Analog Devices Inc. AD9517-2ABCPZ-RL7

Overview

AD9517-2ABCPZ-RL7 from Analog Devices is a 12-output clock generator with integrated 2.2 GHz VCO, delivering subpicosecond jitter performance for high-speed data converter timing. It features four 1.6 GHz LVPECL outputs (in two pairs), four 800 MHz LVDS outputs (in two pairs, each reconfigurable as dual 250 MHz CMOS), programmable dividers (1–32 for LVPECL; up to 1024 for LVDS/CMOS), and fine delay adjustment on all LVDS outputs. It is used in 10/40/100 GbE line cards and high-performance ADC/DAC clocking.

For engineers reviewing the AD9517-2ABCPZ-RL7 datasheet, AD9517-2ABCPZ-RL7 pinout, AD9517-2ABCPZ-RL7 application, or AD9517-2ABCPZ-RL7 equivalent, key selection criteria include additive output jitter (225 fs rms LVPECL, 275 fs rms LVDS), channel-to-channel skew (<10 ps for paired LVPECL), VCO tuning range (2.05–2.33 GHz), reference input flexibility (LVPECL/LVDS/CMOS up to 250 MHz), and automatic power-up synchronization of all outputs.

Technical Context

The AD9517-2ABCPZ-RL7 integrates a low-noise PLL with an on-chip VCO (2.05–2.33 GHz) and supports optional external VCO/VCXO up to 2.4 GHz. Its phase-frequency detector operates at up to 100 MHz (with selectable antibacklash pulse widths of 1.3 ns, 2.9 ns, or 6.0 ns), and charge pump current is programmable (0.6 mA or 4.8 mA) via CPRSET resistor.

Each LVPECL output pair shares a 1-to-32 divider with coarse phase delay; each LVDS output pair uses two cascaded 1-to-32 dividers and supports fine Δt delay adjustment. All outputs synchronize automatically at power-up, and manual sync is supported via the SYNC pin.

Key Specifications

Pinout & Package

AD9517-2ABCPZ-RL7 is housed in a 48-lead LFCSP (7 mm × 7 mm, 0.25 mm pitch) with exposed paddle for thermal management. Pin functions are defined per Analog Devices' AD9517-2 Rev. F datasheet, Page 18 (Pin Configuration and Function Descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9517-2ABCPZ-RL7, the AD9517-1ABCPZ-RL7 trades 1.6 GHz LVPECL capability and higher VCO frequency for improved close-in phase noise at 2.0 GHz, while the AD9523-1BCPZ-REEL7 replaces the VCO with crystal-referenced precision and adds EEPROM-based auto-configuration-making it preferable for systems requiring guaranteed startup state but less suitable for agile frequency synthesis.

Availability

AD9517-2ABCPZ-RL7 is available at Aetrix Electronics and suitable for 10/40/100 GbE networking line cards, high-speed data converter timing, and ATE instrumentation requiring stable component supply across extended temperature ranges (−40°C to +85°C) and long production lifecycles.

Supply support for AD9517-2ABCPZ-RL7 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 AD9517 family is designed specifically for ultra-low-jitter clock generation and distribution in high-speed communications and precision data acquisition systems, emphasizing phase noise, additive jitter, and deterministic synchronization.

FAQ

What is the maximum operating frequency of the LVPECL outputs on the AD9517-2ABCPZ-RL7?

The AD9517-2ABCPZ-RL7 supports LVPECL outputs up to 1.6 GHz. This is verified in the "CLOCK OUTPUTS" section of the Rev. F datasheet (Page 6, Table 4), where the maximum specified frequency is 1.6 GHz for distribution-only mode (VCO divider bypassed). Operation beyond this frequency is possible but does not guarantee compliance with differential voltage (VOD) or jitter specifications.

Does the AD9517-2ABCPZ-RL7 include an integrated VCO, and what is its tuning range?

Yes, the AD9517-2ABCPZ-RL7 includes an integrated VCO with a tuning range of 2.05 GHz to 2.33 GHz, as confirmed in the General Description (Page 1) and Specifications (Page 4, Table 2). This on-chip VCO eliminates the need for external tuning components and supports direct synthesis of high-frequency clocks for SerDes and RF sampling applications.

Can the LVDS outputs of the AD9517-2ABCPZ-RL7 be reconfigured as CMOS outputs?

Yes, each of the four LVDS outputs (OUT4–OUT7) on the AD9517-2ABCPZ-RL7 can be individually reconfigured as two single-ended 250 MHz CMOS outputs, yielding up to eight additional CMOS clocks. This capability is explicitly stated in the General Description (Page 1) and detailed in the "CLOCK OUTPUTS" section (Page 7, CMOS CLOCK OUTPUTS table).

What is the additive output jitter specification for the LVPECL and LVDS outputs of the AD9517-2ABCPZ-RL7?

The AD9517-2ABCPZ-RL7 specifies 225 fs rms additive output jitter for LVPECL outputs and 275 fs rms for LVDS outputs, measured under distribution-only conditions (VCO divider not used). These values are documented in the "FEATURES" section (Page 1) and confirmed in the "CLOCK OUTPUT ADDITIVE PHASE NOISE" table (Page 9, Table 6) of the Rev. F datasheet.

How does the AD9517-2ABCPZ-RL7 handle reference input switchover and holdover?

The AD9517-2ABCPZ-RL7 supports both automatic revertive and manual reference switchover/holdover modes, with reference monitoring capability. These functions are implemented via internal status logic and configurable registers (e.g., Register 0x018 bits[4:0]), enabling seamless failover between REFIN and REF1/REF2 inputs during loss-of-signal events-critical for telecom and infrastructure applications requiring high availability.