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General Description

The DS1081L is a spread-spectrum clock modulator IC

that reduces EMI in high clock-frequency-based, digital

electronic equipment.

Using an integrated phase-locked loop (PLL), the

DS1081L accepts an input clock signal in the range of

20MHz to 134MHz and delivers a spread-spectrum mod-

ulated output clock signal. The PLL modulates, or dithers,

the output clock about the center input frequency at a

pin-selectable magnitude and dither rate, allowing direct

EMI control and optimization. In addition, through an

enable pin the dithering can be enabled or disabled for

easy comparison of system performance during EMI test-

ing. This same input pin also allows the DS1081L output

to be tri-stated.

By dithering the system clock, all the address, data,

and timing signals generated from this signal are also

dithered so that the measured EMI at the fundamental

and harmonic frequencies is greatly reduced. This is

accomplished without changing clock rise/fall times or

adding the space, weight, design time, and cost asso-

ciated with mechanical shielding.

The DS1081L is provided in an 8-pin TSSOP package

and operates over a full automotive temperature range

of -40°C to +125°C.

Applications

LCD Panels for TVs, Desktop Monitors, and

Notebook and Tablet PCs

Automotive Telematics and Infotainment

Printers

Features

♦ Modulates a 20MHz to 134MHz Clock with Center

Spread-Spectrum Dithering

♦ Selectable Spread-Spectrum Modulation

Magnitudes of:

±0.5%

±1.0%

±1.5%

±2.0%

♦ Low 75ps Cycle-to-Cycle Jitter

♦ Spread-Spectrum Disable Mode

♦ Pin Compatible with Alliance/PulseCore

Semiconductor P2040 Series Devices

♦ Clock Output Disable

♦ Low Cost

♦ Low Power Consumption

♦ 3.3V Single Voltage Supply

♦ -40°C to +125°C Temperature Range

♦ Small 8-Pin TSSOP Package

DS1081L

20MHz to 134MHz Spread-Spectrum

Clock Modulator for LCD Panels

______________________________________________

Maxim Integrated Products

Rev 0; 4/07

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Denotes lead-free package.

Denotes tape-and-reel.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

DS1081LE+ -40°C to +125°C 8 TSSOP

DS1081LE+T -40°C to +125°C 8 TSSOP

Block Diagram

GND

SSO

PLL WITH CENTER-

DITHERED

SPREAD

SPECTRUM

CONFIGURATION

DECODE AND

CONTROL

SMSEL1

CLKIN

SMSEL2

SSO

= 20MHz to

134MHz (DITHERED)

= 20MHz TO

134MHz

DS1081L

CRSEL

SSEN

ENABLE

LOGIC

Pin Configuration and Typical Operating Circuit appear at

end of data sheet.

SSO

GND

7 CRSELSMSEL1

SMSEL2

CLKIN

TSSOP

(4.40mm)

TOP VIEW

DS1081L

SSEN

Pin Configuration

1 2 3 4 5

Indice de contenidos

Pagina 1 - Denotes tape-and-reel

General DescriptionThe DS1081L is a spread-spectrum clock modulator ICthat reduces EMI in high clock-frequency-based, digitalelectronic equipment.Usin

Pagina 2 - AC ELECTRICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGSRECOMMENDED OPERATING CONDITIONS(TA= -40°C to +125°C, unless otherwise noted.)Stresses beyond those listed under “Absolute Max

Pagina 3

DS1081L20MHz to 134MHz Spread-SpectrumClock Modulator for LCD Panels_____________________________________________________________________3Typical Oper

Pagina 4 - Pin Description

Detailed DescriptionThe DS1081L modulates an input clock to generate acenter-dithered spread-spectrum output. A 20MHz to134MHz clock is applied to the

Pagina 5 - Application Information

DS1081L20MHz to 134MHz Spread-SpectrumClock Modulator for LCD PanelsMaxim cannot assume responsibility for use of any circuitry other than circuitry e

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Rainbow-electronics DS1081L Manual de usuario

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