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PDF DS1081L Data sheet ( Hoja de datos )

Número de pieza DS1081L
Descripción Spread-Spectrum Clock Modulator
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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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.
Thewww.DataSheet4U.com 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
Pin Configuration and Typical Operating Circuit appear 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 Cost
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
DS1081LE+
-40°C to +125°C
DS1081LE+T
-40°C to +125°C
+Denotes lead-free package.
T Denotes tape-and-reel.
PIN-PACKAGE
8 TSSOP
8 TSSOP
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
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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DS1081L pdf
20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
Spread-Spectrum Enable
On power-up, the output clock (SSO) remains tri-stated
until the internal PLL reaches a stable frequency. The
SSEN input can be used to disable the spread-spec-
trum modulation and to tri-state the SSO output. If the
SSEN pin is pulled high, the spread-spectrum modula-
tion is turned off, but the device still uses the internal
PLL to generate the clock signal at SSO. If the SSEN pin
is floated, the output will be tri-stated.
Application Information
Power-Supply Decoupling
To achieve best results, it is highly recommended that a
decoupling capacitor is used on the IC power-supply
pins. Typical values of decoupling capacitors are 0.01µF
and 0.1µF. Use a high-quality, ceramic, surface-mount
capacitor, and mount it as close as possible to the VCC
and GND pins of the IC to minimize lead inductance.
fIN + (0.5%, 1.0%, 1.5%, OR 2.0% OF fIN)
fIN
fIN - (0.5%, 1.0%, 1.5%, OR 2.0% OF fIN)
fSSO
1
DITHER CYCLE
RATE
IF SSEN = 1
DITHER AMOUNT
(±0.5%, ±1.0%, ±1.5%, OR ±2.0%)
CLKIN RANGE (MHz)
66 TO 134
33 TO 80
20 TO 38
DITHER RATE
fIN/2048
fIN/1024
fIN/512
Figure 1. DS1081L Spread-Spectrum Frequency Modulation
TIME
Typical Operating Circuit
fIN = 20MHz TO
134MHz
CLKIN
SMSEL1
SMSEL2
GND
DS1081L
VCC
CRSEL
SSO
SSEN
VCC
fSSO
DITHERED
DECOUPLING
CAPACITOR
NOTE: IN THE ABOVE CONFIGURATION WITH SMSEL1, SMSEL2, AND SSEN CONNECTED TO GND AS WELL AS
CRSEL CONNECTED TO VCC AND SSEN CONNECTED TO GND, THE DEVICE IS CONFIGURED WITH A
SPREAD-SPECTRUM MAGNITUDE OF ±2.0%, AND ALLOWS A CLKIN BETWEEN 20MHz and 38MHz.
For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.
Package Information
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 Maxim Integrated Products, Inc.
is a registered trademark of Dallas Semiconductor Corporation.

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