LMK61E2BAA-SIAR

Overview

The LMK61E2BAA-SIAR is an ultra-low jitter fully programmable oscillator from Texas Instruments, featuring an integrated PLLatinum frequency synthesizer and VCO. It supports output configurations of LVPECL, LVDS, or HCSL with a maximum frequency of 900 MHz. The device utilizes an internal EEPROM for self-startup at factory-programmed settings, such as 156.25 MHz LVPECL. Configuration is managed via an I2C serial interface, which also provides fine and coarse frequency margin options for design verification. It operates within a voltage range of 3.135 V to 3.465 V and functions between -40°C and +85°C in an 8-QFM package.

Feature Summary

• Integrates a PLLatinum programmable oscillator with a built-in VCO for common reference clock generation.
• Features internal EEPROM for self-startup capability using factory-programmed output settings.
• Supports system-in-system programming via I2C interface for complete register and configuration control.
• Includes internal power regulation to provide high power supply ripple rejection ratio.

Applications

• Medical imaging systems
• Test and measurement equipment
• High-speed data converter clocking
• Telecommunications infrastructure

Procurement Notes

Verify the specific ordering suffix against the official Texas Instruments datasheet to ensure compatibility with required output formats and pre-programmed frequencies. Confirm that the SIA package variant matches the intended PCB footprint and thermal requirements. Cross-reference the part number with the latest product release notes to validate current manufacturing status and any potential pinout or electrical specification updates.

Selection Notes

Select this component when ultra-low jitter performance is critical for system timing integrity. Ensure the application requires the specific output logic levels supported by the device, such as LVPECL or LVDS. Consider the benefit of internal EEPROM for reducing external configuration components and simplifying startup sequences. Verify that the I2C interface aligns with the host controller's capabilities for dynamic frequency adjustment if needed.

Part Context

This part belongs to the LMK61E2 family of ultra-low jitter programmable oscillators designed for demanding applications. It shares core architecture features with other variants in the series, differing primarily in pre-programmed frequency settings and output configurations stored in the internal EEPROM. The family is optimized for providing clean clock signals to high-performance analog-to-digital converters and digital-to-analog converters.

Replacement Considerations

Direct substitutes include other LMK61E2 variants with different pre-programmed frequencies, such as LMK61E2BBA-SIAR. Ensure replacement parts maintain the same QFM package and operational temperature range. Verify that the alternative part's factory-programmed output matches the system's required clock frequency and signal format without requiring hardware changes.