DS1080LU+

Overview

The DS1080LU+ is a low-jitter, crystal-based clock generator with an integrated phase-locked loop (PLL) designed to generate spread-spectrum clock outputs ranging from 16MHz to 134MHz. It operates on a single 3.0V to 3.6V supply and supports input frequencies between 16.0MHz and 33.4MHz. The device features pin-programmable clock multiplier rates of 1x, 2x, or 4x, and selectable dither magnitudes of ±0.5%, ±1.0%, or ±1.5%. It includes a spread-spectrum disable mode and a power-down mode for power conservation, housed in an 8-lead µSOP package.

Feature Summary

• Generates spread-spectrum clocks from 16MHz to 134MHz using an internal PLL
• Pin-selectable clock multiplication ratios: 1x, 2x, and 4x via CMSEL
• Configurable center spread-spectrum dithering magnitudes: ±0.5%, ±1.0%, and ±1.5% via SMSEL
• Low cycle-to-cycle jitter (typical 75ps at 16MHz) and high-impedance output in power-down mode

Applications

• Automotive systems
• Cable modems
• Cell phones
• Computer peripherals
• PCs and printers

Procurement Notes

Verify the component status as active or obsolete through official Analog Devices/Maxim Integrated channels before procurement. Confirm that the ordering suffix '+' indicates a lead-free/RoHS-compliant package. Ensure the specific package type matches the design requirements, as variations such as tape-and-reel options exist within the DS1080L family.

Selection Notes

Select the DS1080LU+ when a low-jitter, single-supply clock multiplier with spread-spectrum capabilities is required. Ensure the input source is a parallel resonating crystal with an ESR less than 90Ω or a clock signal between 16MHz and 33.4MHz. Verify that the required output frequency range falls within 16MHz to 134MHz and that the 8-lead µSOP package fits the PCB layout constraints.

Part Context

The DS1080LU+ belongs to the DS1080L series of spread-spectrum crystal multipliers manufactured by Analog Devices Inc./Maxim Integrated. The 'LU' designation specifies the -40°C to +125°C temperature range and the 8-lead µSOP package. The '+' suffix denotes RoHS compliance and lead-free construction. Other variants include automotive qualified versions (DS1080LU/V+) and tape-and-reel packaging options (DS1080LU+T).

Replacement Considerations

Direct replacements within the same family include DS1080LU+T for tape-and-reel packaging needs. Automotive applications may require the DS1080LU/V+ variant. Cross-family substitution requires verification of voltage levels, package dimensions, and electrical characteristics against the target application specifications.