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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Analog Devices Inc. AD9518-3BCPZ-REEL7

Name: AD9518-3BCPZ-REEL7
Brand: Analog Devices Inc.
SKU: AD9518-3BCPZ-REEL7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD9518-3BCPZ-REEL7

Manufacturer:: Analog Devices Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 48-VFQFN Exposed Pad, CSP

Datasheet:: AD9518-3BCPZ-REEL7.pdf

Description:: IC CLOCK GEN 6CH 2GHZ 48LFCSP

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Product details

Overview

AD9518-3BCPZ-REEL7 from Analog Devices is a 6-output, low-jitter clock generator with integrated 1.75–2.25 GHz VCO, three pairs of LVPECL outputs operating up to 1.6 GHz, 225 fs rms additive jitter, and on-chip PLL for high-speed data converter clocking in 10/40/100 GbE line cards.

For engineers reviewing the AD9518-3BCPZ-REEL7 datasheet, AD9518-3BCPZ-REEL7 pinout, AD9518-3BCPZ-REEL7 application, or AD9518-3BCPZ-REEL7 equivalent, key selection criteria include sub-picosecond jitter performance, channel-to-channel skew <10 ps, programmable 1-to-32 output dividers with coarse phase delay, and support for both internal VCO and external VCXO up to 2.4 GHz.

Technical Context

The AD9518-3BCPZ-REEL7 implements a fractional-N PLL architecture with a fully integrated VCO (1.75–2.25 GHz) and dual reference input paths-differential REFIN/REFIN or dual single-ended REF1/REF2-supporting LVPECL, LVDS, or CMOS references up to 250 MHz. Reference monitoring enables automatic revertive switchover and holdover modes.

Each of its three LVPECL output pairs (OUT0/OUT1, OUT2/OUT3, OUT4/OUT5) features an independent 1-to-32 divider with coarse phase delay control, enabling precise timing alignment across channels. Output synchronization occurs automatically at power-up or manually via SYNC pin, ensuring deterministic startup behavior without external calibration.

Key Specifications

Parameter	Value and Actual Design Meaning
VCO Frequency Range	1.75–2.25 GHz - Enables direct synthesis of high-frequency clocks for ADC/DAC sampling and SerDes line rates without external multiplication.
LVPECL Output Max Frequency	1.6 GHz - Supports direct clocking of 10/40/100 GbE PHYs, high-speed ADCs (≥1 GSPS), and FPGA transceivers.
Additive Output Jitter	225 fs rms - Measured distribution-only jitter (VCO bypassed); critical for preserving SNR in high-resolution data converters.
Channel-to-Channel Skew	<10 ps (paired outputs) - Ensures deterministic timing alignment between differential clock pairs driving parallel ADC channels or I/O banks.
Output Divider Range	1 to 32 per pair - Allows flexible frequency scaling and coarse phase adjustment (330–990 ps steps) for deskew and timing margin optimization.
Phase Noise @ 100 kHz offset	−108 dBc/Hz (2 GHz VCO) - Low close-in phase noise essential for minimizing EVM in wireless transceivers and BER degradation in coherent optical systems.
Supply Voltages	VS = 3.3 V ±5%, VS_LVPECL = 2.5–3.3 V, VCP = 3.3–5.0 V - Enables mixed-supply operation: low-noise LVPECL drivers powered separately from core logic.

Pinout & Package

AD9518-3BCPZ-REEL7 is housed in a 48-lead LFCSP (7 mm × 7 mm, 0.5 mm pitch) with exposed paddle for thermal management. Pin functions are validated per Analog Devices AD9518-3 Rev. D datasheet, pages 14–15.

