Low-Jitter, Spread-Spectrum Clock Modulators Reduce EMI in Large-Format LCD Panels
Maxim introduced its DS1081L/DS1083L 16 MHz to 134 MHz, 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 percent, 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 DS1081L/DS1083L are appropriate 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 six-lead SOT23. 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).
Maxim Integrated Products