SI5351A-B01975-GT

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5351A-B01975-GT is a factory preprogrammed I2C programmable clock generator from Skyworks Solutions. It provides three LVCMOS outputs in an MSOP-10 package, generating frequencies up to 200 MHz with 0 ppm error using a 25 or 27 MHz crystal reference. The device operates on a core supply voltage of 2.25 V to 3.6 V and consumes 22 mA at 25 °C. It features low period jitter of 70 ps typical, supports static phase offset, and includes configurable spread spectrum capabilities.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates multiple non-integer-related frequencies with zero frequency synthesis error
• Configurable spread spectrum modulation selectable at each output
• Supports static phase offset and glitchless frequency changes
• Separate voltage supply pins provide level translation flexibility

Clock Generators, PLLs, Frequency Synthesizers Applications

• XO replacement in cost-sensitive designs
• Audio/video equipment and gaming systems
• Printers, scanners, and projectors
• Residential gateways and networking communication devices

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory preprogrammed configuration associated with the B01975 suffix before integration. Confirm that the required output frequencies match the internal RAM settings, as these parameters cannot be modified via I2C after manufacturing. Ensure the external crystal matches the specified 25 or 27 MHz reference requirement for proper operation.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when a fixed set of asynchronous clock frequencies is required without runtime reconfiguration. The Si5351A variant relies solely on an external crystal reference rather than an internal VCXO or external CLKIN input. Verify that the three-output MSOP-10 package meets the board space constraints compared to the four or eight-output QFN options.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5351 family of I2C-programmable CMOS clock generators. The 'A' designation indicates it uses an internal oscillator driven by an external crystal, distinguishing it from the 'B' (VCXO) and 'C' (CLKIN) variants. The 'GT' suffix denotes tape and reel packaging for surface-mount assembly.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

SI5351A-B-GT

Clock Generators, PLLs, Frequency Synthesizers FAQ

Can the output frequencies be changed after the device is manufactured?

No, the B01975 suffix indicates a factory preprogrammed part. The configuration is stored in internal RAM and cannot be altered via I2C.

What type of reference does the Si5351A require?

The Si5351A requires a standard fixed-frequency AT-cut crystal, typically 25 MHz or 27 MHz, connected to the XA and XB pins.

Does this device support synchronous clock generation?

No, the Si5351A generates free-running clocks based on its internal oscillator. Synchronous generation relative to an external source requires the Si5351C variant.