Analog Devices Inc. AD9518-3BCPZ

Overview

AD9518-3BCPZ from Analog Devices is a 6-output clock generator IC with integrated 1.75–2.25 GHz VCO, delivering sub-picosecond jitter performance for high-speed data converter clocking. It features three LVPECL output pairs (OUT0/OUT1, OUT2/OUT3, OUT4/OUT5), each with independent 1-to-32 programmable dividers and coarse phase delay, operating up to 1.6 GHz. Designed for low-phase-noise clock distribution in 10/40/100 GbE line cards and high-performance ADC/DAC systems.

For engineers reviewing the AD9518-3BCPZ datasheet, AD9518-3BCPZ pinout, AD9518-3BCPZ application, or AD9518-3BCPZ equivalent, key selection criteria include additive jitter (225 fs rms), channel-to-channel skew (<10 ps), on-chip VCO tuning range, LVPECL output voltage compliance (2.5–3.3 V), and industrial temperature operation (−40°C to +85°C).

Technical Context

The AD9518-3BCPZ implements a PLL-based clock generation architecture with a fully integrated VCO (1.75–2.25 GHz) and optional external VCO/VCXO support up to 2.4 GHz. Its phase-frequency detector (PFD) supports programmable antibacklash pulse widths (1.3/2.9/6.0 ns) and digital lock detect with configurable window thresholds.

Each of the three LVPECL output pairs includes a dedicated divider with coarse phase delay control and operates with ≤15 ps skew within the pair. The device supports dual reference inputs (differential REFIN/REFIN or single-ended REF1/REF2), automatic reference switchover, and serial SPI control via SDIO/SCLK/CS pins.

Key Specifications

Pinout & Package

The AD9518-3BCPZ is housed in a 48-lead LFCSP (CP-48-9) package with exposed paddle for thermal dissipation. Pin functions are defined per Analog Devices Rev. D datasheet (Pages 14–15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9516-3BCPZ and AD9520-0, the AD9518-3BCPZ uniquely balances six LVPECL outputs, integrated VCO, and sub-10 ps intra-pair skew-making it optimal for multi-lane high-speed data acquisition where phase determinism and synthesis flexibility are co-required.

Availability

AD9518-3BCPZ is available at Aetrix Electronics and suitable for 10/40/100 GbE networking, high-speed data converter clocking, and ATE instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD9518-3BCPZ 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.

The AD9518 product line delivers ultra-low-jitter clock distribution and synthesis for demanding data converter and high-speed serial interface applications, emphasizing phase noise minimization and deterministic output alignment.

FAQ

What is the maximum supported input frequency for the AD9518-3BCPZ reference inputs?

The AD9518-3BCPZ accepts differential reference inputs (REFIN/REFIN) up to 250 MHz and single-ended CMOS inputs (REF1/REF2) up to 250 MHz with slew rate >50 V/μs. For high-frequency clock inputs directly to the CLK/CLK pins, the device supports up to 2.4 GHz when bypassing the VCO divider for clock cleanup applications. All specifications are validated per Rev. D datasheet Table 3.

Does the AD9518-3BCPZ support automatic synchronization of all outputs after power-up?

Yes, the AD9518-3BCPZ performs automatic synchronization of all six LVPECL outputs on power-up, ensuring deterministic phase alignment without external reset sequencing. This behavior is enabled by default and can be confirmed in the "Automatic Synchronization" section (Page 34) and register 0x000 bit[0] (SYNC_EN) of the AD9518-3BCPZ datasheet Rev. D.

What is the typical additive jitter performance of the AD9518-3BCPZ in clock distribution mode?

The AD9518-3BCPZ achieves 225 fs rms additive output jitter in distribution-only mode (VCO divider bypassed), measured with a clean 1 GHz input and 1 GHz output. This value excludes PLL and VCO contributions and reflects pure distribution path performance, as specified in Table 6 (Rev. D, Page 7). It enables high-SNR operation in precision ADC/DAC systems.

Can the AD9518-3BCPZ operate with an external VCO or VCXO?

Yes, the AD9518-3BCPZ supports optional external VCO or VCXO operation up to 2.4 GHz via the CLK input path, while retaining full PLL functionality. When using an external source, the internal VCO is disabled, and the charge pump supply (VCP) may be set to 5 V to accommodate extended tuning voltage ranges. Configuration details are in the "External VCO/VCXO" section (Page 1) and Figure 1.

What package type and thermal characteristics does the AD9518-3BCPZ use?

The AD9518-3BCPZ uses a 48-lead LFCSP package (CP-48-9, 7 mm × 7 mm) with exposed paddle for enhanced thermal dissipation. Its thermal resistance θJA is 32.5°C/W (Rev. D, Page 13), and it is rated for continuous operation from −40°C to +85°C. The exposed paddle must be soldered to a thermal pad on the PCB for reliable performance under full load.