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DS1181L
20MHz to 134MHz Spread-Spectrum Clock Modulator for LCD Panels

Low-Jitter, Spread-Spectrum Clock Modulators Reduce EMI in Large-Format LCD Panels


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 160kB)
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Description
The 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 modulated 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 dithering 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 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 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.

Key Features   Applications/Uses
  • 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

 
  • Automotive Telematics and Infotainment
  • Large Format LCD Panels in Televisions and PC Monitors
  • Printers

    Key Specifications:  Clock Generators
    Part Number Applications fIN
    (MHz)
    fIN
    (MHz)
    fOUT
    (MHz)
    fOUT
    (MHz)
    Fixed or Continuous Frequency Output Levels Out-
    puts
    PLLs Program-
    mability
    Spread Spectrum Output Jitter
    (ps)
    VSUPPLY
    (V)
    Package/Pins Price
    min max min max RMS See Notes
    DS1181L  General Purpose 20 134 20 134 Continuous LVCMOS 1 1 Pin Yes 75 3.3
    TSSOP/8
    $1.01 @1k
    See All Clock Generators (27)

    Diagram
    DS1181L: Typical Operating Circuit
    Typical Operating Circuit

    Design Guides
  • System Timing & Control (PDF)

    Reliability Reports
  • Reliability Report: DS1181L.pdf

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-2 of 2

    DS1181L Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS1181LE+  
    Active TSSOP;8 pin;20 mm²
    Outline Drawing: 21-0175 (PDF)
    Land Pattern: 90-0248 (PDF)
    Use pkgcode/variation: H8+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1181LE+T    
    Active TSSOP;8 pin;20 mm²
    Outline Drawing: 21-0175 (PDF)
    Land Pattern: 90-0248 (PDF)
    Use pkgcode/variation: H8+3*
    -40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • DS108x Family Ad: Download

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    2007-10-30
    This page last modified: 2009-06-01


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