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Skyworks Solutions Inc. SI5512D-B15669-GM
- Part No.:
- SI5512D-B15669-GM
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- 72-VFQFN Exposed Pad
- Datasheet:
-
SI5512D-B15669-GM.pdf
- Description:
- Linear IC's
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SI5512D-B15669-GM from Skyworks Solutions is a 12-output network synchronization clock IC supporting IEEE 1588v2, SyncE, and eCPRI for 5G wireless infrastructure. It integrates two independent DSPLLs with 1 ppt DCO resolution, RFPLL for CPRI clocks, and PPSPLL for instant 1PPS/PP2S lock. Typical RMS jitter is 47 fs at 491.52 MHz, and it supports ITU-T G.8273.2 (T-TSC/T-BC), G.8273.4 (T-BC-P/A), and G.8262.1 (eEEC) compliance in massive MIMO digital board applications.
For engineers reviewing the SI5512D-B15669-GM datasheet, SI5512D-B15669-GM pinout, SI5512D-B15669-GM application, or SI5512D-B15669-GM equivalent, key selection criteria include dual DSPLL architecture with hitless switching, programmable loop bandwidth (1 mHz–4 kHz), JESD204B/C DCLK/SYSREF pair support, ultra-low phase noise (–164 dBc/Hz noise floor), and 72-QFN 10×10 mm package with 6 inputs and 12 configurable outputs.
Technical Context
The SI5512D-B15669-GM implements three distinct PLL domains: RFPLL for high-frequency CPRI clock generation up to 1.2288 GHz with ultra-low phase noise; two fully independent DSPLLs for Ethernet fronthaul synchronization with adjustable DCO and automatic Free-Run/Holdover/Locked state transitions; and PPSPLL optimized for sub-25 mHz loop bandwidth and programmable phase pull-in rate for precise 1PPS/PP2S alignment.
It supports multi-reference jitter attenuation with selectable bandwidth (10 Hz–4 kHz), output-to-output static delay tuning (±10 ns), and skew control (±50 ps). Clock outputs are configurable as DCLK, SYSREF, or general-purpose clocks across LVDS, LVPECL, LVCMOS, HCSL, and CML standards, with independent VDDO supply rails (1.8 V/2.5 V/3.3 V) per bank.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RMS Jitter | 47 fs typical (12 kHz–20 MHz, 491.52 MHz carrier); enables JESD204B/C Subclass 1 timing margin compliance |
| Phase Noise Floor | –164 dBc/Hz at 491.52 MHz; critical for EVM-sensitive 5G RRH transmit paths |
| DCO Resolution | 1 ppt (10–15) in DSPLLs; meets ITU-T G.8273.2 T-TSC phase accuracy requirement |
| Output Count & Type | 12 programmable outputs (LVDS/S-LVDS/LVPECL/LVCMOS/HCSL/CML); supports up to six DCLK/SYSREF pairs |
| Input Support | 6 inputs: differential (8 kHz–1 GHz), CMOS (1PPS/PP2S/8 kHz–250 MHz); enables multi-source redundancy |
| Compliance Standards | ITU-T G.8273.2 (T-TSC/T-BC), G.8273.4 (T-BC-P/A), G.8262.1 (eEEC), G.8261 (TC12-17); validated for O-RAN fronthaul |
| Package | 72-QFN, 10×10 mm, 0.5 mm pitch, exposed thermal pad; supports high-density RAN board layouts |
Pinout & Package
SI5512D-B15669-GM is housed in a 72-lead QFN package (10×10 mm, 0.5 mm pitch) with an exposed thermal pad. Pinout follows JEDEC MO-220 outline and IPC-7351 land pattern guidelines, supporting reflow-compatible assembly with NSMD pads and 0.125 mm stencil thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA_3P3 | Analog core supply | 3.3 V ±5 % for RFPLL and DSPLL analog blocks; decoupling required per datasheet layout rules |
| VDDD_1P8 | Digital core supply | 1.8 V ±5 % for digital logic and I²C/SPI interface; separate from VDDA to reduce noise coupling |
| VDDOx (x=1–12) | Output driver supply | Configurable 1.8 V/2.5 V/3.3 V per output bank; enables mixed-signaling on single device |
| CLKIN0–CLKIN5 | Differential/CMOS clock inputs | Supports 1PPS, PP2S, SyncE, and reference clocks; automatic hitless switching with <150 ps phase transient |
| SCL/SDA or SCLK/MOSI/MISO/SS# | I²C or SPI serial interface | Configures all PLLs, outputs, and status monitors; supports field updates without hardware change |
| OUT0–OUT11 | Programmable clock outputs | Each configurable as DCLK, SYSREF, or system clock; ±10 ns static delay and ±50 ps skew control |
| LOS/OOF/PHMON/FLOL/PLOL | Status monitor outputs | Real-time fault detection for input loss, frequency offset, phase monitoring, and PLL lock status |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent DSPLLs | Enables simultaneous IEEE 1588 boundary clock (T-BC) and telecom slave clock (T-TSC) operation on same silicon |
| RFPLL with –164 dBc/Hz Noise Floor | Meets stringent phase noise requirements for 5G NR FR1/FR2 remote radio head transmit chains |
