Analog Devices Inc. AD9518-0ABCPZ

Overview

AD9518-0ABCPZ from Analog Devices is a 6-output, low-jitter clock generator with integrated 2.55–2.95 GHz VCO, three LVPECL output pairs operating up to 1.6 GHz, 225 fs rms additive jitter, and channel-to-channel skew <10 ps. It serves as a high-precision clock distribution and synthesis IC in high-speed data converter timing systems.

For engineers reviewing the AD9518-0ABCPZ datasheet, AD9518-0ABCPZ pinout, AD9518-0ABCPZ application, or AD9518-0ABCPZ equivalent, key selection criteria include internal VCO frequency range, LVPECL output divider programmability (1–32), phase delay per pair, power supply flexibility (3.3 V core, 2.5–3.3 V LVPECL, up to 5 V charge pump), and industrial temperature operation (−40°C to +85°C).

Technical Context

The AD9518-0ABCPZ implements a PLL-based architecture with an on-chip VCO tunable from 2.55 GHz to 2.95 GHz and optional external VCO/VCXO support up to 2.4 GHz. Its PFD accepts reference inputs up to 250 MHz (LVPECL/LVDS/CMOS) and supports automatic/manual reference switchover with lock detect.

Each of its three LVPECL output pairs features independent 1-to-32 integer dividers with coarse phase delay control, enabling precise timing alignment. Output synchronization is supported both automatically at power-up and manually via serial command, ensuring deterministic startup behavior across all six outputs.

Key Specifications

Pinout & Package

AD9518-0ABCPZ is housed in a 48-lead Lead Frame Chip Scale Package (LFCSP) with exposed thermal pad, optimized for low-inductance grounding and thermal dissipation in high-frequency clock applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9518-0ABCPZ, AD9516-0BCPZ trades integrated VCO for greater external VCO flexibility, while AD9520-0BCPZ adds nonvolatile configuration and extra outputs at the cost of larger footprint and higher complexity - AD9518-0ABCPZ remains optimal for compact, self-contained, high-performance clock synthesis with minimal external components.

Availability

AD9518-0ABCPZ is available at Aetrix Electronics and suitable for 10/40/100 GbE networking line cards, high-speed data converter timing, wireless transceiver LO synthesis, and ATE instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for AD9518-0ABCPZ 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 and manufacturing expertise spanning precision timing, RF, and data conversion.

The AD9518 product line delivers ultra-low-jitter clock generation and distribution ICs specifically engineered for demanding applications in communications infrastructure, test equipment, and high-speed data acquisition where phase noise and timing accuracy are critical.

FAQ

What is the maximum operating frequency of the AD9518-0ABCPZ's internal VCO?

The AD9518-0ABCPZ's internal VCO tunes from 2.55 GHz to 2.95 GHz, as specified in the Rev. D datasheet under PLL Characteristics. This range supports direct synthesis of common high-speed clock frequencies used in 100 GbE, ADC sampling, and wireless LO generation without requiring external VCO components. Operation outside this band is not guaranteed and may result in degraded phase noise or lock failure.

Does the AD9518-0ABCPZ support both differential and single-ended reference inputs?

Yes, the AD9518-0ABCPZ supports two reference input configurations: a differential pair (REFIN/REFIN) accepting LVPECL or LVDS signals up to 250 MHz, and dual single-ended CMOS-compatible inputs (REF1/REF2) with logic thresholds at 0.8 V and 2.0 V. Both modes include reference monitoring and switchover capability, allowing flexible integration into systems with diverse clock source architectures.

How many LVPECL outputs does the AD9518-0ABCPZ provide, and what is their maximum frequency?

The AD9518-0ABCPZ provides six LVPECL outputs arranged in three differential pairs (OUT0/OUT1, OUT2/OUT3, OUT4/OUT5), each capable of operating up to 1.6 GHz when configured for direct output (bypassing internal dividers). Each pair shares a programmable 1-to-32 divider with coarse phase delay, enabling frequency translation and alignment within the same pair.

What is the typical additive jitter performance of the AD9518-0ABCPZ in clock distribution mode?

In clock distribution mode (VCO divider bypassed), the AD9518-0ABCPZ achieves 225 fs rms additive jitter, measured as time jitter integrated from 12 kHz to 20 MHz. This value reflects jitter added solely by the distribution path - excluding PLL and VCO contributions - making it ideal for cleaning noisy references or distributing ultra-stable clocks with minimal degradation.

Is the AD9518-0ABCPZ pin-compatible with other members of the AD9518 family, such as AD9518-1 or AD9518-2?

No, the AD9518-0ABCPZ is not pin-compatible with AD9518-1ABCPZ or AD9518-2ABCPZ. While all share the same 48-lead LFCSP package and pinout, differences in internal divider configurations, output enable logic, and default power-on states require verification of register initialization and functional validation per variant. The datasheet explicitly states that "AD9518-0" refers only to that specific member of the family.