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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1081L Datasheet

Spread-Spectrum Clock Modulator

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DS1081L pdf
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1081L Datasheet

Spread-Spectrum Clock Modulator

No Preview Available !

DS1081L pdf
20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
ABSOLUTE MAXIMUM RATINGS
Voltage Range on VCC Relative to GND .............-0.5V to +3.63V
Voltage Range on Any Lead Relative
to GND ................-0.5V to (VCC + 0.5V), not to exceed +3.63V
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...................See J-STD-020 Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(TA = -40°C to +125°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
VCC (Note 1)
Input Logic 1
VIH
Input Logic 0
Input Logic Float (SSEN, CRSEL)
SSO Load
CLKIN Frequency
CLKIN Duty Cycle
VIL
VFLOAT
CL
fIN
fINDC
0V < VIN < VCC
SSO < 80MHz
80MHz  SSO < 134MHz
MIN
3.0
0.8 x
VCC
-0.3
20
40
TYP
MAX
3.6
VCC +
0.3
0.2 x
VCC
±1
15
7
134
60
UNITS
V
V
V
μA
pF
MHz
%
DC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40°C to +125°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Supply Current
ICC
CL = 7pF
fIN = 134MHz
SMSEL1/SMSEL2/CLKIN Input Leakage IIL:1 0V < VIN < VCC
CRSEL/SSEN Input Leakage
IIL:2 0V < VIN < VCC
Output Leakage (SSO)
IOZ SSEN = float
Low-Level Output Voltage (SSO)
VOL IOL = 4mA
High-Level Output Voltage (SSO)
VOH IOH = -4mA
MIN
-1
-100
-1
2.4
TYP
MAX UNITS
15 mA
+1
+100
+1
0.4
μA
μA
μA
V
V
AC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40°C to +125°C, unless otherwise noted.)
PARAMETER
SSO Duty Cycle
SSO Rise Time
SSO Fall Time
Peak Cycle-to-Cycle Jitter
Power-Up Time
SYMBOL
CONDITIONS
fSSODC Measured at VCC/2
tR CL = 7pF
tF
tJ
tPOR
CL = 7pF
TA = -40°C to +85°C, 10,000 cycles
(Note 2)
MIN TYP
40
1
1
75
Note 1: All voltages referenced to ground. Currents into the IC are positive and out of the IC are negative.
Note 2: Time between power applied to device and stable output.
MAX
60
50
UNITS
%
ns
ns
ps
ms
2 _____________________________________________________________________


Part Number DS1081L
Description Spread-Spectrum Clock Modulator
Maker Maxim Integrated Products
Total Page 5 Pages
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