DS1181LE+T ,20MHz to 134MHz Spread-Spectrum Clock Modulator for LCD PanelsFeaturesThe DS1181L is a spread-spectrum clock modulator IC ● Modulates a 20MHz to 134MHz Clock wit ..
DS1200 ,Serial RAM ChipPIN DESCRIPTION System Access Control V - +5V CCSecure Personnel Areas Calibration RST - Re ..
DS1200S ,Serial RAM ChipPIN DESCRIPTION System Access Control V - +5V CCSecure Personnel Areas Calibration RST - Re ..
DS1200S ,Serial RAM Chipblock diagram (Figure 1) illustrates the main elements of the device: shift register, control logic ..
DS1202 ,Serial timekeeping chipFEATURES PIN ASSIGNMENT• Real time clock counts seconds, minutes, hours, dateof the month, month, d ..
DS1202N ,Serial timekeeping chipPIN DESCRIPTIONDS1202N 8–pin DIP (IND)NC – No ConnectionDS1202SN 16–pin SOIC (IND)X1, X2 – 32.768 K ..
DTA114EM , Built-In Bias Resistors Enable The Configuration of An Inverter Circuit Without Connecting External Input Resistors
DTA114ESATP , Built-in bias resistors enable the configuration of an inverter circuit without connecting external input resistors
DTA114EUA T106 , DTA114E series
DTA114EUA T106 , DTA114E series
DTA114EUAT106 , DTA114E series
DTA114EUA-T106 , DTA114E series
DS1181LE+T
20MHz to 134MHz Spread-Spectrum Clock Modulator for LCD Panels
General DescriptionThe DS1181L 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
DS1181L 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, allowing direct EMI control and
optimization. In addition, through an enable pin the dith-
ering can be enabled or disabled for easy comparison of
system performance during EMI testing. This same input
pin also allows the DS1181L output to be three-stated.
By dithering the system clock, all the address, data, and
timing signals generated from this signal are also dith-
ered so that the measured EMI at the fundamental and
harmonic frequencies is greatly reduced. This is accom-
plished without changing clock rise/fall times or adding
the space, weight, design time, and cost associated with
mechanical shielding.
The DS1181L 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●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 Cost●Low Power Consumption●3.3V Single Voltage Supply●-40°C to +125°C Temperature Range●Small 8-Pin TSSOP Package
Typical Operating Circuit appears at end of data sheet.+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PARTTEMP RANGEPIN-PACKAGEDS1181LE+-40°C to +125°C8 TSSOP
DS1181LE+T-40°C to +125°C8 TSSOP
SSO
GNDCRSELSMSEL1
SMSEL2
CLKIN
TSSOPTOP VIEW
VCC
SSEN
DS1181L
GND
SSOPLL WITH CENTER-
DITHERED
SPREAD-
SPECTRUM
CONFIGURATION
DECODE AND
CONTROL
SMSEL1
CLKIN
SMSEL2
fSSO = 20MHz to
134MHz (DITHERED)
VCC
VCC
fIN = 20MHz TO
134MHz
CRSEL
SSENENABLE
LOGIC
DS1181L
Pin Coniguration
Ordering Information
Block Diagram
DS1181L20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
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 VCC Relative to GND .............-0.5V to +4.3V
Voltage Range on Any Lead Relative
to GND ................-0.5V to (VCC + 0.5V), not to exceed +4.3V
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range ............................-55°C to +125°C
Soldering Temperature ..................See J-STD-020 Specification
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.(VCC = +3.0V to +3.6V, TA = -40°C to +125°C, unless otherwise noted.)
(VCC = +3.0V to +3.6V, TA = -40°C to +125°C, unless otherwise noted.)
(TA = -40°C to +125°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSSO Duty CyclefSSODCMeasured at VCC/24060%
SSO Rise TimetRCL = 7pF1ns
SSO Fall TimetFCL = 7pF1ns
Peak Cycle-to-Cycle JittertJTA = -40°C to +85°C, 10,000 cycles75ps
Power-Up TimetPOR(Note 2)50ms
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply CurrentICCCL = 7pF, fIN = 134MHz18mA
SMSEL1/SMSEL2/CLKIN Input LeakageIIL:10V < VIN < VCC-1+1µA
CRSEL/SSEN Input LeakageIIL:20V < VIN < VCC-100+100µA
Output Leakage (SSO)IOZSSEN = float-1+1µA
Low-Level Output Voltage (SSO)VOLIOL = 4mA0.4V
High-Level Output Voltage (SSO)VOHIOH = -4mA2.4V
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply VoltageVCC(Note 1)3.03.6V
Input Logic 1VIH0.8 x
VCC
VCC +
0.3V
Input Logic 0VIL-0.30.2 x
VCCV
Input Logic Float (SSEN, CRSEL)IFLOAT0V < VIN < VCC±1µA
SSO LoadCLSSO < 80MHz15pF80MHz ≤ SSO < 134MHz7
CLKIN FrequencyfIN20134MHz
CLKIN Duty CyclefINDC4060%
AC Electrical Characteristics
DC Electrical Characteristics
Recommended Operating Conditions
Absolute Maximum RatingsDS1181L20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
SPECTRUM ATTENUATION vs. FREQUENCY AT
DIFFERENT DITHER AMPLITUDESDS1181L toc06
FREQUENCY (MHz)
ATTENUATION (dB)
fOUT = 72MHz
fRBW = 120KHz
CENTER DITHER
±2%
±1.5%±1%
±0.5%
10dB13dB15dB17dB
DUTY CYCLE vs. TEMPERATUREDS1181L toc05
TEMPERATURE (°C)
DUTY CYCLE (%)
fCLKIN = 72MHz
DUTY CYCLE vs. SUPPLY VOLTAGEDS1181L toc04
VCC (V)
DUTY CYCLE (%)
fCLKIN = 72MHz
SUPPLY CURRENT vs. FREQUENCYDS1181L toc03
FREQUENCY (MHz)
ICC
(mA)
CL = 7pF
VCC = 3.6V
VCC = 3.0V
SUPPLY CURRENT vs. TEMPERATUREDS1181L toc02
TEMPERATURE (°C)
ICC
(mA)
fCLKIN = 134MHz
fCLKIN = 20MHz
CL = 7pF
fCLKIN = 66MHz
SUPPLY CURRENT vs. SUPPLY VOLTAGEDS1181L toc01
VCC (V)
ICC
(mA)
fCLKIN = 134MHz
fCLKIN = 20MHz
CL = 7pF
fCLKIN = 66MHz
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
DS1181L20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
Detailed DescriptionThe DS1181L modulates an input clock to generate a cen-
ter-dithered spread-spectrum output. A 20MHz to 134MHz
clock is applied to the CLKIN pin. An internal PLL dithers
the output clock about its center frequency at a user-se-
lectable magnitude.
