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DS1081L

Description
20MHz to 134MHz Spread-Spectrum Clock Modulator for LCD Panels
File Size168KB,5 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

DS1081L Overview

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

Rev 0; 4/07
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 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.
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
Applications
LCD Panels for TVs, Desktop Monitors, and
Notebook and Tablet PCs
Automotive Telematics and Infotainment
Printers
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.
PART
DS1081LE+
DS1081LE+T
Ordering Information
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
8 TSSOP
8 TSSOP
+Denotes
lead-free package.
T
Denotes tape-and-reel.
Block Diagram
V
CC
Pin Configuration
TOP VIEW
DS1081L
CLKIN
f
IN
= 20MHz TO
134MHz
PLL WITH CENTER-
DITHERED
SPREAD
SPECTRUM
V
CC
SSO
f
SSO
= 20MHz to
134MHz (DITHERED)
CLKIN
1
8
7
DS1081L
6
5
V
CC
CRSEL
SSO
SSEN
SMSEL1 2
SMSEL2
3
ENABLE
LOGIC
CRSEL
SMSEL1
SMSEL2
SSEN
GND 4
CONFIGURATION
DECODE AND
CONTROL
GND
TSSOP
(4.40mm)
______________________________________________
Maxim Integrated Products
1
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.
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