LMK61E2BAA-SIAT

Overview

The LMK61E2BAA-SIAT is an ultra-low jitter fully programmable oscillator from Texas Instruments, featuring a PLLatinum fractional-N frequency synthesizer and integrated VCO. It supports output frequencies up to 1 GHz with a typical jitter of 90 fs. The device offers configurable LVPECL, LVDS, or HCSL outputs and includes factory-programmed EEPROM for self-startup at 156.25 MHz LVPECL. It operates on a single 3.3V supply within a -40°C to +85°C temperature range, housed in an 8-QFM package.

Feature Summary

• Integrates a PLLatinum fractional-N frequency synthesizer with an internal VCO for precise clock generation.
• Features factory-programmed EEPROM enabling self-startup functionality without external configuration.
• Provides flexible differential output options including LVPECL, LVDS, and HCSL formats.
• Includes I2C serial interface for system-in-field programming and fine/coarse frequency tuning.

Applications

• Medical imaging systems requiring precise timing synchronization
• Test and measurement equipment demanding low phase noise
• High-speed data acquisition systems
• Telecommunications infrastructure components

Procurement Notes

Verify the specific suffix 'SIA' corresponds to the 8-QFM surface-mount package and standard operating voltage range. Confirm that the factory-programmed frequency matches the target application requirements, as the EEPROM content is fixed at shipment. Ensure compatibility with I2C bus voltage levels for system integration.

Selection Notes

Select this component when ultra-low jitter performance near 100 fs is critical for system signal integrity. Choose the LMK61E2BAA-SIAT over generic oscillators if programmability via I2C is required for design flexibility. Consider the 8-QFM footprint constraints and the need for a single 3.3V power supply during board layout planning.

Part Context

This part belongs to the LMK61E2 family of ultra-low jitter programmable oscillators. It shares the core PLLatinum architecture with other variants like LMK61E2-SIAT but differs in specific factory programming and package configurations. It serves as a direct replacement for fixed-frequency crystal oscillators in high-performance applications.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout compatibility and thermal characteristics when considering alternative manufacturers' devices.

FAQ

What is the default output format upon power-up?

The device is factory programmed to generate a 156.25 MHz LVPECL output by default using its onboard EEPROM.

How is the device configured after manufacturing?

Configuration is managed through an I2C serial interface, allowing for full in-system programming of registers and frequency settings.