Skyworks Solutions Inc. SI5380A-D07754-GM

Overview

SI5380A-D07754-GM from Skyworks Solutions is a 12-output, integer-based JESD204B jitter attenuator and clock multiplexer optimized for wireless infrastructure. It delivers ultra-low phase noise (–159 dBc/Hz floor), 65 fs RMS jitter (12 kHz–20 MHz), and supports DCLK/SYSREF generation for Subclass 0 and 1. Its DSPLL architecture eliminates external VCXO and analog loop filters, operating in freerun, locked, or holdover modes with automatic input switching - deployed in small cell RRUs and LTE-A base stations.

For engineers reviewing the SI5380A-D07754-GM datasheet, SI5380A-D07754-GM pinout, SI5380A-D07754-GM application, or SI5380A-D07754-GM equivalent, key selection considerations include JESD204B SYSREF phase matching, hitless/ramped input switching behavior, DSPLL loop bandwidth configurability (0.1 Hz–100 Hz), and 54 MHz crystal reference dependency for holdover stability.

Technical Context

The SI5380A-D07754-GM implements Skyworks' 4th-generation DSPLL with a 15 GHz VCO, programmable digital loop filter, and integer-N synthesis. It accepts four inputs (differential or LVCMOS) and routes them through a configurable crosspoint to twelve outputs, each with independent R-divider and signal format control (LVDS/LVPECL/LVCMOS).

Its all-digital architecture enables deterministic jitter attenuation, zero-delay mode, and status monitoring (LOS/OOF/LOL). The device uses an internal oscillator driven by a 54 MHz fundamental-mode crystal (8 pF load) for freerun and holdover timing - no external capacitors required - and supports I²C/SPI configuration with on-chip OTP memory.

Key Specifications

Pinout & Package

SI5380A-D07754-GM is housed in a 64-pin QFN package (9 mm × 9 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Skyworks Si5380 Rev D datasheet Section 9 (Pin Description) and Figure 9.1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar jitter attenuator applications.

Compared with SI5380A-D07754-GM, the Si5386A-D08584-GM adds programmable SYSREF phase offset but increases complexity and cost; the LTC6957IUF-3#PBF offers faster lock time and lower power but lacks holdover, crystal integration, and JESD204B-specific features - making SI5380A-D07754-GM optimal for legacy wireless infrastructure with strict jitter and availability requirements.

Availability

SI5380A-D07754-GM is available at Aetrix Electronics and suitable for wireless infrastructure, small cell base stations, and JESD204B data converter timing requiring stable component supply across extended product lifecycles.

Supply support for SI5380A-D07754-GM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Skyworks Solutions is a U.S.-based semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, automotive, and industrial markets.

The Si5380 family was designed specifically for high-integration, ultra-low-jitter clock generation in wireless infrastructure - addressing phase noise, holdover stability, and JESD204B timing compliance in 4G/LTE and 5G small cells.

FAQ

What is the primary function of the SI5380A-D07754-GM in wireless base station designs?

The SI5380A-D07754-GM serves as a jitter-attenuating clock multiplexer that generates ultra-low-jitter, phase-aligned JESD204B DCLK and SYSREF signals for ADCs/DACs in RRUs and macrocells. Its DSPLL architecture locks to reference inputs or operates freerun using a 54 MHz crystal, ensuring timing integrity during input failures via holdover mode - a core requirement in 3GPP-compliant wireless infrastructure where SI5380A-D07754-GM replaces discrete VCXO + PLL solutions.

Does the SI5380A-D07754-GM support JESD204B Subclass 1 with independent SYSREF phase adjustment?

No. The SI5380A-D07754-GM supports JESD204B Subclass 0 and Subclass 1 only for phase-matched DCLK/SYSREF pairs generated from the same Multisynth. Independent SYSREF phase adjustment is not implemented in SI5380A-D07754-GM; that capability is provided by the newer Si5386A-D08584-GM. For new designs requiring dynamic SYSREF skew tuning, SI5380A-D07754-GM is not suitable.

What crystal specifications are required for the SI5380A-D07754-GM XA/XB interface?

The SI5380A-D07754-GM requires a 54 MHz fundamental-mode crystal with ±100 ppm total accuracy (including temp, voltage, aging), 8 pF load capacitance, and ESR ≤ 40 Ω. The device integrates internal 8 pF load capacitors - no external capacitors are needed. Using an external XO instead of a crystal is possible but degrades output jitter performance due to added reference phase noise, as documented in the Si5380 Rev D datasheet Section 3.2.

How does the SI5380A-D07754-GM handle input clock failure during operation?

Upon input clock failure, the SI5380A-D07754-GM automatically enters holdover mode using a programmable 120-second historical frequency average to minimize phase disturbance. The final holdover frequency is computed from a user-defined window within that history, with optional ramped exit when a valid input returns. This behavior - confirmed in Section 3.1.10 of the Si5380 Rev D datasheet - ensures continuous, low-drift timing for critical wireless functions without requiring external supervision.

Is the SI5380A-D07754-GM pin-compatible with other Si5380 variants such as the SI5380A-D-GM?

Yes. The SI5380A-D07754-GM shares the identical 64-QFN 9×9 mm package and pinout with all Si5380A-D-x-GM variants, including the base SI5380A-D-GM. Differences lie solely in factory-programmed configuration (e.g., output frequencies, loop bandwidth, input priorities) stored in OTP memory - hardware compatibility is maintained across the Si5380A-D family, enabling drop-in replacement for preconfigured timing solutions.