MAX9476EUG

Clock Generators, PLLs, Frequency Synthesizers Overview

The MAX9476EUG is a low-cost, high-performance clock synthesizer designed for systems requiring an 8kHz input reference clock. It generates six buffered LVTTL clock outputs at 35.328MHz using an internal phase-lock loop (PLL) and voltage-controlled crystal oscillator (VCXO). The device operates on a single +3V to +3.6V supply with typical power consumption of 16mA. Key electrical parameters include a typical output jitter of 4ps RMS, a frequency accuracy of ±25ppm, and a VCXO pulling range of ±100ppm. It features a shutdown mode drawing 7.5µA and includes an 8kHz reference clock relay output.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates six identical buffered LVTTL clock outputs at 35.328MHz from an 8kHz reference input
• Internal PLL locks to the 8kHz reference with a ±100ppm pulling range via external VCXO
• Low-jitter performance with 4ps RMS typical output jitter and high-jitter rejection on the reference clock
• Includes one 8kHz reference clock relay output (REO) with jitter suppression

Clock Generators, PLLs, Frequency Synthesizers Applications

• Telecom equipment utilizing T1, E1, T3, E3, and ISDN protocols
• xDSL equipment in central offices with interface to telecom protocols

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the package code U24-1 corresponds to the 24-pin TSSOP form factor. Confirm the temperature range is -40°C to +85°C. Ensure the datasheet revision matches the required specifications for the design. Check for RoHS compliance status if environmental regulations apply to the target assembly process.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a stable 35.328MHz clock is derived from an 8kHz reference source. Ensure the external crystal meets the 14pF load capacitance requirement and oscillates on its fundamental mode. Verify that the application can accommodate the 24-pin TSSOP footprint and provides adequate bypassing for VDD and VDDP pins to maintain signal integrity.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The MAX9476EUG belongs to the MAX9476 family of clock synthesizers manufactured by Analog Devices Inc./Maxim Integrated. It is specifically engineered for telecom applications requiring precise frequency synthesis from low-frequency references. The 'E' suffix indicates the extended industrial temperature range, while 'U' denotes the TSSOP package type.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Refer to the MAX9486 data sheet if lower value external crystals are required for the VCXO configuration. No direct pin-compatible substitutes are listed in the provided documentation.