LMK5C33216ARGCT

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMK5C33216A is a network synchronizer and jitter cleaner featuring three Digital Phase-Locked Loops (DPLLs) paired with Analog Phase-Locked Loops (APLLs). It includes two differential or single-ended reference inputs supporting frequencies from 1Hz to 800MHz. The device provides sixteen programmable differential outputs, capable of generating up to twenty total frequency outputs when utilizing GPIO pins for LVCMOS signals. Output formats include HSDS, AC-LVPECL, LVDS, and HSCL, with frequencies ranging from 1Hz to 1250MHz. A proprietary Bulk Acoustic Wave (BAW) VCO in APLL3 delivers ultra-low jitter performance, specified at 40fs typical RMS jitter at 491.52MHz. The component operates within a temperature range of -40°C to +85°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates three DPLLs and three APLLs for hitless switching and jitter attenuation with programmable loop bandwidth.
• Features a BAW-based APLL3 providing ultra-low phase noise and jitter performance independent of reference input characteristics.
• Supports digital holdover and automatic hitless switching through reference validation circuitry.
• Offers flexible output configurations with multiple programmable signal formats and support for SYSREF/1-PPS generation.

Clock Generators, PLLs, Frequency Synthesizers Applications

• 4G and 5G Wireless Networks including Active Antenna Systems (AAS), mMIMO, and Remote Radio Units (RRU)
• SyncE, SONET/SDH, and IEEE-1588 PTP secondary clock synchronization
• Jitter cleaning and reference clock generation for high-speed SerDes applications

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and electrical specifications. Confirm that the required firmware version matches the system design requirements, particularly regarding the presence or absence of the integrated IEEE 1588 PTP stack software. Cross-reference the part number with the latest datasheet revision history to account for any functional updates or pinout changes.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component for designs requiring precise synchronization across multiple domains with stringent jitter constraints. The inclusion of a BAW VCO makes it suitable for wireless infrastructure where low phase noise is critical. Ensure the application utilizes the available DPLL and APLL resources efficiently, as the device supports up to three synchronized domains. Verify that the output driver capabilities meet the load requirements of the connected downstream components.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This device belongs to the LMK5C series of network synchronizers designed for demanding communication infrastructure. It serves as a central timing solution for baseband units and radio access networks. The architecture allows for flexible clock distribution and regeneration, addressing the complex timing needs of modern cellular standards and optical transport networks.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMK5C33216AS1: Includes integrated IEEE 1588 PTP stack software; verify if protocol handling is required.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum output frequency supported by the LMK5C33216A?

The device supports output frequencies up to 1250MHz across its differential output channels.

How does the BAW APLL improve performance compared to conventional VCOs?

The BAW APLL generates ultra-low jitter clocks (e.g., 40fs typical at 491.52MHz) regardless of the DPLL reference input frequency and jitter characteristics.

Can the device perform hitless switching between reference inputs?

Yes, the reference validation circuitry monitors DPLL reference inputs and automatically performs hitless switching when inputs are detected or lost.