LMK61E2-I4SIAR

Overview

The LMK61E2-I4SIAR is an ultra-low jitter fully programmable oscillator from Texas Instruments, featuring a PLLatinum fractional-N frequency synthesizer and integrated VCO. It supports output configurations of LVPECL, LVDS, or HCSL. The device operates within a supply voltage range of 3.135V to 3.465V and delivers a maximum output frequency of 900 MHz. It includes on-chip EEPROM for self-startup at factory-programmed settings, such as 156.25MHz LVPECL. The component provides internal power regulation for high PSRR and I2C serial interface programming for fine and coarse frequency adjustments.

Feature Summary

• Integrates a fractional-N frequency synthesizer with a built-in VCO for compact clock generation
• Features on-chip EEPROM enabling self-startup from factory-programmed default outputs
• Supports system design verification through I2C-controlled fine and coarse frequency margining options

Applications

• Medical imaging systems requiring precise timing references
• Test and measurement equipment demanding low phase noise
• High-speed data converter clock distribution networks

Procurement Notes

Verify the specific suffix 'I4' against the official datasheet to confirm the exact出厂配置频率 and output format, as variations exist within the LMK61E2 family. Ensure the operating temperature grade matches the industrial specification (-40°C to +85°C) required for your application environment. Cross-reference the package marking with the 8-QFM physical dimensions to prevent integration errors during PCB assembly.

Selection Notes

Select this model when a fully programmable solution with integrated VCO is preferred over fixed-frequency crystals. The I2C interface allows for dynamic frequency adjustment, making it suitable for systems requiring multiple clock standards. Consider the 8-QFM surface mount package for space-constrained designs. Verify that the required output swing (LVPECL, LVDS, or HCSL) aligns with the downstream receiver inputs without additional level shifting.

Part Context

This component belongs to the LMK61xx series of ultra-low jitter oscillators designed by Texas Instruments. It serves as a direct replacement for traditional crystal oscillators in applications requiring flexible frequency synthesis. The device simplifies board layout by integrating the PLL and VCO, reducing the need for external components typically associated with discrete frequency generation circuits.

Replacement Considerations

LMK61E2-SIAT: Confirmed substitute part number offering identical functionality and pinout with different packaging configuration.