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DS1081LE+T

P1-P3P4-P6
DS1081L
20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
________________________________________________________________
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.
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
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
19-6013; Rev 1; 10/11
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
DS1081LE+ -40°C to +125°C 8 TSSOP
DS1081LE+T -40°C to +125°C 8 TSSOP
Block Diagram
GND
SSO
PLL WITH CENTER-
DITHERED
SPREAD
SPECTRUM
CONFIGURATION
DECODE AND
CONTROL
SMSEL1
CLKIN
SMSEL2
f
SSO
= 20MHz to
134MHz (DITHERED)
V
CC
V
CC
f
IN
= 20MHz TO
134MHz
CRSEL
SSEN
ENABLE
LOGIC
DS1081L
Typical Operating Circuit appears at end of data sheet.
SSO
GND
1
2
8
7 CRSELSMSEL1
SMSEL2
CLKIN
TOP VIEW
3
4
6
5
V
CC
SSEN
DS1081L
Pin Configuration
DS1081L
20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40°C to +125°C, unless otherwise noted.)
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.
Voltage Range on V
CC
Relative to GND .............-0.5V to +3.63V
Voltage Range on Any Pin Relative
to GND ................-0.5V to (V
CC
+ 0.5V), not to exceed +3.63V
Operating Temperature Range .........................-40°C to +125°C
Continuous Power Dissipation (T
A
= +70°C)
TSSOP (derate 8.1mW/°C above +70°C) ..................646.7mW
Storage Temperature Range .............................-55°C to +125°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
CC
(Note 1) 3.0 3.6 V
Input Logic 1 V
IH
0.8 x
V
CC
V
CC
+
0.3
V
Input Logic 0 V
IL
-0.3
0.2 x
V
CC
V
Input Logic Open (SSEN, CRSEL) I
OPEN
0V < (Voltage applied to SSEN or
CRSEL) < V
CC
±1 μA
SSO < 80MHz 15
SSO Load C
L
80MHz SSO < 134MHz 7
pF
CLKIN Frequency f
IN
20 134 MHz
CLKIN Duty Cycle f
INDC
40 60 %
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= -40°C to +125°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current I
CC
C
L
= 7pF
f
IN
= 134MHz
15 mA
SMSEL1/SMSEL2/CLKIN Input Leakage I
IL:1
0V < V
IN
< V
CC
-1 +1 μA
CRSEL/SSEN Input Leakage I
IL:2
0V < V
IN
< V
CC
-100 +100 μA
Output Leakage (SSO) I
OZ
SSEN = open -1 +1 μA
Low-Level Output Voltage (SSO) V
OL
I
OL
= 4mA 0.4 V
High-Level Output Voltage (SSO) V
OH
I
OH
= -4mA 2.4 V
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= -40°C to +125°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SSO Duty Cycle f
SSODC
Measured at V
CC
/2 40 60 %
SSO Rise Time t
R
C
L
= 7pF 1 ns
SSO Fall Time t
F
C
L
= 7pF 1 ns
Peak Cycle-to-Cycle Jitter t
J
T
A
= -40°C to +85°C, 10,000 cycles 75 ps
Power-Up Time t
POR
(Note 2) 50 ms
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.
DS1081L
20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
_______________________________________________________________________________________ 3
SUPPLY CURRENT vs. SUPPLY VOLTAGE
DS1081L toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.53.43.33.23.1
2
4
6
8
10
12
14
0
3.0 3.6
CLKIN = 134MHz
CLKIN = 20MHz
CLKIN = 66MHz
SUPPLY CURRENT vs. TEMPERATURE
DS1081L toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
12010080604020-20 0
2
4
6
8
10
12
14
0
-40
CLKIN = 134MHz
CLKIN = 33MHz
CLKIN = 66MHz
134
SUPPLY CURRENT vs. FREQUENCY
DS1081L toc03
FREQUENCY (MHz)
SUPPLY CURRENT (mA)
11696765636
2
4
6
8
10
12
14
0
20
V
CC
= 3.6V
V
CC
= 3.0V
DUTY CYCLE vs. TEMPERATURE
DS1081L toc04
TEMPERATURE (°C)
DUTY CYCLE (%)
12010060 800 20 40-20
42
44
46
48
50
52
54
56
58
60
40
-40
CLKIN = 66MHz
DUTY CYCLE vs. SUPPLY VOLTAGE
DS1081L toc05
SUPPLY VOLTAGE (V)
DUTY CYCLE (%)
3.53.43.33.23.1
42
44
46
48
50
52
54
56
58
60
40
3.0 3.6
CLKIN = 66MHz
SPECTRUM ATTENUATION vs. FREQUENCY
AT DIFFERENT DITHER AMPLITUDES
DS1081L toc06
FREQUENCY (MHz)
ATTENUATION (dB)
f
OUT
= 40MHz
±
2%
±
1.5%
0.5%
6dB
4.5dB
3dB
±
1%
f
OUT
= 40MHz
RBW = 120KHz
CENTER DITHER
P1-P3P4-P6

DS1081LE+T

Mfr. #:
Buy DS1081LE+T
Manufacturer:
Maxim Integrated
Description:
Clock Generators & Support Products Spread-Spectrum CLK Modulator For LCD
Lifecycle:
New from this manufacturer.
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