LMK61E2BBA-SIAR

Overview

The LMK61E2BBA-SIAR is an ultra-low jitter fully programmable oscillator from Texas Instruments, featuring a PLLatinum™ fractional-N frequency synthesizer with an integrated VCO. It supports output configurations of LVPECL, LVDS, or HCSL and operates within a frequency range of 10 MHz to 1 GHz. The device includes internal EEPROM for self-startup at factory-programmed settings, such as 156.25 MHz LVPECL. It offers ±50 ppm frequency stability and functions between -40°C and +85°C. Power supply voltage ranges from 3.135 V to 3.465 V, with maximum operating currents up to 208 mA. The component utilizes an I²C serial interface for in-system programming and provides fine/coarse frequency tuning options.

Feature Summary

• Integrates a fractional-N frequency synthesizer with a built-in VCO for generating precise reference clocks.
• Features internal EEPROM for automatic startup using factory-configured parameters without external initialization.
• Supports complete in-system programming via an I²C serial interface for flexible configuration.
• Provides high power supply ripple rejection ratio (PSRR) through internal power regulation.

Applications

• Generating common reference clocks for high-speed data converters
• System timing margin testing and design verification tests (DVT)
• Standard compliance testing in communication infrastructure

Procurement Notes

Verify the specific suffix 'BBA' against the manufacturer's official documentation to confirm the exact factory-programmed output frequency and format, as this variant determines the default operational state upon power-up. Ensure compatibility with the required output logic levels (LVPECL, LVDS, or HCSL) specified in the final design requirements. Cross-reference the package marking with the 8-QFM physical dimensions to prevent assembly errors during surface mount placement.

Selection Notes

Select this component when ultra-low jitter performance is critical for system integrity. The integrated VCO eliminates the need for external resonators, simplifying the PCB layout. Consider the I²C configurability if multiple clock frequencies are needed across different production batches. Verify that the 3.3V nominal supply aligns with the available power rails in the target application environment.

Part Context

This part belongs to the LMK61xx series of ultra-low jitter oscillators designed by Texas Instruments. It shares architectural similarities with the LMK61E2 but differs in specific factory programming and suffix designations. The series is characterized by its silicon-based VCXO technology and compact 8-SMD module packaging, targeting applications requiring precise timing solutions in space-constrained designs.

Replacement Considerations

The LMK61E2-SIAT is a related variant within the same family offering similar programmability and output options. Verify functional equivalence regarding the specific output frequency and format before substitution, as factory programming may differ between suffixes. Consult the official replacement guide for any pin-compatible alternatives within the LMK61xx lineup.