MAX31D80T-UGQ+

Clock Generators, PLLs, Frequency Synthesizers Overview

The MAX31D80T-UGQ+ is a spread-spectrum clock generator featuring an internal phase-locked loop (PLL). It generates a down-dithered clock output ranging from 2MHz to 134MHz using an input clock or crystal. Factory-programmed for a 27MHz input and 100MHz output with a 31.25kHz dither rate, it operates on a 3.0V to 3.6V supply over the -40°C to +125°C automotive temperature range. The device buffers the input signal on a separate pin and utilizes a 10-pin TDFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates down-dithered spread-spectrum clocks from 2MHz to 134MHz
• Factory-programmable for specific input/output frequency combinations
• Operates over the full automotive temperature range (-40°C to +125°C)
• Buffers the incoming clock signal on a dedicated XOUT pin

Clock Generators, PLLs, Frequency Synthesizers Applications

• Graphics Cards
• Set-Top Boxes
• Automotive Infotainment
• Printers

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the factory-programmed output specifications against the Selector Guide table in the datasheet. Confirm that the 'T' suffix indicates tape-and-reel packaging and the '+' suffix denotes lead-free/RoHS compliance. Ensure the application circuit includes appropriate decoupling capacitors near the VCC pins to minimize lead inductance.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a fixed-frequency, down-dithered clock is required without external programming resistors. Compare against the MAX31C80 variant if center-dithering is necessary instead of down-dithering. Verify that the 10-pin TDFN footprint fits the design constraints and that the 3.3V nominal supply voltage aligns with the system power rails.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the MAX31C80/MAX31D80 family of spread-spectrum clock generators. While the MAX31C80 provides center-dithering capabilities, the MAX31D80 specifically produces down-dithered outputs. Both share identical pinouts, packages, and electrical characteristics, differing primarily in their modulation type and factory settings.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The MAX31C80T-UGQ+ serves as a functional substitute if center-dithering is acceptable. Other frequencies within the 2MHz to 134MHz range are available by selecting different ordering suffixes from the manufacturer's selector guide.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum spread-spectrum magnitude for the MAX31D80?

The MAX31D80 can generate down-dithered magnitudes up to -3%, selected via the SMSEL0 and SMSEL1 pins.

How does the device handle the input clock signal?

The device accepts an 8MHz to 134MHz clock or an 8MHz to 34MHz crystal at the X1 pin. It also provides a buffered version of this input signal on the separate XOUT pin.

What are the requirements for changing the dither magnitude?

A power cycle is required after any change to the SMSEL0 or SMSEL1 pin states for the new dither magnitude configuration to take effect.