DS1081LE+ Maxim Integrated Products, DS1081LE+ Datasheet

DS1081LE+

Manufacturer Part Number

DS1081LE+

Description

IC CLOCK MOD SS 8-TSSOP

Manufacturer

Maxim Integrated Products

Type

Clock Modulatorr

Datasheet

1.DS1081LET.pdf (5 pages)

Specifications of DS1081LE+

Input

Clock

Output

LVCMOS

Frequency - Max

134MHz

Voltage - Supply

3 V ~ 3.6 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

8-TSSOP

Frequency-max

134MHz

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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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.

Typical Operating Circuit appears at end of data sheet.

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.

134MHz

= 20MHz TO

CRSEL

SMSEL1

SMSEL2

LCD Panels for TVs, Desktop Monitors, and

Notebook and Tablet PCs

Automotive Telematics and Infotainment

Printers

CLKIN

DS1081L

General Description

PLL WITH CENTER-

CONFIGURATION

DECODE AND

CONTROL

SPECTRUM

DITHERED

SPREAD

20MHz to 134MHz Spread-Spectrum

Block Diagram

Applications

______________________________________________ Maxim Integrated Products

ENABLE

LOGIC

Clock Modulator for LCD Panels

SSO

134MHz (DITHERED)

SSEN

GND

SSO

= 20MHz to

♦ Modulates a 20MHz to 134MHz Clock with Center

♦ Selectable Spread-Spectrum Modulation

♦ Low 75ps Cycle-to-Cycle Jitter

♦ Spread-Spectrum Disable Mode

♦ Pin Compatible with Alliance/PulseCore

♦ 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

+ Denotes lead-free package.

T Denotes tape-and-reel.

DS1081LE+

DS1081LE+T

Spread-Spectrum Dithering

Magnitudes of:

Semiconductor P2040 Series Devices

TOP VIEW

±0.5%

±1.0%

±1.5%

±2.0%

PART

SMSEL1

SMSEL2

CLKIN

GND

-40°C to +125°C

TEMP RANGE

Ordering Information

(4.40mm)

TSSOP

DS1081L

Pin Configuration

CRSEL

SSO

SSEN

PIN-PACKAGE

8 TSSOP

Features

Related parts for DS1081LE+

DS1081LE+ Summary of contents

Page 1

... 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 Applications PART DS1081LE+ DS1081LE+T + Denotes lead-free package. T Denotes tape-and-reel TOP VIEW V CC SSO f ...

Page 2

Spread-Spectrum Clock Modulator for LCD Panels ABSOLUTE MAXIMUM RATINGS Voltage Range on V Relative to GND .............-0.5V to +3.63V CC Voltage Range on Any Lead Relative to GND ................-0. 0.5V), not to exceed +3.63V ...

Page 3

Spread-Spectrum (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. SUPPLY VOLTAGE 14 12 CLKIN = 134MHz 10 CLKIN = 66MHz 8 CLKIN = 20MHz 3.0 3.1 3.2 3.3 3.4 3.5 SUPPLY ...

Page 4

Spread-Spectrum Clock Modulator for LCD Panels PIN NAME 1 Clock Input. 20MHz to 134MHz clock input (f CLKIN Spread-Spectrum Magnitude Select Inputs. These digital inputs select the desired spread-spectrum magnitude as shown in the table below. 2 ...

Page 5

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 © 2007 Maxim Integrated Products is a registered trademark of Dallas Semiconductor Corporation ...

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