SI5512D-B15676-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5512D-B15676-GMR is a 12-output variant of the Si5518 device, designed for wireless network synchronization applications. It supports LTE-A and 5G Remote Radio Units (RRU) with IEEE 1588/ SyncE functionality. The device features an RFPLL generating low phase noise CPRI clocks and DSPLLs for network synchronization. Key electrical parameters include integer output frequencies up to 1.2288 GHz and fractional output frequencies up to 650 MHz. Typical ultra-low jitter is 47 fs RMS. Phase noise specifications are –164 dBc/Hz at the noise floor and –145 dBc/Hz at an 800 kHz offset for a 491.52 MHz carrier. Spurs are less than –95 dBc at 122.88 MHz. The device operates from core voltages of 3.3 V and 1.8 V, with output driver supply voltages (VDDO) of 3.3 V, 2.5 V, or 1.8 V.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Utilizes fifth-generation DSPLL and MultiSynth technologies for ultra-high-performance clock generation.
• Supports JESD204B/C Subclass 0 and 1 standards for synchronized clock generation.
• Features programmable loop bandwidths ranging from 1 mHz to 4 kHz for independent network synchronization.
• Provides hitless input clock switching with automatic or manual control.

Clock Generators, PLLs, Frequency Synthesizers Applications

• LTE-A and 5G Remote Radio Units (RRU)
• JESD204B/C clock generation
• IEEE 1588 slave clocks (T-TSC) and Telecom Boundary Clocks (T-BC)
• Remote Access Networks (RAN), picocells, and small cells

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. Confirm availability status directly with authorized distributors as stock levels fluctuate. Ensure compliance with RoHS requirements if applicable to your manufacturing process. Cross-reference the datasheet revision date with your design timeline to account for potential specification updates.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when split-board architectures are required between digital and RF functions in massive MIMO systems. Verify that the 12-output configuration meets system timing requirements without needing the full 18-output capabilities of the Si5518. Ensure host processor compatibility for optional AccuTime IEEE 1588 software implementation. Check voltage domain compatibility for LVDS, LVPECL, and LVCMOS outputs across different board sections.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The SI5512D-B15676-GMR belongs to the Skyworks Si551x family of NetSync low phase noise jitter attenuating clocks. It serves as a specialized subset of the broader Si5518 series, tailored for applications where RF-specific features like VCXO phase noise references are unnecessary. This positioning allows for optimized cost and complexity in digital-heavy synchronization nodes within modern cellular infrastructure.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The Si5518 is the parent device offering additional RF functionalities. Direct pin-compatible alternatives within the same family should be evaluated based on specific output count and feature requirements. No other direct substitute part numbers are confirmed in public documentation.