Pin/Terminal	Circuit Role	Design Meaning
REFIN / REFIN	Differential reference input	Accepts LVPECL/LVDS up to 250 MHz; self-biased (1.3–1.75 V common-mode); supports ac/dc coupling.
REF1 / REF2	Single-ended CMOS reference inputs	Two independent inputs with slew rate >50 V/μs; enable dual-reference redundancy or frequency switching.
CLK / CLK	Differential high-frequency clock input	Bypasses VCO for pure distribution; supports up to 2.4 GHz input (e.g., from external VCXO or recovered clock).
OUT0–OUT5	LVPECL clock outputs (3 differential pairs)	Each pair shares a divider; outputs swing 550–980 mV differential into 50 Ω to VS − 2 V.
SYNC	Manual output synchronization trigger	Edge-triggered; forces all output dividers to reset and realign phase simultaneously.
LD / STATUS / REFMON	Status and lock detection outputs	Configurable digital lock detect (DLD) or reference monitor flags; open-drain, 3.3 V tolerant.
SCLK / SDIO / CS	3-wire SPI serial interface	25 MHz max clock rate; supports register read/write for full configuration including divider ratios, phase delays, and switchover modes.

Key Features

Feature	Design Value
Integrated 1.75–2.25 GHz VCO	Eliminates need for external VCO tuning components; reduces board area and phase noise contribution from discrete loop filters.
Three independent 1-to-32 LVPECL output dividers	Enables simultaneous generation of multiple synchronized clock domains (e.g., ADC sample clock, digital core clock, serializer clock) with programmable phase offsets.
Automatic power-up output synchronization	Guarantees deterministic phase relationship across all six outputs at boot-no software initialization required for basic operation.
Reference monitoring with auto switchover/holdover	Ensures continuous clocking during reference failure; holdover stability derived from VCO temperature drift compensation (via internal calibration).
225 fs rms additive jitter (distribution path)	Preserves signal integrity in high-SNR applications like 16-bit+ ADCs; measured with VCO bypassed to isolate distribution-stage contribution.

Applications

10/40/100 GbE Line Cards	High-Speed Data Converter Clocking
Use Scenario: Generating synchronized clocks for OTU3/OTU4 framers, FEC engines, and SerDes PHYs in telecom line cards. IC Role / Device Role / Timing Role: Primary clock generator providing low-jitter reference to multiple ASICs and FPGAs, with automatic failover between primary and backup reference clocks. Use Value: Sub-10 ps channel skew ensures deterministic inter-chip timing alignment; −126 dBc/Hz phase noise at 1 MHz offset minimizes BER floor in coherent optical receivers.	Use Scenario: Driving multi-GSPS ADCs and DACs in radar, spectrum analyzers, and software-defined radios. IC Role / Device Role / Timing Role: Jitter-cleaned sampling clock source with additive jitter ≤225 fs rms, directly feeding converter sampling inputs while suppressing reference-induced spurs. Use Value: Enables >75 dBFS SNR in 14-bit ADCs at 1 GSPS; programmable coarse phase delay allows fine-tuning of aperture uncertainty relative to analog signal path.
Wireless Transceiver Timing	ATE Instrumentation Clock Distribution
Use Scenario: Providing phase-aligned local oscillator (LO) and baseband clocks in massive MIMO and 5G NR RF front-ends. IC Role / Device Role / Timing Role: Multi-output clock synthesizer generating LO synthesis clocks (via integer-N division) and digital processing clocks from a single stable reference. Use Value: −104 dBc/Hz phase noise at 100 kHz offset (2 GHz VCO) suppresses reciprocal mixing; automatic synchronization maintains phase coherence across TX/RX chains.	Use Scenario: Distributing ultra-low-jitter clocks to multiple DUT sites, digitizers, and pattern generators in automated test equipment. IC Role / Device Role / Timing Role: Central jitter-attenuating clock hub accepting a master reference and delivering six independently configurable outputs with matched propagation delay. Use Value: 40 ps max skew across all outputs enables tight timing margins in multi-site parallel testing; 25 MHz SPI interface allows dynamic reconfiguration during test sequences.

10/40/100 GbE Line Cards

High-Speed Data Converter Clocking

Use Scenario: Generating synchronized clocks for OTU3/OTU4 framers, FEC engines, and SerDes PHYs in telecom line cards.

IC Role / Device Role / Timing Role: Primary clock generator providing low-jitter reference to multiple ASICs and FPGAs, with automatic failover between primary and backup reference clocks.

