LMK5B12204RGZR

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMK5B12204 is a network synchronizer and jitter cleaner designed for Ethernet-based networking applications. It integrates one Digital Phase-Locked Loop (DPLL) and two Analog Phase-Locked Loops (APLLs). APLL1 utilizes a Bulk Acoustic Wave (BAW) VCO to generate ultra-low jitter clocks, achieving typical RMS jitter of 32fs at 312.5MHz and 44fs at 156.25MHz with a 4MHz high-pass filter. The device features two differential or single-ended DPLL inputs supporting frequencies from 1Hz to 800MHz, and four programmable differential outputs capable of up to 1250MHz. Output formats include AC-LVPECL, AC-CML, AC-LVDS, HCSL, and 1.8V LVCMOS. It operates on a 3.3V core supply and 1.8V/2.5V/3.3V output supplies within a -40°C to +85°C temperature range.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates one DPLL and two APLLs with a BAW VCO for ultra-low jitter performance
• Supports hitless switching and jitter attenuation via programmable loop bandwidths
• Provides four flexible differential outputs with multiple voltage standards
• Includes internal EEPROM for custom system configuration on start-up

Clock Generators, PLLs, Frequency Synthesizers Applications

• SyncE (G.8262), SONET/SDH, and IEEE 1588 PTP secondary clock synchronization
• Jitter cleaning and reference clock generation for 56G/112G PAM4 SerDes
• Timing cards, line cards, and fixed cards in wired networking infrastructure
• Data center switches, core routers, edge routers, and Smart NICs
• Optical Transport Networks (OTN G.709) and broadband fixed line access

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix RGZR against the manufacturer's current orderable addendum to confirm package type and reel specifications. Ensure the component meets the required operating temperature range of -40°C to +85°C for your application environment. Confirm that the power delivery network supports the specified core and output supply voltages before integration.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this device when ultra-low jitter is critical for Ethernet networking applications. The integrated BAW VCO eliminates the need for external low-jitter oscillators in many designs. Consider the available output formats and the ability to mix supply voltages across output channels. Verify that the DPLL loop bandwidth requirements align with the 1mHz to 4kHz programmable range for your specific synchronization needs.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMK5B12204 belongs to the LMK5B family of network synchronizers from Texas Instruments. It is part of a series designed to meet stringent timing requirements for modern data center and telecommunications infrastructure. The device complements other components like the LMX2594 and ADC12DJ5200 in complex clocking architectures.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The LMK05318B is a comparable device within the same family offering eight outputs instead of four. Evaluate pin compatibility and register settings if substituting between these models. Check the datasheet for differences in output drive capabilities and thermal performance.