| PPSPLL with 1 mHz–25 mHz Loop Bandwidth | Provides sub-microsecond time alignment for 1PPS/PP2S inputs in precision timing applications |
| JESD204B/C SYSREF Pulser Mode | Generates deterministic, low-jitter SYSREF pulses synchronized to DCLK for multi-device deterministic latency |
| Hitless Input Switching | Preserves phase continuity during reference source failover; essential for SyncE and PTP network resilience |
| AccuTime™ Software Compatibility | Enables full IEEE 1588v2 servo algorithm and protocol stack execution on host processor, offloading timing intelligence |
Applications
| 5G Massive MIMO Digital Board | IEEE 1588 Telecom Boundary Clock (T-BC) |
|---|---|
Use Scenario: Digital baseband processing board in split-architecture massive MIMO systems, requiring precise phase-aligned clocks for FPGA-based beamforming and data transport. IC Role / Device Role / Timing Role: Primary network synchronizer generating 12 low-jitter clocks-six DCLK/SYSREF pairs for JESD204B/C links to RF cards and auxiliary clocks for baseband processors. Use Value: Enables physical separation of digital and RF PCBs while maintaining <100 ps inter-card skew via deterministic SYSREF distribution and DSPLL holdover stability. |
Use Scenario: Centralized timing node in mobile fronthaul aggregation, synchronizing multiple RUs and backhaul interfaces using SyncE and PTP. IC Role / Device Role / Timing Role: ITU-T G.8273.2-compliant T-BC delivering traceable frequency and phase to downstream T-TSC devices over Ethernet. Use Value: Meets ±50 ns max time error and <1.5 μs wander limits for T-BC operation with dual DSPLL redundancy and automatic free-run/hitless switch. |
| O-RAN Radio Unit (RU) Fronthaul | eCPRI Timing Distribution Node |
Use Scenario: O-RAN compliant RU implementing distributed unit (DU) and radio unit (RU) split, requiring deterministic latency and phase coherence across multiple JESD204B/C lanes. IC Role / Device Role / Timing Role: JESD204B/C clock generator with synchronized DCLK/SYSREF pairs and programmable output delays for lane deskew. Use Value: Achieves deterministic latency ≤10 ns across all 12 outputs, satisfying O-RAN WG4 fronthaul timing specifications for real-time L1 processing. |
Use Scenario: eCPRI gateway or concentrator distributing timing across multiple eCPRI endpoints in virtualized RAN deployments. IC Role / Device Role / Timing Role: eCPRI-compliant jitter attenuator and clock multiplier, locking to SyncE or PTP grandmaster and regenerating low-noise clocks for eCPRI PHY layers. Use Value: Delivers <50 fs jitter and –164 dBc/Hz phase noise to meet eCPRI Class A timing budget for 10+ Gbps optical fronthaul links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar network synchronization clock applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5518D-B15670-GM | 18-output variant with added VCXO phase noise reference and OSYNC for JESD204B/C Subclass 2; higher pin count (80-QFN) | Supports RF card-level jitter attenuation and subclass 2 deterministic latency; requires additional RF board integration | Select when full JESD204B/C Subclass 2 support and VCXO reference capability are required alongside 12+ outputs |
| LMK5B33414RGZT | TI device with 4 DSPLLs, integrated 100 MHz XO, and lower jitter (39 fs); lacks RFPLL and PPSPLL; 48-QFN package | Targets pure Ethernet timing (T-BC/T-TSC) without CPRI/eCPRI RF clock synthesis; no 1PPS/PP2S instant lock | Select for cost-sensitive, non-RF SyncE/PTP-only applications where RFPLL and PPSPLL are unnecessary |
Compared with Si5518D-B15670-GM, SI5512D-B15669-GM reduces pin count and eliminates RF-specific features for digital-board-only deployment; versus LMK5B33414RGZT, it adds RFPLL and PPSPLL but trades off integrated XO and slightly higher jitter for broader 5G fronthaul coverage.
Availability
SI5512D-B15669-GM is available at Aetrix Electronics and suitable for 5G remote radio units, IEEE 1588 boundary clocks, and eCPRI fronthaul systems requiring stable component supply, long-term lifecycle assurance, and O-RAN compliance validation.
Supply support for SI5512D-B15669-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 global semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless infrastructure, automotive, and IoT markets, with design centers in the US, Asia, and Europe.
The SI5512D-B15669-GM belongs to Skyworks' NetSync™ family of jitter-attenuating network synchronizers, engineered specifically for split-architecture 5G RAN systems requiring IEEE 1588, SyncE, and eCPRI timing coexistence on digital PCBs.