Use Value: Sub-10 ps channel skew ensures deterministic inter-chip timing alignment; −126 dBc/Hz phase noise at 1 MHz offset minimizes BER floor in coherent optical receivers.

Use Scenario: Driving multi-GSPS ADCs and DACs in radar, spectrum analyzers, and software-defined radios.

IC Role / Device Role / Timing Role: Jitter-cleaned sampling clock source with additive jitter ≤225 fs rms, directly feeding converter sampling inputs while suppressing reference-induced spurs.

Use Value: Enables >75 dBFS SNR in 14-bit ADCs at 1 GSPS; programmable coarse phase delay allows fine-tuning of aperture uncertainty relative to analog signal path.

Wireless Transceiver Timing

ATE Instrumentation Clock Distribution

Use Scenario: Providing phase-aligned local oscillator (LO) and baseband clocks in massive MIMO and 5G NR RF front-ends.

IC Role / Device Role / Timing Role: Multi-output clock synthesizer generating LO synthesis clocks (via integer-N division) and digital processing clocks from a single stable reference.

Use Value: −104 dBc/Hz phase noise at 100 kHz offset (2 GHz VCO) suppresses reciprocal mixing; automatic synchronization maintains phase coherence across TX/RX chains.

Use Scenario: Distributing ultra-low-jitter clocks to multiple DUT sites, digitizers, and pattern generators in automated test equipment.

IC Role / Device Role / Timing Role: Central jitter-attenuating clock hub accepting a master reference and delivering six independently configurable outputs with matched propagation delay.

Use Value: 40 ps max skew across all outputs enables tight timing margins in multi-site parallel testing; 25 MHz SPI interface allows dynamic reconfiguration during test sequences.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock generation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD9520-0	Includes crystal oscillator input, EEPROM for auto-configuration, and 10 outputs (LVPECL + CMOS); no integrated VCO (requires external VCXO).	Better suited for systems needing zero-delay startup, crystal-referenced stability, or more output formats-e.g., mixed-signal ATE with legacy CMOS logic.	Select AD9520-0 when EEPROM-based configuration persistence or crystal reference integration is required; AD9518-3BCPZ-REEL7 is preferred for VCO-integrated simplicity and lower jitter in VCO-based synthesis.
AD9517-3BCPZ-REEL7	Nearly identical architecture but with four LVPECL outputs (2 pairs) plus two 800 MHz CMOS outputs; same VCO range and jitter specs.	Optimized for designs requiring fewer high-speed outputs plus general-purpose CMOS clocks-e.g., FPGA-based prototyping platforms with mixed I/O standards.	Choose AD9517-3BCPZ-REEL7 if only four LVPECL outputs are needed and CMOS clocks are required; AD9518-3BCPZ-REEL7 delivers higher output count for dense multi-ASIC clock trees.

Compared with AD9520-0 and AD9517-3BCPZ-REEL7, the AD9518-3BCPZ-REEL7 uniquely balances six dedicated LVPECL outputs, integrated VCO, and lowest additive jitter-making it optimal for high-channel-count, jitter-critical clock distribution where external VCO complexity must be avoided.

Availability

AD9518-3BCPZ-REEL7 is available at Aetrix Electronics and suitable for 10/40/100 GbE line cards, high-speed data converter systems, and wireless transceiver timing applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD9518-3BCPZ-REEL7 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and a 50+ year heritage in precision timing and RF solutions.

The AD9518 family was engineered specifically for sub-picosecond jitter clock distribution in high-speed communications and instrumentation-emphasizing phase noise optimization, deterministic synchronization, and robust reference management in harsh thermal environments.

FAQ

What is the maximum operating frequency of the LVPECL outputs on the AD9518-3BCPZ-REEL7?

The AD9518-3BCPZ-REEL7 supports LVPECL output frequencies up to 1.6 GHz per pair, verified under typical conditions (VS_LVPECL = 3.3 V, TA = 25°C). This capability enables direct clocking of 10/40/100 GbE SerDes, high-speed ADCs, and FPGA transceivers without external frequency multiplication. Performance remains within specification across the industrial temperature range (−40°C to +85°C).

