LMK61E2BBA-SIAT

Overview

The LMK61E2BBA-SIAT is an ultra-low jitter programmable oscillator from Texas Instruments, featuring a PLLatinum™ frequency synthesizer and integrated VCO. It supports output frequencies from 10 MHz to 1 GHz with configurable LVPECL, LVDS, or HCSL outputs. The device utilizes an internal EEPROM for factory-configured self-startup at 156.25 MHz LVPECL. Key electrical parameters include a maximum output frequency of 1 GHz, a jitter specification of 90 fs, and a supply voltage range of 3.135 V to 3.465 V. Operating current ranges from 136 mA (disabled) to 208 mA (active). It operates within a temperature range of -40°C to +85°C in an 8-QFM package.

Feature Summary

• Integrates a PLLatinum™ fractional-N frequency synthesizer with an on-chip VCO for precise clock generation.
• Supports fully programmable I2C interface for system-in-system configuration and verification testing.
• Features high power supply rejection ratio (PSRR) via internal power regulation to reduce network complexity.
• Provides factory-programmable EEPROM for immediate startup without external initialization.

Applications

• High-speed data converter reference clocks
• Telecommunications base station synchronization
• Test and measurement equipment timing sources

Procurement Notes

Verify the specific suffix 'SIAT' against the manufacturer's official ordering guide to ensure correct packaging and tape/reel specifications. Confirm that the factory-configured frequency matches the design requirement, as this variant is pre-programmed. Check for any recent product change notices regarding pinout or thermal characteristics before finalizing procurement.

Selection Notes

Select this component when ultra-low jitter performance below 100 fs is critical for system signal integrity. Ensure the application requires one of the supported differential output standards: LVPECL, LVDS, or HCSL. Consider the I2C programming capability if dynamic frequency adjustment or system-level timing margin testing is required during development.

Part Context

This part belongs to the LMK61E2 family of ultra-low jitter programmable oscillators. It shares architectural similarities with other members like the LMK61E2-SIAT but differs in specific factory programming and potentially minor electrical tolerances. It serves as a direct replacement for fixed-frequency oscillators where programmability and lower jitter are needed.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer's cross-reference tools for compatible alternatives within the same jitter class.

FAQ

What is the default output configuration upon power-up?

The device is factory programmed to generate a 156.25 MHz LVPECL output using settings stored in the on-chip EEPROM, allowing for immediate operation without external initialization.

How is the device configured after manufacturing?

While factory-configured for self-startup, the registers and EEPROM can be fully reprogrammed in-system via the I2C serial interface to support different frequencies and output formats.