Spread-Spectrum Dither MagnitudeThe DS1181L can generate dither magnitudes up to
±2%. The desired magnitude is selected using input pins
SMSEL1 and SMSEL2 as shown in Table 1.
Spread-Spectrum Dither RateThe output spread-spectrum dither rate is fixed at fIN/832.
Table 2. Dither Rate
Table 1. Dither Magnitude
CRSELCLKIN RANGE
(MHz)DITHER RATE66 to 134
fIN/832Float33 to 8020 to 38
SMSEL2SMSEL1MAGNITUDE
SELECTED (%)0±2.01±1.50±1.01±0.5
PINNAMEFUNCTIONCLKINClock Input. 20MHz to 134MHz clock input (fIN).SMSEL1
Spread-Spectrum Magnitude Select Inputs. These digital inputs select the desired spread-spectrum
magnitude as shown in the table below.
SMSEL2SMSEL1MAGNITUDE SELECTED (%)0±2.0SMSEL21±1.50±1.01±0.5GNDGroundSSEN
Spread-Spectrum Enable. Three-level input to enable/disable spread-spectrum and to three-state the
output.
0 = Power-up/spread-spectrum enabled
Float = SSO three-stated
1 = Power-up/spread-spectrum disabled (not a bypass mode).SSOSpread-Spectrum Clock Output. Outputs a center-dithered spread-spectrum version of the clock input at
CLKIN.CRSEL
Clock Range and Dither Rate Select. Three-level input that determines the dither rate. See the
Detailed Description section for details.
CRSELCLKIN RANGE (MHz)DITHER RATE66 to 134
fIN/832Float33 to 8020 to 38VCCSupply Voltage
Pin DescriptionDS1181L20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
Spread-Spectrum EnableOn power-up, the output clock (SSO) remains three-stat-
ed until the internal PLL reaches a stable frequency. The
SSEN input can be used to disable the spread-spectrum
modulation and to three-state the SSO output. If the SSEN
pin is pulled high, the spread-spectrum modulation is
turned off, but the device still uses the internal PLL to gen-
erate the clock signal at SSO. If the SSEN pin is floated,
the output is three-stated.
Applications Information
Power-Supply DecouplingTo 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 capaci-
tor, and mount it as close as possible to the VCC and GND
pins of the IC to minimize lead inductance.
Figure 1. DS1181L Spread-Spectrum Frequency Modulation
PACKAGE TYPEPACKAGE CODEDOCUMENT NO.LAND PATTERN NO.8 TSSOPH8+3
21-017590-0248CLKIN
SMSEL1
SMSEL2
GND
CRSEL
VCC
DECOUPLING
CAPACITOR
VCC
SSO
fIN = 20MHz TO
134MHz
NOTE: IN THE ABOVE CONFIGURATION WITH SMSEL1, SMSEL2, AND SSEN CONNECTED TO GND AS WELL ASCRSEL CONNECTED TO VCC, THE DEVICE IS CONFIGURED WITH A SPREAD-SPECTRUM MAGNITUDE OF 2.0%,
AND ALLOWS A CLKIN BETWEEN 20MHz and 38MHz.
fSSO
DITHERED
SSEN
DS1181L
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
TIME
DITHER CYCLE
RATE
DITHER AMOUNT
(±0.5%, ±1.0%, ±1.5%, OR ±2.0%)
CLKIN RANGE (MHz)DITHER RATE
20 TO 134fIN/832
IF SSEN = 1
Package InformationFor the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Typical Operating CircuitDS1181L20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
REVISION
NUMBER
REVISION
DATEDESCRIPTIONPAGES
CHANGED11/07Initial release.—8/08Increased the absolute maximum ratings range from +3.63V to +4.3V.22/15Removed automotive reference from data sheet1
Revision HistoryDS1181L20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