FAQ
What is the primary timing architecture implemented in the SI5512D-B15669-GM?
The SI5512D-B15669-GM implements a triple-PLL architecture: one RFPLL for high-frequency CPRI clock synthesis, two independent DSPLLs for Ethernet fronthaul synchronization (supporting T-TSC/T-BC modes), and one PPSPLL optimized for 1PPS/PP2S alignment. This architecture enables concurrent handling of wireless fronthaul, packet-based timing, and pulse-per-second references without cross-domain interference - a core requirement for SI5512D-B15669-GM in O-RAN and massive MIMO systems.
Does the SI5512D-B15669-GM support JESD204B/C Subclass 2 operation?
No, the SI5512D-B15669-GM does not support JESD204B/C Subclass 2. According to Skyworks documentation, it supports Subclass 0 and Subclass 1 only. Subclass 2 functionality-including OSYNC for deterministic latency - is reserved for the 18-output Si5518 variant. The SI5512D-B15669-GM is explicitly designed for digital-board-only deployment where Subclass 1 timing suffices, making this limitation intentional and documented in its data short.
What is the maximum integer output frequency supported by the SI5512D-B15669-GM?
The SI5512D-B15669-GM supports integer output frequencies up to 1.2288 GHz, generated via its RFPLL and integer Q dividers. This capability directly serves CPRI Option 2/3/4 and eCPRI baseband clocking requirements in 5G remote radio heads. The 1.2288 GHz limit applies specifically to integer-mode outputs; fractional outputs are capped at 650 MHz using MultiSynth™ fractional dividers - a confirmed specification in the SI5512D-B15669-GM data short.
How does the SI5512D-B15669-GM handle reference clock failure or loss?
The SI5512D-B15669-GM automatically enters Holdover mode upon input loss-of-signal (LOS) or frequency-out-of-lock (FLOL), sustaining timing accuracy using its internal DCO with drift compensation. It supports automatic Free-Run, Holdover, and Locked states with seamless transitions. Status monitors (LOS, OOF, PHMON, FLOL, PLOL) provide real-time visibility, and the device maintains G.8273.2 T-TSC phase holdover stability - a verified behavior confirmed in SI5512D-B15669-GM compliance reports.
Is AccuTime™ IEEE 1588 software included with the SI5512D-B15669-GM?
No, AccuTime™ IEEE 1588 software is optional and licensed separately. The SI5512D-B15669-GM hardware provides the DCO, status registers, and timing peripherals required to run the AccuTime™ servo algorithm and protocol stack on the host processor, but the software itself is not bundled. Skyworks offers AccuTime™ as a commercial add-on enabling full IEEE 1588v2 implementation - a distinction clearly stated in the SI5512D-B15669-GM data short and product brief.
What package thermal characteristics apply to the SI5512D-B15669-GM?
The SI5512D-B15669-GM uses a 72-QFN package (10×10 mm) with an exposed thermal pad, rated for ambient temperatures from –40 °C to +95 °C and board temperatures up to +105 °C. Thermal resistance (θJA) is 22.5 °C/W per Skyworks characterization, and the land pattern must follow IPC-7351 NSMD guidelines with 0.125 mm stencil thickness for optimal heat dissipation - all specified in the SI5512D-B15669-GM package outline document.
SI5512D-B15669-GM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- NetSync™
- Package/Case:
- 72-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Type:
- Clock Jitter Attenuator
- PLL:
- Yes
- Input:
- CMOS
- Output:
- CML, HCSL, LVCMOS, LVDS, LVPECL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 6:12
- Differential - Input:Output:
- Yes/Yes
- Frequency - Max:
- 650MHz, 1.2288GHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 1.8V, 3.3V
- Operating Temperature:
- -40°C ~ 95°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 72-QFN (10x10)
SI5512D-B15669-GM FAQ
1.How can I place an order for SI5512D-B15669-GM through Aetrix?
Please submit a Request for Quotation (RFQ) for SI5512D-B15669-GM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SI5512D-B15669-GM reliable?
The price and inventory of SI5512D-B15669-GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5512D-B15669-GM is usually 5 days.
3.What payment methods are accepted for SI5512D-B15669-GM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5512D-B15669-GM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI5512D-B15669-GM?
SI5512D-B15669-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI5512D-B15669-GM order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SI5512D-B15669-GM?
For technical support, including SI5512D-B15669-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5512D-B15669-GM requirements.
6.How does Aetrix verify that SI5512D-B15669-GM is sourced from the original manufacturer or authorized distributors?
All SI5512D-B15669-GM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI5512D-B15669-GM meets industry standards.
7.What is the process for return or replacement of SI5512D-B15669-GM?
All SI5512D-B15669-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI5512D-B15669-GM, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SI5512D-B15669-GM part is unused and in its original packaging.
Return procedure for SI5512D-B15669-GM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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