHS
ASM3I1819N-08-SR datasheet download