Does the AD9518-3BCPZ-REEL7 support external VCOs, and what is the maximum frequency?

Yes, the AD9518-3BCPZ-REEL7 supports optional external VCOs or VCXOs up to 2.4 GHz via the CLK input path, as confirmed in the Rev. D datasheet (page 1). When using an external source, the internal VCO is disabled, and the device operates in clock cleanup or distribution mode-enabling use with ultra-low-phase-noise OCXOs or custom VCOs for specialized spectral purity requirements.

How many output pairs does the AD9518-3BCPZ-REEL7 have, and what divider range is supported per pair?

The AD9518-3BCPZ-REEL7 provides three independent LVPECL output pairs (OUT0/OUT1, OUT2/OUT3, OUT4/OUT5), each with a dedicated 1-to-32 integer divider and coarse phase delay control (330–990 ps in 110 ps steps). This architecture allows precise frequency scaling and deskew across multiple clock domains-critical for multi-channel ADCs, beamforming arrays, and parallel SerDes lanes.

What is the additive jitter specification for the AD9518-3BCPZ-REEL7, and under what conditions is it measured?

The AD9518-3BCPZ-REEL7 achieves 225 fs rms additive jitter (distribution path only), measured with the internal VCO bypassed and a clean 1 GHz input clock driving a 1 GHz LVPECL output (Table 11, Rev. D datasheet). This value isolates jitter contributed solely by the clock distribution circuitry-excluding PLL and VCO contributions-and is critical for evaluating SNR impact in high-resolution data converters.

Is the AD9518-3BCPZ-REEL7 pin-compatible with other members of the AD9518 family, such as the AD9518-0 or AD9518-1?

No, the AD9518-3BCPZ-REEL7 is not pin-compatible with AD9518-0 or AD9518-1. While all share the same 48-lead LFCSP package and core architecture, the AD9518-3 variant is specifically configured for three LVPECL output pairs with 1.6 GHz max frequency and optimized PLL/VCO settings. Differences in internal divider mapping, default register states, and output driver configurations prevent drop-in replacement without firmware and layout validation.

AD9518-3BCPZ-REEL7 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: *

Package/Case:: 48-VFQFN Exposed Pad, CSP

Packaging:: Bulk

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Clock Generator, Fanout Distribution

PLL:: Yes

Input:: CMOS, LVDS, LVPECL

Output:: LVPECL

Number of Circuits:: -

Ratio - Input:Output:: 1:6

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 2.25GHz

Divider/Multiplier:: Yes/No

Voltage - Supply:: 3.135V ~ 3.465V

Operating Temperature:: -

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 48-LFCSP-VQ (7x7)

AD9518-3BCPZ-REEL7 FAQ

1.How can I place an order for AD9518-3BCPZ-REEL7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AD9518-3BCPZ-REEL7 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 AD9518-3BCPZ-REEL7 reliable?

The price and inventory of AD9518-3BCPZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9518-3BCPZ-REEL7 is usually 5 days.

3.What payment methods are accepted for AD9518-3BCPZ-REEL7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9518-3BCPZ-REEL7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD9518-3BCPZ-REEL7?

AD9518-3BCPZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD9518-3BCPZ-REEL7 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 AD9518-3BCPZ-REEL7?

For technical support, including AD9518-3BCPZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9518-3BCPZ-REEL7 requirements.

6.How does Aetrix verify that AD9518-3BCPZ-REEL7 is sourced from the original manufacturer or authorized distributors?

All AD9518-3BCPZ-REEL7 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 AD9518-3BCPZ-REEL7 meets industry standards.

7.What is the process for return or replacement of AD9518-3BCPZ-REEL7?

All AD9518-3BCPZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD9518-3BCPZ-REEL7, 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 AD9518-3BCPZ-REEL7 part is unused and in its original packaging.

Return procedure for AD9518-3BCPZ-REEL7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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