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DS1081L

20MHz to 134MHz Spread-Spectrum Clock Modulator for LCD Panels

Maxim Integrated 

19-6013; Rev 1; 10/11

20MHz to 134MHz Spread-Spectrum

Clock Modulator for LCD Panels

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 three-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

Typical Operating Circuit appears at end of data sheet.

Block Diagram

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 Power Consumption

♦ 3.3V Single Voltage Supply

♦ -40°C to +125°C Temperature Range

♦ Small 8-Pin TSSOP Package

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

DS1081LE+

-40°C to +125°C

8 TSSOP

DS1081LE+T

-40°C to +125°C

8 TSSOP

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Pin Configuration

CLKIN

fIN = 20MHz TO

134MHz

CRSEL

SMSEL1

SMSEL2

DS1081L

PLL WITH CENTER-

DITHERED

SPREAD

SPECTRUM

VCC

VCC

SSO

fSSO = 20MHz to

134MHz (DITHERED)

CONFIGURATION

DECODE AND

CONTROL

ENABLE

LOGIC

SSEN

GND

TOP VIEW

CLKIN 1

SMSEL1 2

SMSEL2 3

GND 4

DS1081L

8 VCC

7 CRSEL

6 SSO

5 SSEN

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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