Analog Devices Inc. AD9520-5BCPZ-REEL7

Overview

AD9520-5BCPZ-REEL7 from Analog Devices is a 12-output LVPECL/24-output CMOS clock generator with integrated PLL, supporting up to 2.4 GHz external VCO/VCXO and delivering sub-picosecond jitter performance. It features four independent output groups (3 outputs per group), each with programmable 1-to-32 dividers and phase delay, and operates from a single 3.3 V supply with separate 2.375–3.465 V output driver rail. It is used in high-speed data converter clocking and Synchronous Ethernet timing systems.

For engineers reviewing the AD9520-5BCPZ-REEL7 datasheet, AD9520-5BCPZ-REEL7 pinout, AD9520-5BCPZ-REEL7 application, or AD9520-5BCPZ-REEL7 equivalent, this page provides verified specifications including additive jitter (225 fs rms), channel skew (<16 ps grouped), LVPECL output frequency (up to 1.6 GHz), CMOS reconfiguration capability (≤250 MHz), and SPI/I²C serial control - all confirmed for the AD9520-5BCPZ-REEL7 variant.

Technical Context

The AD9520-5BCPZ-REEL7 integrates a low-noise PLL core with user-selectable PFD frequencies (100 MHz max), programmable charge pump current (0.6–4.8 mA), and configurable N/R divider delays (365–1101 ps). Its reference input accepts differential LVPECL/LVDS or single-ended CMOS signals up to 250 MHz, or a 16.62–33.33 MHz crystal.

Each of the four output groups includes a dedicated 1-to-32 divider with coarse phase offset control, enabling deterministic skew management. Output drivers support LVPECL (1.6 GHz) or reconfigurable CMOS (250 MHz), with automatic power-up synchronization and manual sync capability via SYNC pin.

Key Specifications

Pinout & Package

AD9520-5BCPZ-REEL7 is housed in a 64-lead LFCSP (Lead Frame Chip Scale Package) with exposed thermal pad, 9 mm × 9 mm footprint, and 0.5 mm pitch. Pin functions are defined per Analog Devices' official pin configuration diagram (Rev. C, p.15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9520-5BCPZ-REEL7, AD9522-5BCPZ-REEL7 offers identical timing performance but with LVDS output drivers instead of LVPECL, while LMK04832ISQE/NOPB provides integrated VCO and JESD204B support at the cost of higher power and different register mapping - making AD9520-5BCPZ-REEL7 optimal for legacy LVPECL infrastructure and crystal-referenced precision timing.

Availability

AD9520-5BCPZ-REEL7 is available at Aetrix Electronics and suitable for high-speed data converter clocking, Synchronous Ethernet timing, and SONET/OTN line card applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD9520-5BCPZ-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, founded in 1965 and headquartered in Wilmington, MA.

The AD9520 family is designed for ultra-low-jitter clock generation and distribution in communications infrastructure, test equipment, and high-speed data acquisition - with AD9520-5BCPZ-REEL7 optimized for 2.4 GHz VCO interfacing and multi-group deterministic skew control.

FAQ

What is the maximum LVPECL output frequency supported by the AD9520-5BCPZ-REEL7?

The AD9520-5BCPZ-REEL7 supports LVPECL output frequencies up to 1.6 GHz in direct-to-output mode. This limit is constrained by the internal CLK input path bandwidth and is verified in the datasheet (Table 4, "LVPECL CLOCK OUTPUTS"). Operation above 1.6 GHz is possible but violates the VOD specification and degrades jitter performance. The AD9520-5BCPZ-REEL7 achieves this using its 2.4 GHz-capable differential CLK input and internal distribution path, not via internal multiplication.

Does the AD9520-5BCPZ-REEL7 support crystal reference input?

Yes, the AD9520-5BCPZ-REEL7 supports direct connection of a parallel-resonant fundamental-mode crystal in the 16.62 MHz to 33.33 MHz range. The crystal is connected between REFIN and REFIN pins, with specified maximum motional resistance of 30 Ω. This configuration bypasses external buffer circuitry and enables standalone, low-phase-noise reference generation - a key capability confirmed in the General Description and Table 2 of the AD9520-5BCPZ-REEL7 datasheet.

Can the AD9520-5BCPZ-REEL7 generate both LVPECL and CMOS outputs simultaneously?

Yes, the AD9520-5BCPZ-REEL7 can operate LVPECL and CMOS outputs concurrently. Each of the 12 LVPECL outputs (OUT0–OUT11) may be independently reconfigured as two CMOS outputs (e.g., OUT0A/OUT0B) for frequencies ≤250 MHz, while other outputs remain active as LVPECL. This mixed-mode operation is fully supported in hardware and register-controlled - enabling flexible clock tree design without external level translation, as documented in the Functional Block Diagram and Applications Information sections.

What is the additive jitter performance of the AD9520-5BCPZ-REEL7 in distribution-only mode?

In distribution-only mode (VCO divider bypassed), the AD9520-5BCPZ-REEL7 achieves as low as 225 fs rms additive output jitter, measured at the LVPECL outputs. This value is specified in the Features section and confirmed in Table 8 ("CLOCK OUTPUT ADDITIVE TIME JITTER (VCO DIVIDER NOT USED)") for conditions including fCLK = 622.08 MHz, fOUT = 622.08 MHz, and divide ratio = 1. The jitter is measured using the SNR-of-ADC method over a 12 kHz–20 MHz integration bandwidth.

How does the AD9520-5BCPZ-REEL7 handle reference failure and recovery?

The AD9520-5BCPZ-REEL7 implements automatic reference holdover and revertive switchover with glitch-free transition between references. Upon loss of primary reference, it enters holdover using internal timing stability; upon return, it seamlessly reacquires lock without disrupting outputs. Recovery from holdover is automatic and deterministic, with no software intervention required - a behavior explicitly detailed in the Features list and Operational Configurations section of the AD9520-5BCPZ-REEL7 datasheet.