DS1181LE+

Overview

The DS1181LE+ is a spread-spectrum clock modulator IC designed to reduce electromagnetic interference (EMI) in digital electronic equipment. It accepts an input clock signal between 20MHz and 134MHz and delivers a center-dithered output using an integrated phase-locked loop (PLL). The device operates on a single 3V to 3.6V supply, features low cycle-to-cycle jitter of 75ps, and supports selectable modulation magnitudes. Packaged in an 8-TSSOP format, it functions within a temperature range of -40°C to +125°C.

Feature Summary

• Modulates 20MHz to 134MHz clocks with selectable dither magnitudes: ±0.5%, ±1.0%, ±1.5%, or ±2.0% via SMSEL pins
• Low peak cycle-to-cycle jitter of 75ps at temperatures up to +85°C
• Spread-spectrum enable/disable control via SSEN pin allows three-stating the output for EMI testing comparisons
• Pin-compatible with Alliance/PulseCore Semiconductor P2040 series devices

Applications

• LCD panels for TVs, desktop monitors, notebook PCs, and tablet PCs
• Printers
• High clock-frequency-based digital electronic equipment requiring EMI reduction

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated by the '+' suffix. Check current availability status, as this specific part number may be subject to discontinuation notices from Analog Devices/Maxim Integrated.

Selection Notes

Select the DS1181LE+ when system design requires active EMI mitigation without mechanical shielding. Ensure input clock frequency falls within the 20MHz to 134MHz range. Verify that the required modulation depth matches the available pin-selectable options. Consider the 8-TSSOP package constraints for PCB layout and thermal management.

Part Context

The DS1181LE+ belongs to the DS1181L family of spread-spectrum clock modulators manufactured by Maxim Integrated, now part of Analog Devices Inc. The 'E' suffix denotes the extended industrial temperature range (-40°C to +125°C), while the '+' indicates lead-free/RoHS-compliant packaging. This component serves as a specialized timing solution for display and peripheral interfaces.

Replacement Considerations

The datasheet notes pin compatibility with the Alliance/PulseCore Semiconductor P2040 series. Verify electrical parameters and pin assignments before substituting.