DS1080LU+A00

Overview

The DS1080LU+A00 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 selectable clock multiplier rates of 1x, 2x, or 4x. The device features center spread-spectrum dithering with magnitudes of ±0.5%, ±1.0%, and ±1.5%. It includes a power-down mode for high-impedance output and low cycle-to-cycle jitter performance.

Feature Summary

• Generates spread-spectrum clocks from 16MHz to 134MHz using a 16MHz to 33.4MHz input crystal or clock
• Selectable clock multiplier rates of 1x, 2x, and 4x via the CMSEL pin
• Configurable spread-spectrum modulation magnitudes of ±0.5%, ±1.0%, and ±1.5% via the SMSEL pin
• Low power consumption with a dedicated power-down mode that tristates the SSO output

Applications

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

Procurement Notes

Verify the A00 suffix against official documentation to confirm specific manufacturing lot or revision details. Confirm RoHS compliance status as indicated by the '+' designation in the part number. Ensure the component is sourced from authorized distributors to guarantee authenticity and traceability.

Selection Notes

Select this component when a low-jitter, spread-spectrum clock source is required for EMI reduction. Ensure the application utilizes a parallel resonating crystal with an ESR less than 90Ω connected between X1 and X2. Verify that the system voltage remains within the 3.0V to 3.6V range and that the operating temperature falls between -40°C and +125°C.

Part Context

The DS1080LU+A00 belongs to the DS1080L family of spread-spectrum crystal multipliers manufactured by Analog Devices Inc./Maxim Integrated. It is housed in an 8-lead µSOP package. The 'A00' suffix typically denotes a specific internal revision or configuration variant within the standard DS1080LU+ product line.

Replacement Considerations

Direct replacements include other variants within the DS1080L family, such as the DS1080LU+T (tape and reel packaging). Cross-family replacement requires verifying compatible input frequencies, output load requirements, and pinout compatibility.

FAQ

How is the clock multiplier rate selected?

The clock multiplier rate (1x, 2x, or 4x) is selected via the tri-level digital input on the CMSEL pin. Logic 0 selects 1x, an open circuit selects 2x, and logic 1 selects 4x.

What is the function of the PDN pin?

The PDN pin controls the power-down state. Logic 0 places the device in power-down mode with a high-impedance output. An open circuit enables normal operation but disables spread-spectrum dithering. Logic 1 enables both normal operation and spread-spectrum dithering.

What are the requirements for the external crystal?

The device requires a parallel resonating crystal operating in fundamental mode with an equivalent series resistance (ESR) of less than 90Ω. Load capacitors CL1 and CL2 must be calculated based on the crystal's parallel load capacitance and the device's input capacitance.