LMK5B33216RGCR

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMK5B33216 is a network synchronizer and jitter cleaner designed for Ethernet-based networking applications. It integrates three Digital Phase Locked Loops (DPLLs) and three Analog Phase Locked Loops (APLLs), with APLL3 utilizing Bulk Acoustic Wave (BAW) technology to achieve ultra-low jitter performance, such as 42fs typical RMS at 312.5MHz. The device provides two differential or single-ended reference inputs supporting frequencies from 1Hz to 800MHz and sixteen programmable differential outputs capable of generating frequencies up to 1250MHz. It supports multiple output formats including AC-LVPECL, LVDS, HSDS, and HSCL, ensuring compliance with PCIe Gen 1 to 7 standards.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates three DPLLs paired with three APLLs, including a high-performance BAW VCO in APLL3, to provide hitless switching and jitter attenuation with programmable loop bandwidth.
• Features two reference inputs that support digital holdover and automatic hitless switching upon detection or loss of input signals.
• Provides sixteen differential outputs with programmable swing and common mode voltage, supporting various logic formats like AC-LVPECL, LVDS, and HSDS.
• Includes reference validation circuitry and Zero-Delay Mode (ZDM) to control the phase relationship between inputs and outputs.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Wired networking inter/intra data center interconnects
• Timing cards, line cards, and fixed cards for telecom infrastructure
• Jitter cleaning and reference clock generation for 112G/224G PAM-4 SerDes
• 100G-800G data center switches and core routers
• Smart Network Interface Cards (NIC) for data center computing

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and temperature range compatibility. Confirm that the component meets all required industry standards and specifications for your target application before finalizing procurement decisions.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this device when stringent timing accuracy (< 5ns) and ultra-low jitter are critical for Ethernet-based networking. Consider the integrated BAW VCO for superior phase noise performance compared to conventional LC VCOs. Ensure the system design accommodates the required power supply voltages and thermal management for the VQFN package.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMK5B33216 belongs to Texas Instruments' LMK5B series of network synchronizers. It is positioned alongside variants like the LMK5C33216A and LMK5D33414, distinguished by its specific integration of BAW technology in one APLL and its configuration of two inputs and sixteen outputs.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMK5C33216A: Similar I/O count but lacks BAW VCO and IEEE 1588 PTP stack software.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum output frequency supported by the LMK5B33216?

The device supports output frequencies ranging from 1Hz (1PPS) up to 1250MHz.

How does the device handle reference input failure?

Reference validation circuitry monitors the DPLL reference inputs and automatically performs a hitless switch when inputs are detected or lost.

What programming interfaces are available for configuring the device?

The device is fully programmable through I2C, 3-wire SPI, or 4-wire SPI interfaces.