Low-Jitter, Spread-Spectrum Clock Modulators Reduce EMI in Large-Format LCD Panels
Note to Editor:
- The DS1081L/DS1083L are 16MHz to 134MHz spread-spectrum clock modulators.
- These modulators dither an existing clock signal to reduce radiated electromagnetic interference (EMI) without expensive shielding and filtering.
- An internal phase-locked loop (PLL) modulates the output clock around its center frequency at a user-selectable magnitude.
- These modulators are ideal for dithering the row/column-driver clock signal in large-format LCD panels for televisions and PC monitors.
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SUNNYVALE, CA—August 21, 2007—Maxim Integrated Products (NASDAQ: MXIM) introduces the DS1081L/DS1083L* 16MHz to 134MHz, center spread-spectrum clock modulators. These modulators use an integrated phase-locked loop (PLL) to dither the clock output around its center frequency at a user-selectable magnitude from 0 (disabled) to ±2.0%, thus reducing peak EMI at fundamental and harmonic frequencies. This EMI reduction is accomplished without changing clock rise/fall times or adding the space, weight, design time, and costs associated with mechanical shielding. The low-cost DS1081L/DS1083L are ideal for dithering the row/column-driver clock signal in large-format LCD panels in televisions and PC monitors.
Packaged in an 8-pin TSSOP, the DS1081L provides logic inputs that allow the user to set the dither rate and magnitude, disable/enable spread-spectrum modulation, and shutdown the output to conserve power. The DS1083L is packaged in a smaller, thin 6-lead SOT23. Because it has fewer pins than the DS1081L, the DS1083L does not offer the ability to disable spread-spectrum modulation or shutdown the output. Both products use the same PLL design to ensure low 75ps cycle-to-cycle jitter performance.
The DS1081L/DS1083L provide 3.0V to 3.6V operation over the wide temperature range of -40°C to +125°C. Prices start at $0.87 (10,000-up, FOB USA).
*Future product—contact factory for availability.
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