P1819 ALSC [Alliance Semiconductor Corporation], P1819 Datasheet

P1819

Manufacturer Part Number

P1819

Description

Notebook LCD Panel EMI Reduction IC

Manufacturer

ALSC [Alliance Semiconductor Corporation]

Datasheet

1.P1819.pdf (9 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

P1819BF

Manufacturer:

PHI

Quantity:

1 645

Current page: 1 of 9
Download datasheet (370Kb)

XIN/CLKIN

November 2005

rev 1.7

Features

Product Description

The P1819 is a Versatile Spread Spectrum Frequency

Modulator designed specifically for input clock frequencies

from 20 to 40MHz. (Refer Input Frequency and Modulation

Rate

interference (EMI) at the clock source, allowing system

wide reduction of EMI of

dependent signals. The P1819 allows significant system

cost savings by reducing the number of circuit board layers

Block Diagram

XOUT

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 20 to 40MHz.

Internal loop filter minimizes external components

and board space.

Selectable spread options: Down and Center.

Low Inherent Cycle-to-Cycle jitter.

Eight spread % selections: ±0.625% to –3.5%.

3.3V ± 0.3V Operating Voltage range.

Low power CMOS design.

Supports notebook VGA and other LCD timing

controller applications.

Power Down function for mobile application.

Available in Commercial temperature range.

Available in 8-pin SOIC and TSSOP Packages.

Table).

Oscillator

Crystal

The

P1819

down stream clock and data

reduces

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

Notebook LCD Panel EMI Reduction IC

Frequenc

Feedback

Divider

electromagnetic

Alliance Semiconductor

D_C/NC PD#

Modulation

Detector

Phase

SRS

ferrite beads, shielding and other passive components that

are traditionally required to pass EMI regulations.

The P1819 modulates the output of a single PLL in order to

“spread” the bandwidth of a synthesized clock, and more

importantly,

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’.

The P1819 uses the most efficient and optimized

modulation

implemented in a proprietary all digital method.

Applications

The P1819 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

systems.

Loop

Filter

profile

decreases

VDD

VSS

approved

VCO

the

PLL

peak

the

amplitudes

Divider

Output

FCC

P1819

and

ModOUT

its

Related parts for P1819

P1819 Summary of contents

Page 1

... Notice: The information in this document is subject to change without notice. ferrite beads, shielding and other passive components that are traditionally required to pass EMI regulations. The P1819 modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, and more importantly, harmonics ...

Page 2

... XIN / CLKIN Note: Pin P1819Q Note Book LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. XOUT 8 1 XIN / CLKIN VSS 7 2 VDD D_C / REF ...

Page 3

... Input Frequency and Modulation Rate Part Number Input Frequency Range P1819 20MHz to 40MHz Spread Deviation Selection Part Number P1819A P1819B P1819C P1819D P1819E P1819F P1819G P1819H P1819Q Absolute Maximum Ratings Symbol Voltage on any pin with respect to Ground Storage temperature STG ...

Page 4

... LH HL Note Book LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. Min VSS – 0.3 2.0 -60 3. 20mA - OL = 20mA 2 min - 3 Min -200 45 P1819 Typ Max Unit - 0 0 -20.0 µA - 1.0 µ max 4.5 ...

Page 5

... A2 A θ Dimensions Inches Millimeters Min Max Min 0.004 0.010 0.10 0.053 0.069 1.35 0.049 0.059 1.25 0.012 0.020 0.31 0.007 0.010 0.18 0.193 BSC 4.90 BSC 0.154 BSC 3.91 BSC 0.050 BSC 1.27 BSC 0.236 BSC 6.00 BSC 0.016 0.050 0.41 0° 8° 0° P1819 C L Max 0.25 1.75 1.50 0.51 0.25 1.27 8° ...

Page 6

... Note Book LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice θ A1 Dimensions Inches Millimeters Max Min 0.043 0.006 0.05 0.037 0.85 0.012 0.19 0.008 0.09 0.122 2.90 0.177 4.30 0.026 BSC 0.252 BSC 0.028 0.50 0° 8° 0° P1819 Max 1.10 0.15 0.95 0.30 0.20 3.10 4.50 0.65 BSC 6.40 BSC 0.70 8° ...

Page 7

... P1819AG-08SR P1819AG 20-40 P1819AG-08TT P1819AG 20-40 P1819AG-08TR P1819AG 20-40 P1819B-08ST P1819B 20-40 P1819B-08SR P1819B 20-40 P1819B-08TT P1819B 20-40 P1819B-08TR P1819B 20-40 P1819BF-08ST P1819BF 20-40 P1819BF-08SR P1819BF 20-40 P1819BF-08TT P1819BF 20-40 P1819BF-08TR P1819BF 20-40 P1819BG-08ST P1819BG 20-40 P1819BG-08SR P1819BG 20-40 P1819BG-08TT P1819BG 20-40 P1819BG-08TR P1819BG 20-40 Products are available for industrial temperature range operation. Please contact factory for more information. ...

Page 8

... TT – TSSOP, TUBE TR - TSSOP, T/R ST – SOIC, TUBE Pin Count F =Lead Free and and RoHS compliant part G = Green Deviation (%) and Spread option Identifier DEVICE NUMBER Flow Commercial Temperature Range (0°C to 70° Industrial Temperature Range (-40°C to 85°C) P1819 - ...

Page 9

... Alliance against all claims arising from such use. Note Book LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. P1819 Copyright © Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: P1819 Document Version: v1 ...

Related keywords

P1819 datasheet
P1819 data sheet
P1819 pdf datasheet
P1819 component
P1819 part
P1819 distributor
P1819 RoHS
P1819 datasheet download