DS1083LR+T

The DS1083LR+T is a spread-spectrum clock modulator IC designed to reduce EMI in digital electronic equipment. Utilizing an integrated phase-locked loop (PLL), it accepts an input clock signal ranging from 16MHz to 134MHz and outputs a spread-spectrum modulated clock signal. The modulation magnitude is pin-selectable, offering options of ±0.5%, ±1%, ±1.5%, and ±2%.

The device automatically adjusts the dither rate based on the input clock frequency to maximize EMI reduction. By dithering the system clock, address, data, and timing signals are also dithered, significantly reducing measured EMI at fundamental and harmonic frequencies without altering clock rise/fall times or requiring mechanical shielding.

This clock modulator features low cycle-to-cycle jitter of 75ps and operates over a full automotive temperature range of -40°C to +125°C. It is supplied in a compact, 6-lead thin SOT23 package and requires a single 3.3V supply.

Key applications include LCD panels for TVs, desktop monitors, notebook and tablet PCs, as well as automotive telematics and infotainment systems, and printers.